Having access to high speed diving without the use of mechanical science and discovery centers have been
considered. Production of simple, yet effective tool to reduce energy consumption and associated diver is
very valuable. Assistant diver device that works with human muscle power, includes a pair of ballets. This
system reduces the energy required to dive to less than half as the speed increases to 2 to 5 knot. Using
numerical methods can answer a lot of questions and a simulation of the dynamic behavior of the device. In
this article, modeling of fluid flow around the Diver helper of FLUENT software and using Dynamic Mesh
have been done.
Flow lines show an increase in the angle of the fins and causes development of vortices behind them.
Pressure Cantor can also be used in the analysis of the fins. The drag coefficient ballet based on the device
at various angles in a period is reported in charts.
The need for high pump performance and efficiency continue to encourage the study of flow between two parallel co-rotating discs in multiple discs pump or turbine. Therefore, this study entails the design, construction and CFD simulation of a 3D Tesla pump model axisymmetric swirling flow in order to enhance the understanding of Tesla pump for future development.
Method of solution entails designing and construction of a small prototype tesla pump and then using the design geometry and parameters to design and perform numerical simulation. The results of the numerical simulation were then analyzed.
The result obtained indicates static pressure to have minimum value of -4.7791Pa at the outlet and 13.777Pa at the pump inlet and with velocity magnitude having minimum velocity of 0.00m/s and maximum velocity of 4.12m/s. The strength of the velocity was seen to be very high at the pump outlet. The analysis radial velocity showed minimum value of -0.508m/s and maximum value of 3.981m/s with the radial velocity vector being concentrated at the discs periphery and outlet.
Model simulation results exhibited smooth pressure and velocity profiles. With the 3D simulation all flow variables are able to be predicted.
Flight Dynamics and Numerical Analysis of an Unmanned Aerial Vehicle (UAV)Designage Solutions
Next part of "A Review of Flight Dynamics and Numerical Analysis of an Unmanned Aerial Vehicle (UAV)" with case studies.
Find previous presentation here- http://www.slideshare.net/HarshadaGurav/a-review-of-flight-dynamics-and-numerical-analysis-of-an-unmanned-aerial-vehicle-uav
Analysis of Headway in Traffic Streams on the Minor Leg of an IntersectionIOSR Journals
An increase in the number of road users and pedestrians lead to increasing demand on the facilities
and eventual inconvenience and delays. This study evaluated the response time of drivers on the minor leg of the
Challenge Intersection in Ilorin because of the significance of the minor traffic stream on the capacity analysis
or design of traffic merging at the major leg.The method employed was basically manual whereby stopwatches
were used to measure the response time of drivers. The response time of each driver in a traffic stream was
taken in relation to theirrespective positions in the queue from which the headways were calculated.The
headway for a car to stop is more than the headway to move as indicated in tables 1.0 and 1.1. The mean and
the standard deviation for the headway to stop and move were also determined.
Flower Pollination for Rotary Inverted Pendulum Stabilization with DelayTELKOMNIKA JOURNAL
Flower pollination is a single objective optimization technique which as a unconstrained
optimization method is applied for the stabilization of the rotary inverted pendulum system. It was observed
that the flower pollination method gave better sensitivity in control of the pendulum about its upright
unstable equilibrium position with less time and definitely indicated that the method is an energy efficient
method when compared with other methods like direct pole placement. This method yielded results under
the influence of time delay and have proven that the influence of time delay is significantly felt and would
cause loss of energy, however the presence of flower pollination for optimization minimizes the loss
incurred due to time delay and makes the system significant in terms of sensitivity.
Evaluation of Over-speed, Burst Margin and Estimation of Low-cycle Fatigue Li...AM Publications
Aero engine rotor burst evaluation is one of the most important problems to be taken care off, whenever it comes to designing a turbo machinery disc. The consequences of a fiasco can be intense, since the disc disintegrates into multiple pieces and they are hurled away in all the possible direction at high speeds. Due to high thermo-mechanical loading conditions the disc is subjected to varying degrees of temperature from bore to rim. However, the centrifugal force dominates in the disc which ranges from 85%-90% and the rest can be treated as thermal and gas loads. The challenge lies at designing a disc for off design conditions with their varying loads and duty cycles. In present work evaluation of safety margins and low-cycle fatigue (LCF) estimation of an aero engine disc through classical methods and blending the terminologies with simulation engineering to arrive at a probable interpretation of number of duty cycles is carried out. The methodology compares the fatigue parameters involved in evaluation of disc life. The design tool closely connects the flight certification requirement, namely Flight Readiness Certification, Federal Aviation Administration and European Aviation Safety Agency the regulating agencies for safety in air transportation vehicles. Speed regulations through API and MIL handbook for material specification using finite element analysis approach.
The need for high pump performance and efficiency continue to encourage the study of flow between two parallel co-rotating discs in multiple discs pump or turbine. Therefore, this study entails the design, construction and CFD simulation of a 3D Tesla pump model axisymmetric swirling flow in order to enhance the understanding of Tesla pump for future development.
Method of solution entails designing and construction of a small prototype tesla pump and then using the design geometry and parameters to design and perform numerical simulation. The results of the numerical simulation were then analyzed.
The result obtained indicates static pressure to have minimum value of -4.7791Pa at the outlet and 13.777Pa at the pump inlet and with velocity magnitude having minimum velocity of 0.00m/s and maximum velocity of 4.12m/s. The strength of the velocity was seen to be very high at the pump outlet. The analysis radial velocity showed minimum value of -0.508m/s and maximum value of 3.981m/s with the radial velocity vector being concentrated at the discs periphery and outlet.
Model simulation results exhibited smooth pressure and velocity profiles. With the 3D simulation all flow variables are able to be predicted.
Flight Dynamics and Numerical Analysis of an Unmanned Aerial Vehicle (UAV)Designage Solutions
Next part of "A Review of Flight Dynamics and Numerical Analysis of an Unmanned Aerial Vehicle (UAV)" with case studies.
Find previous presentation here- http://www.slideshare.net/HarshadaGurav/a-review-of-flight-dynamics-and-numerical-analysis-of-an-unmanned-aerial-vehicle-uav
Analysis of Headway in Traffic Streams on the Minor Leg of an IntersectionIOSR Journals
An increase in the number of road users and pedestrians lead to increasing demand on the facilities
and eventual inconvenience and delays. This study evaluated the response time of drivers on the minor leg of the
Challenge Intersection in Ilorin because of the significance of the minor traffic stream on the capacity analysis
or design of traffic merging at the major leg.The method employed was basically manual whereby stopwatches
were used to measure the response time of drivers. The response time of each driver in a traffic stream was
taken in relation to theirrespective positions in the queue from which the headways were calculated.The
headway for a car to stop is more than the headway to move as indicated in tables 1.0 and 1.1. The mean and
the standard deviation for the headway to stop and move were also determined.
Flower Pollination for Rotary Inverted Pendulum Stabilization with DelayTELKOMNIKA JOURNAL
Flower pollination is a single objective optimization technique which as a unconstrained
optimization method is applied for the stabilization of the rotary inverted pendulum system. It was observed
that the flower pollination method gave better sensitivity in control of the pendulum about its upright
unstable equilibrium position with less time and definitely indicated that the method is an energy efficient
method when compared with other methods like direct pole placement. This method yielded results under
the influence of time delay and have proven that the influence of time delay is significantly felt and would
cause loss of energy, however the presence of flower pollination for optimization minimizes the loss
incurred due to time delay and makes the system significant in terms of sensitivity.
Evaluation of Over-speed, Burst Margin and Estimation of Low-cycle Fatigue Li...AM Publications
Aero engine rotor burst evaluation is one of the most important problems to be taken care off, whenever it comes to designing a turbo machinery disc. The consequences of a fiasco can be intense, since the disc disintegrates into multiple pieces and they are hurled away in all the possible direction at high speeds. Due to high thermo-mechanical loading conditions the disc is subjected to varying degrees of temperature from bore to rim. However, the centrifugal force dominates in the disc which ranges from 85%-90% and the rest can be treated as thermal and gas loads. The challenge lies at designing a disc for off design conditions with their varying loads and duty cycles. In present work evaluation of safety margins and low-cycle fatigue (LCF) estimation of an aero engine disc through classical methods and blending the terminologies with simulation engineering to arrive at a probable interpretation of number of duty cycles is carried out. The methodology compares the fatigue parameters involved in evaluation of disc life. The design tool closely connects the flight certification requirement, namely Flight Readiness Certification, Federal Aviation Administration and European Aviation Safety Agency the regulating agencies for safety in air transportation vehicles. Speed regulations through API and MIL handbook for material specification using finite element analysis approach.
The College & Career Readiness & College Completion Act was signed by the Governor of Maryland in 2013. Hopefully, in a few years’ time college instructors will find that the students entering their classes are better prepared. But what do we do in the meantime? The ability to embed student success skills into the course curriculum is essential so that students can develop techniques that will improve their chances of success throughout their college career.
The following topics were shared during the presentation: concept mapping, critical thinking, tips for proper reading of a textbook, time management, notetaking tips, how to condense information covered in class, and how to research and write a paper.
The challenge of teaching student success skills during the semester is that of completing all required course information at the same time. Participants were asked to discuss potential methods of creating time within their courses so that student success techniques could be taught.
KREKELS, UW PARTNER VOOR
UW MERKPROMOTIE
Bij KREKELS draait alles om de klant, om u dus, al veertien
jaar lang. In die tijd heeft ons bedrijf tonnen ervaring opgedaan, en veel know-how ontwikkeld. Met maar één
doel voor ogen: uw merk en uw boodschap maximaal
zichtbaar maken op locatie. Met producten als tenten,
vlaggen en banners – onverbiddelijke eyecatchers op evenementen. Maar ook met pop-up walls, roll-ups en
beurswanden, die u helpen de show te stelen op beurzen en in showrooms.
Numerical study of disk drive rotating flow structure in the cavityeSAT Journals
Abstract
This paper aim in conducting the numerical simulation of laminar flow to explore disk-driven vortical flow structure of a cubical
container subjected to a disk rotation on the roof of the container in different Reynolds numbers to observe the flow structure and
the reason of vortical flow form. For this study, finite difference method with dispersion-relation- preserving (DRP) scheme is
dispersed governing equations space term, but adopt time term with TVD Runge-Kutta method. To add accuracy of numerical,
this thesis also uses topology theory to analyze the characteristic of singular point. Three-dimensional vertical flow is observed
flow structure and move to condition. The result to obtain Reynolds numbers to increase attracting spiral nodes increasingly
approaches the floor of the cavity. We have also depicted the vertical flow structure in terms of cortex cores which provide more
details about how change of the Reynolds number
Keywords: disk-driven, finite difference method, dispersion-relation-preserving (DRP), Runge-Kutta, topology theory
The need for high pump performance and efficiency continue to encourage the study of flow between two parallel co-rotating discs in multiple discs pump or turbine. Therefore, this study entails the design, construction and CFD simulation of a 3D Tesla pump model axisymmetric swirling flow in order to enhance the understanding of Tesla pump for future development.
Method of solution entails designing and construction of a small prototype tesla pump and then using the design geometry and parameters to design and perform numerical simulation. The results of the numerical simulation were then analyzed.
The result obtained indicates static pressure to have minimum value of -4.7791Pa at the outlet and 13.777Pa at the pump inlet and with velocity magnitude having minimum velocity of 0.00m/s and maximum velocity of 4.12m/s. The strength of the velocity was seen to be very high at the pump outlet. The analysis radial velocity showed minimum value of -0.508m/s and maximum value of 3.981m/s with the radial velocity vector being concentrated at the discs periphery and outlet.
Model simulation results exhibited smooth pressure and velocity profiles. With the 3D simulation all flow variables are able to be predicted.
Estimation of water momentum and propeller velocity in bow thruster model of...IJECEIAES
Autonomous surface vehicle (ASV) is a vehicle in the form of an unmanned on-water surface vessel that can move automatically. As such, an automatic control system is essentially required. The bow thruster system functions as a propulsion control device in its operations. In this research, the water momentum and propeller velocity were estimated based on the dynamic bow thruster model. The estimation methods used is the Kalman filter (KF) and ensemble Kalman filter (EnKF). There are two scenarios: tunnel thruster condition and open-bladed thruster condition. The estimation results in the tunnel thruster condition showed that the root mean square error (RMSE) by the EnKF method was relatively smaller, that is, 0.7920 and 0.1352, while the estimation results in the open-bladed thruster condition showed that the RMSE by the KF method was relatively smaller, that is, 1.9957 and 2.0609.
Development of a floating tow body for shallow water bottom and sub bottom im...eSAT Journals
Abstract
A floating tow body which can be towed at a speed range of 2-6 knots with a pay load of 50 kg is designed and tested as part of the development of a Buried Object Location Sonar (BOLS) for shallow water imaging application. In this paper the results of extensive towing tank measurements of a floating tow body with the diamond and a cross shaped bow are presented and compared. A cross shaped bow with a stream lined body shape is adopted for the floating tow body for minimizing the drag as well as the turbulence during the tow. Both the bow shape as well as the dimensions of the body is optimized based on the towing tank experimental results so that the body can be towed smoothly with minimum turbulence to avoid acoustic noise generation during the SONAR tests. An iterative experimental procedure is carried out in finalizing the dimensions and the shape of the tow body.
Keywords: Floating tow body, bow shape, towing test.
Dynamics Behaviour of Multi Storeys Framed Structures by of Iterative Method AM Publications
Dynamics refers to the branch of mechanics that deals with the movement of objects and the forces that drive that movement. Structural analysis which covers the behaviour of structures subjected to dynamic (actions having high acceleration) loading. Dynamic loads include people, wind, waves, traffic, earthquakes, and blasts. Any structure can be subjected to dynamic loading. Dynamic analysis can be used to find dynamic displacements, time history, and the frequency content of the load. One analysis technique for calculating the linear response of structures to dynamic loading is a modal analysis. In modal analysis, we decompose the response of the structure into several vibration modes. A mode is defined by its frequency and shape. Structural engineers call the mode with the shortest frequency (the longest period) the fundamental mode. This paper presents a study on mode shape, inertia force, spring force and deflection of multi storied framed structures by comparison of stodola’s and Holzer method. This study involves in examination of theoretical investigations of multi storied framed structures. Overall four storey multi storied framed structures and two methods were analysed & comparison of all the mode shape, inertia force, spring force and deflection at the critical cross-section with same configuration loading by keeping all other parameters constant. The theoretical data are calculated using code IS 1893, IS 4326, IS 13920. The all storey mass and stiffens are analysed under the cantilever condition. The research project aims to provide which method is most accuracy to find the mode shape, spring force deflection and inertia force. The studies reveal that the theoretical investigations Stodola’s method is most accuracy compare to the Holzer method. The maximum mode shape, spring force, spring deflection and inertia force is 87.29%, 80 %, 89% and 72% is higher the Stodola’s method compare than Holzer method in same configuration.
Review on Design Optimization of Liquid Carrier Tanker for Reduction of Slosh...IOSR Journals
Abstract: This Paper Reviews Briefly The Current Research On Sloshing And Its Effect In Liquid Carrier
Tanker. The Aim Of This Paper To Study The Basics Of Sloshing And Its Prevention (Mainly In Liquid Carrier
Tanker) The Liquid Sloshing Is Free Surface Fluctuation Of Liquid When Its Container Is Excited By External
Vibrations Such As Earthquakes. The Liquid Sloshing May Cause Various Engineering Problem, For Example
Instability Of Ships In Aero Engineering And Ocean Engineering, Failures On Structural Systems Of The
Liquid Container. The Tanker Used For The Transportation Of Liquid Over The Road-Ways Is An Integral
Part Of The Carrier/Vehicle. The Tanker Is Expected To Withstand The Unbalanced Forces On Account Of
Transit Over Uneven And Irregular Surfaces/Contours Of The Road As Also Due To Sudden Acceleration Or
Deceleration (Due To Application Of Brakes).
Keywords-Sloshing, Impact, Baffle, Simulation
Drag Optimization of Bluff Bodies using CFD for Aerodynamic Applicationsijceronline
This paper deals with the optimization of bluff bodies and analysis of fluid flow behaviour around bodies using CFD. Three test cases of bluff bodies; mainly two-dimensional rectangular body, radial rectangular shape and bullet shaped body were considered in this paper. Their shapes were optimised to achieve aerodynamic body shape using drag coefficient as main criteria. The other aerodynamic characteristics like formation of different eddy loops due to eddy viscosity, lift force coefficient and pressure force with Mach number were also investigated. It is concluded that aerodynamically; bullet shaped body is best among all the cases
The College & Career Readiness & College Completion Act was signed by the Governor of Maryland in 2013. Hopefully, in a few years’ time college instructors will find that the students entering their classes are better prepared. But what do we do in the meantime? The ability to embed student success skills into the course curriculum is essential so that students can develop techniques that will improve their chances of success throughout their college career.
The following topics were shared during the presentation: concept mapping, critical thinking, tips for proper reading of a textbook, time management, notetaking tips, how to condense information covered in class, and how to research and write a paper.
The challenge of teaching student success skills during the semester is that of completing all required course information at the same time. Participants were asked to discuss potential methods of creating time within their courses so that student success techniques could be taught.
KREKELS, UW PARTNER VOOR
UW MERKPROMOTIE
Bij KREKELS draait alles om de klant, om u dus, al veertien
jaar lang. In die tijd heeft ons bedrijf tonnen ervaring opgedaan, en veel know-how ontwikkeld. Met maar één
doel voor ogen: uw merk en uw boodschap maximaal
zichtbaar maken op locatie. Met producten als tenten,
vlaggen en banners – onverbiddelijke eyecatchers op evenementen. Maar ook met pop-up walls, roll-ups en
beurswanden, die u helpen de show te stelen op beurzen en in showrooms.
Numerical study of disk drive rotating flow structure in the cavityeSAT Journals
Abstract
This paper aim in conducting the numerical simulation of laminar flow to explore disk-driven vortical flow structure of a cubical
container subjected to a disk rotation on the roof of the container in different Reynolds numbers to observe the flow structure and
the reason of vortical flow form. For this study, finite difference method with dispersion-relation- preserving (DRP) scheme is
dispersed governing equations space term, but adopt time term with TVD Runge-Kutta method. To add accuracy of numerical,
this thesis also uses topology theory to analyze the characteristic of singular point. Three-dimensional vertical flow is observed
flow structure and move to condition. The result to obtain Reynolds numbers to increase attracting spiral nodes increasingly
approaches the floor of the cavity. We have also depicted the vertical flow structure in terms of cortex cores which provide more
details about how change of the Reynolds number
Keywords: disk-driven, finite difference method, dispersion-relation-preserving (DRP), Runge-Kutta, topology theory
The need for high pump performance and efficiency continue to encourage the study of flow between two parallel co-rotating discs in multiple discs pump or turbine. Therefore, this study entails the design, construction and CFD simulation of a 3D Tesla pump model axisymmetric swirling flow in order to enhance the understanding of Tesla pump for future development.
Method of solution entails designing and construction of a small prototype tesla pump and then using the design geometry and parameters to design and perform numerical simulation. The results of the numerical simulation were then analyzed.
The result obtained indicates static pressure to have minimum value of -4.7791Pa at the outlet and 13.777Pa at the pump inlet and with velocity magnitude having minimum velocity of 0.00m/s and maximum velocity of 4.12m/s. The strength of the velocity was seen to be very high at the pump outlet. The analysis radial velocity showed minimum value of -0.508m/s and maximum value of 3.981m/s with the radial velocity vector being concentrated at the discs periphery and outlet.
Model simulation results exhibited smooth pressure and velocity profiles. With the 3D simulation all flow variables are able to be predicted.
Estimation of water momentum and propeller velocity in bow thruster model of...IJECEIAES
Autonomous surface vehicle (ASV) is a vehicle in the form of an unmanned on-water surface vessel that can move automatically. As such, an automatic control system is essentially required. The bow thruster system functions as a propulsion control device in its operations. In this research, the water momentum and propeller velocity were estimated based on the dynamic bow thruster model. The estimation methods used is the Kalman filter (KF) and ensemble Kalman filter (EnKF). There are two scenarios: tunnel thruster condition and open-bladed thruster condition. The estimation results in the tunnel thruster condition showed that the root mean square error (RMSE) by the EnKF method was relatively smaller, that is, 0.7920 and 0.1352, while the estimation results in the open-bladed thruster condition showed that the RMSE by the KF method was relatively smaller, that is, 1.9957 and 2.0609.
Development of a floating tow body for shallow water bottom and sub bottom im...eSAT Journals
Abstract
A floating tow body which can be towed at a speed range of 2-6 knots with a pay load of 50 kg is designed and tested as part of the development of a Buried Object Location Sonar (BOLS) for shallow water imaging application. In this paper the results of extensive towing tank measurements of a floating tow body with the diamond and a cross shaped bow are presented and compared. A cross shaped bow with a stream lined body shape is adopted for the floating tow body for minimizing the drag as well as the turbulence during the tow. Both the bow shape as well as the dimensions of the body is optimized based on the towing tank experimental results so that the body can be towed smoothly with minimum turbulence to avoid acoustic noise generation during the SONAR tests. An iterative experimental procedure is carried out in finalizing the dimensions and the shape of the tow body.
Keywords: Floating tow body, bow shape, towing test.
Dynamics Behaviour of Multi Storeys Framed Structures by of Iterative Method AM Publications
Dynamics refers to the branch of mechanics that deals with the movement of objects and the forces that drive that movement. Structural analysis which covers the behaviour of structures subjected to dynamic (actions having high acceleration) loading. Dynamic loads include people, wind, waves, traffic, earthquakes, and blasts. Any structure can be subjected to dynamic loading. Dynamic analysis can be used to find dynamic displacements, time history, and the frequency content of the load. One analysis technique for calculating the linear response of structures to dynamic loading is a modal analysis. In modal analysis, we decompose the response of the structure into several vibration modes. A mode is defined by its frequency and shape. Structural engineers call the mode with the shortest frequency (the longest period) the fundamental mode. This paper presents a study on mode shape, inertia force, spring force and deflection of multi storied framed structures by comparison of stodola’s and Holzer method. This study involves in examination of theoretical investigations of multi storied framed structures. Overall four storey multi storied framed structures and two methods were analysed & comparison of all the mode shape, inertia force, spring force and deflection at the critical cross-section with same configuration loading by keeping all other parameters constant. The theoretical data are calculated using code IS 1893, IS 4326, IS 13920. The all storey mass and stiffens are analysed under the cantilever condition. The research project aims to provide which method is most accuracy to find the mode shape, spring force deflection and inertia force. The studies reveal that the theoretical investigations Stodola’s method is most accuracy compare to the Holzer method. The maximum mode shape, spring force, spring deflection and inertia force is 87.29%, 80 %, 89% and 72% is higher the Stodola’s method compare than Holzer method in same configuration.
Review on Design Optimization of Liquid Carrier Tanker for Reduction of Slosh...IOSR Journals
Abstract: This Paper Reviews Briefly The Current Research On Sloshing And Its Effect In Liquid Carrier
Tanker. The Aim Of This Paper To Study The Basics Of Sloshing And Its Prevention (Mainly In Liquid Carrier
Tanker) The Liquid Sloshing Is Free Surface Fluctuation Of Liquid When Its Container Is Excited By External
Vibrations Such As Earthquakes. The Liquid Sloshing May Cause Various Engineering Problem, For Example
Instability Of Ships In Aero Engineering And Ocean Engineering, Failures On Structural Systems Of The
Liquid Container. The Tanker Used For The Transportation Of Liquid Over The Road-Ways Is An Integral
Part Of The Carrier/Vehicle. The Tanker Is Expected To Withstand The Unbalanced Forces On Account Of
Transit Over Uneven And Irregular Surfaces/Contours Of The Road As Also Due To Sudden Acceleration Or
Deceleration (Due To Application Of Brakes).
Keywords-Sloshing, Impact, Baffle, Simulation
Drag Optimization of Bluff Bodies using CFD for Aerodynamic Applicationsijceronline
This paper deals with the optimization of bluff bodies and analysis of fluid flow behaviour around bodies using CFD. Three test cases of bluff bodies; mainly two-dimensional rectangular body, radial rectangular shape and bullet shaped body were considered in this paper. Their shapes were optimised to achieve aerodynamic body shape using drag coefficient as main criteria. The other aerodynamic characteristics like formation of different eddy loops due to eddy viscosity, lift force coefficient and pressure force with Mach number were also investigated. It is concluded that aerodynamically; bullet shaped body is best among all the cases
Investigations of laminar fluid flow between two moving or stationary plates, and two rotating discs, over the years were geared toward how to increase Tesla-based turbine efficiency. Therefore, this research entails the construction, design and simulation of a Tesla turbine in order to investigate the potential of Tesla turbine for energy generation. Method of solution entails the design and construction of a physical model Tesla turbine from locally sourced materials. The physical model geometry and design parameters were then used to conduct numerical simulation. Performance evaluation was then carried on the physical model and the simulation model. The result showed that voltage, current and power all increase with increase in rev. per minute. The result obtained indicates that for higher power generation, a Tesla turbine design with higher revolution per minute capability will be required. Turbine model simulation showed that radial velocity vector to be concentrated at the discs periphery and outlet.
The research results are good references for design of larger Tesla turbine for community use.
Investigations of laminar fluid flow between two moving or stationary plates, and two rotating discs, over the years were geared toward how to increase Tesla-based turbine efficiency. Therefore, this research entails the construction, design and simulation of a Tesla turbine in order to investigate the potential of Tesla turbine for energy generation. Method of solution entails the design and construction of a physical model Tesla turbine from locally sourced materials. The physical model geometry and design parameters were then used to conduct numerical simulation. Performance evaluation was then carried on the physical model and the simulation model. The result showed that voltage, current and power all increase with increase in rev. per minute. The result obtained indicates that for higher power generation, a Tesla turbine design with higher revolution per minute capability will be required. Turbine model simulation showed that radial velocity vector to be concentrated at the discs periphery and outlet.
The research results are good references for design of larger Tesla turbine for community use.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The purpose of this study is to design experiments to determine the impact of ship
aerodynamics in Indonesia using the Computational Fluid Dynamic method and
compare the impact of fuell consumption and load from experimental testing. Thus, it
can be known in detail about the voltage that occurs up to the final speed of the ship
during testing. In the preparation of this research the first step is to model the end of
the ship using CAD software from the original model used in experimental testing. The
next thing is to determine the value of the mechanical properties of the material and
then put it in the CAE software. In CAE software, it is also determined about the
boundary conditions of the material and then determines the speed. The next thing to
do is the process of meshing the plate and ammunition and after the meshing process
is proceeded to the running process. In contrast to experimental testing where there
are various obstacles, the data produced by testing the Computational Fluid Dynamic
method and experimental testing can sometimes be different. This is because in the
testing process using Computational Fluid Dynamic, conditions are always in optimal
conditions.
Comparision of flow analysis through a different geometry of flowmeters using...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
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NUMERICAL STUDY OF FLUID FLOW AROUND A DIVER HELPER
1. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
DOI : 10.14810/ijmech.2016.5105 61
NUMERICAL STUDY OF FLUID FLOW AROUND
A DIVER HELPER
Hesamedin habibi1
, Ali Yari2
, S. Hosseinzadeh3*
,Saeed Darzi BurKhani4
1,4
Department of Mechanical Engineering, University College of Rouzbahan, Sari, Iran
2
Department of Mechanical Engineering, University of Shiraz, Shiraz, Iran
3
* Corresponding author, Department of Mechanical Engineering, Islamic Azad
University, West Tehran Branch,Tehran, Iran
ABSTRACT
Having access to high speed diving without the use of mechanical science and discovery centers have been
considered. Production of simple, yet effective tool to reduce energy consumption and associated diver is
very valuable. Assistant diver device that works with human muscle power, includes a pair of ballets. This
system reduces the energy required to dive to less than half as the speed increases to 2 to 5 knot. Using
numerical methods can answer a lot of questions and a simulation of the dynamic behavior of the device. In
this article, modeling of fluid flow around the Diver helper of FLUENT software and using Dynamic Mesh
have been done.
Flow lines show an increase in the angle of the fins and causes development of vortices behind them.
Pressure Cantor can also be used in the analysis of the fins. The drag coefficient ballet based on the device
at various angles in a period is reported in charts.
KEYWORDS
Hydro-foil, drag coefficient, lift coefficient, fin swimming, Computational Fluid Dynamics
1. INTRODUCTION
Diver helper is a portable device that can be used in reconnaissance operations, rescue and
military substantially to work. Using a companion diver diving speed can be increased to twice
the maximum speed as be stable. Any other equivalent device with these characteristics is unique.
Much of this research has been on the swim fins. Ballet swimming fins like that help moving the
water in underwater activities such as swimming, diving and water sports covered on foot.
Pendergast et al. investigated effects of geometry, mass, density and roughness factor on the
speed and efficiency of economic analysis examined as the use of swim fins [4, 5].
Toshiyant et al. and Zamparoet al. performed two separate studies comparing the use of the fins
with their bare feet [1, 2, and 3]. However, the exact impact on the performance characteristics of
swimming fins quantifies the important issue. To date, the most common way to assess swim fins
driving force is based on studies of "swimmer fins" as a global system which includes
biomechanical and physiological responses and physiological point of view, oxygen consumption
to assess the amount of energy used in swim fins [6, 7, 8, and 9].
But only few studies on the relationship between the physiological and mechanical characteristics
of ballet or swimming techniques have been done on the subject. The last parameter directly
2. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
62
related to the performance of the ballet requires a biomechanical study. Kinematic studies,
analysis of swimming techniques are proved with this model [1, 2,].
However, this type of analysis investigated the relationship between cause and effect parameters
and did not clear properly and can only be assessed through a variety of dynamic levels. In early
studies, the maximum forces in swimming with fins different place are compared [10, 11, 12, and
13].
But the real situation is very different condition of water flow around a swimmer and reported
values may be overestimated [14]. In another article, the measured values have been reported in
swimming motions [15].
Using a methodology that is used in another article is considered for analysis [2, 3] can be used
for economic analysis and calculation of the efficiency of swimming with fins at low speeds to be
used. However, the assessment of the effects on the overall performance of the ballet alone will
be more difficult. The alternative method is considered only in the fin system.
Given the interaction of the fluid and to address this deficiency, swimming fins as different
authors are under the terms of the quasi-static mode (wind tunnel waterway) to evaluate the drag
coefficient and lift [16, 17]. In spite of such a manner, the impact of transitory is taken into
consideration [18].
It is noteworthy that the former swimmers care swimming techniques that can affect the test and
this may lead to differences in the results. The various techniques used by the swimmer make it
difficult to differentiate the effects of fin effects.
In this paper designed a new device called a Diver helper, it can be replaced as the original design
of the device with fluid flow modelling FLUENT software according to using Dynamic Mesh
around.
2. PRODUCTION OF GEOMETRY
One of the most important phases in numerical analysis is modeling object which is analyzed. By
way of analysis, modeling is more sensitive. Model must have certain characteristics. There are
many applications for modeling and production volume.
The project is due to the need for high accuracy and volume of the body of Catia software that is
used to generate geometry.The advantages of this software can include high precision surface
grinding, ability to work with the original parts, CNC machine connections and generating output
files that have the capability to mesh software that can be mentioned.
Turning the volume level and the output file was sent to the software Gambit. Gambit is one of
powerful software applications in the field of Mesh. The software output as input software Ansys-
Fluent is considered. How the system designs the first leg of the diver companion embedded in a
rail mounted on the diver's legs, is due to bending the knee to move in the water there. This type
of diving water is drawn from the tail of a dolphin. The main objective for the installation of
various components is stabilizing at the end of the leg introduced as a companion diver machine
in Figure 1.
1. The core of the device is that the various components are mounted on it.
2. The device includes a pair of fins, and is the main cause for the device.
3. Trans-ferrous Bush attached to the front of the device that is placed in it.
3. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
63
4. Trans-iron is the main interface and ballet.
5. Copper wire that connects the spring ballet interface
6. Shock device that can determine the flow of the ballet
7. Leg of that diver to use it to your device closes
8. The page that leg through the bolts attached to the main axis
9. Bolts M6 and M5 that connects the main axis parts.
10. Stabilizing device which prevents distortion when scuba diver is on track and to be desired.
11. Piece L-shaped stabilizer is attached by bolts to the core.
Figure1. a) Three-dimensional design of software Catia
b) Introduction of system components
3. DOMINATED EQUATIONS
Assuming incompressible flow, mass conservation equations (continuity) and conservation of
momentum (Navier-Stokes) are as follows:
(1)0div U
(2)
( )
( ) ( . ( ))
u P
div uU div grad u
t x
( )
( ) ( . ( ))
v P
div vU div grad v
t y
( )
( ) ( . ( ))
w P
div wU div grad w g
t z
4. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
64
In this equation, U is velocity vector, P is static pressure on the fluid, µ is viscosity and w and v,
u are the velocity vector components.To model the movement of float, over time is used to solve
the equations of motion of rigid body. Rigid body motion of the coordinate system is used to
check system. The inertial coordinate system is connected to the ground and XYZ coordinate
system is a free system that has accelerated the pace.
Equation of motion of the machine axis as a function of time is:
Disruption to the existing two-equation ( k ) model has been modelled. In this model, the
turbulent times turbulent flow energy is according variables K and dissolution rate of viscous
turbulent energy ( ) States:
( ) t
k
k
k
Uk k P
t
1 2
( ) t
kU C P C
t k
4. AREA MESHING SOLUTION
One thing that is very important is to select the dynamic analysis of floating range and Mesh
solutions.
For example: if the border around the object was small, the results are affected, causing large
errors in results, and if the line is selected, the calculation time and therefore costs will increase.
Therefore, we must seek an optimal size to be floating. By examining the documents (of ponds
stretch) to the front, the total length to the back of the float, is four times the overall length of the
vessel to the top and the bottom, the size of the vessel and to the side, twice the length of the float
which is selected.
In Figures 2 and 3, we show the grid around the body of the device that is displayed. Due to the
complex geometry of Meshing with tetragonal mode, tetrahedral elements have been used around
the body.
In addition to reducing the number of cells in remote areas of the fuselage, an organized Mesh
with cubic elements is used.
5. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
65
Figure 2. Production Meshes around the machine
Figure 3. Production of fins on the Mesh
5. INDEPENDENCE OF MESH
The total number of elements used in this case is 1532541. Meshes have the structure and size of
the cells around the body of the device which is smaller. To evaluate the effect of improving the
Mesh solution, the number of nodes is determined by Mesh, as suitable respectively is increased.
To examine the independence of the Mesh, it has static mode and has been investigated in four
different Meshing. By comparing the drag acting on the float, about 3/06 percent error between
the solutions in the Mesh shows a large seal. But the important thing here is time. High
computational mesh number was low due to the error between the Meshes. As seen in diagram 1,
the error between stages 3 and 4 is very low. Taking into account that, the time as a factor for
computing Meshing can be used to stage 3.
Diagram 1. Drag exerted on the device in four different Meshing
6. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
66
6. RESULTS AND DISCUSSION
To solve this problem in the dynamic of temporal resolution, fluent software is used to step the
right time. If the resolution is according to the first time a step taken in the last step, we should
reduce the amount of acceptable error system.
Figure 4. The pattern of flow lines around the device in landscape mode
Figure 4 and 5 lines flow around the device in landscape mode also shows a 30 ° angle.
Horizontal mode, parallel lines and the flow to the body stick is seen at an angle of 30 degrees
centered and phenomena such as separation from the end of the ballet shows the formation of
vortex and Finally loss occurs downstream of the vortex. Physical instability causes this flow
field and thus forces the surface of the device which also will be unstable.
Figure 5. The pattern of flow lines around the machine at an angle of 30 degrees
7. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
67
Figures 6 and 7, respectively, show pressure and velocity contours as three-dimensional image as
the shell of the device.Darker color represents areas with high pressure and low speed more and
more bright colors for areas with speed and pressure. As it is clear is that the central axis swing
upward pressure on the upper area of the fins around axis is created. It is noteworthy that back
ballet created by the shock process that creates thrust.
Figure 6. Cantor pressure on the theme of the 0520/1 second time in the 4-degree angle Ballet
Figure 7. Contour speed on the theme of the 0520/1 second time at 45-degree angle at the ballet
Diagram 2 shows curve drag coefficient of resonant mode during a period of ballet as full swing.
As can be seen, the drag coefficient is a non-periodic fluctuates. Physical instability in mentioned
fluctuations is due to the flow field and thus forces the surface of the device that also will be
unstable.
8. International Journal of Recent advances in Mechanical Engineering (IJMECH) Vol.5, No.1, February 2016
68
Diagram 2. Drag exerted on the dynamics of a swinging at T = 1.31
7. CONCLUSION
In this article, flows of new devices that can replace the companion diver fins swimming in a
swinging motion is studied.Lines vortex fluid flows around the fin shows that is possible by
increasing the angle of the flaps created and expanded. The pressure field and the drag coefficient
of the reciprocating motion ballet as contour and curve has been reported here.This can
empirically is tested on the device and is checked as the actual flow around it and compared with
modelling software.
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