Computational fluid dynamics (CFD) is the use of numerical methods and algorithms to solve and analyze problems involving fluid flows. CFD allows engineers to simulate fluid flow, heat transfer, and other related physical processes. It provides a virtual laboratory for testing new designs without building physical prototypes. CFD is used across many industries like aerospace, automotive, biomedical, and more. It complements experimental testing by reducing costs and providing comprehensive flow field data. The document discusses the basics of CFD including discretization methods like finite difference and finite volume, common boundary conditions, and where CFD is applied.
The Powerpoint presentation discusses about the Introduction to CFD and its Applications in various fields as an Introductory topic for Mechanical Engg. Students in General.
The Powerpoint presentation discusses about the Introduction to CFD and its Applications in various fields as an Introductory topic for Mechanical Engg. Students in General.
Presentation on Computational fluid dynamic smulation and benchmarking a dess...kush verma
Check out one of the first of its kind simulation work on Ranque Hilsch Vortex Tube. The authors have done exhaustive work including simulation (from multiple application software Ansys and OpenFOAM), programming (C++ and excel) and plots (excel and qtiplot) along with experimental work. They have simplified and standardized the process to an extend that it would even be helpful for a beginner in this field.
The presentation gives glances of the importance of CFD analysis in engineering design with an illustration/ case study. For more details, follow the webinar "Role of CFD in Engineering Design" on https://www.learncax.com/knowledge-base/blog/by-author/ganesh-visavale
1.Critically assess the aerodynamic characteristics of a vehicle.
2.Select and specify the most appropriate methods for wind tunnel testing of scale models and interpret the results of the test.
3.Analyse and critically evaluate the aerodynamic cooling systems.
Computational fluid dynamics (CFD) is a powerful tool to simulate, analyze, and optimize designs. The leading CFD providers will discuss software features and functionality such as flow features and benefits, solver technology, as well as describe an example of CFD use in the real world.
Abstract:This paper deals with the thermal and CFD analysis of automobile radiator. The theoretical calculation has been done in MAT Lab by varying the mass flow rate of coolant. Modeling has been done in Solidworks and exported to Ansys for CFD analysis. The temperature distribution, heat transfer rate for different velocities of coolant to has been done for different tube materials such as copper, aluminium and stainless steel. The numerical results were compared and found that copper has best heat transfer rate and has better efficiency than the others.
Presentation on Computational fluid dynamic smulation and benchmarking a dess...kush verma
Check out one of the first of its kind simulation work on Ranque Hilsch Vortex Tube. The authors have done exhaustive work including simulation (from multiple application software Ansys and OpenFOAM), programming (C++ and excel) and plots (excel and qtiplot) along with experimental work. They have simplified and standardized the process to an extend that it would even be helpful for a beginner in this field.
The presentation gives glances of the importance of CFD analysis in engineering design with an illustration/ case study. For more details, follow the webinar "Role of CFD in Engineering Design" on https://www.learncax.com/knowledge-base/blog/by-author/ganesh-visavale
1.Critically assess the aerodynamic characteristics of a vehicle.
2.Select and specify the most appropriate methods for wind tunnel testing of scale models and interpret the results of the test.
3.Analyse and critically evaluate the aerodynamic cooling systems.
Computational fluid dynamics (CFD) is a powerful tool to simulate, analyze, and optimize designs. The leading CFD providers will discuss software features and functionality such as flow features and benefits, solver technology, as well as describe an example of CFD use in the real world.
Abstract:This paper deals with the thermal and CFD analysis of automobile radiator. The theoretical calculation has been done in MAT Lab by varying the mass flow rate of coolant. Modeling has been done in Solidworks and exported to Ansys for CFD analysis. The temperature distribution, heat transfer rate for different velocities of coolant to has been done for different tube materials such as copper, aluminium and stainless steel. The numerical results were compared and found that copper has best heat transfer rate and has better efficiency than the others.
Application of Pinch Technology in Refrigerator Condenser Optimization by Usi...ijtsrd
Refrigeration is the major application area of thermodynamics, in which the heat is transferred to higher temperature region from a lower temperature region. Refrigerators are the devices which produce refrigeration and the refrigerators which operate on the cycles are called refrigeration cycles. Pinch technology and computational fluid dynamics CFD is key for study the condenser and enhance the better option for new design. Pinch Analysis also known as process integration, heat integration, energy integration, or pinch technology is method for minimizing the energy costs of a process by reusing the heat energy in the process streams rather than outside utilities. Mr. Mayur B. Ramteke | Prof. S. K. Bawne "Application of Pinch Technology in Refrigerator Condenser Optimization by Using CFD" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd46440.pdf Paper URL : https://www.ijtsrd.com/engineering/mechanical-engineering/46440/application-of-pinch-technology-in-refrigerator-condenser-optimization-by-using-cfd/mr-mayur-b-ramteke
A literature review on Computational fluid dynamic simulation on Ranque Hilsc...kush verma
Check one of the first systematic literature review on vortex tube in which a meticulous comparison of experimental and simulation work is done. D Alembert's paradox and paradox in general is witnessed and which ends with description from most appropriate author felt by the author (Behara et al).
Summer Training 2015 at Alternate Hydro Energy CenterKhusro Kamaluddin
This is the presentation i gave to "Defend" my Summer Training at AHEC IIT Roorkee During Summer 2015. I gave this presentation in my college during my final year. Indeed the most lengthy i ever gave .
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
3. What is computational fluid dynamics?
• Computational fluid dynamics (CFD) is a branch of continuum
mechanics which deals with numerical simulation of fluid flow and
heat transfer
• The result of CFD analyses is relevant engineering data used in:
– Conceptual studies of new designs.
– Detailed product development.
– Troubleshooting.
– Redesign.
• CFD analysis complements testing and experimentation.
– Reduces the total effort required in the laboratory.
2
4. Knowledge Prequisite
• Fluid dynamics
• Numerical Methods
• Heat transfer
Knowledge on Specific topics are required for specific applications
• Combustion
• Mass transfer with multispecies and multiphase
• Melting and solidification
• Rotodynamics
• Heat exchangers
• Aerospace
• Automotive
3
5. Fluid dynamics
• Fluid dynamics is the science of fluid motion.
• Fluid flow is commonly studied in one of three ways:
– Experimental fluid dynamics (EFD).
– Theoretical fluid dynamics (TFD).
– Numerically: computational fluid dynamics (CFD).
4
6. Numerical Vs Analytical Vs Experimental
• Experimental Investigations:
- full scale
• expensive and often impossible
• measurement errors
- on a scaled model
• simplified
• difficult to extrapolate results
• measurement errors
• Theoretical calculation:
- analytical solutions
• exist only for a few cases (example)
• sometimes complex
- numerical solutions
• for almost any problem 5
7. Modelling
• Advantages of modelling:
- cheaper
- more complete information
- capable of solving any complex problem
• Disadvantages of modelling:
- deals with a mathematical description not with reality
- multiple solutions can exist
6
8. Why use CFD?
• Relatively low cost.
– Using physical experiments and tests to get essential engineering
data for design can be expensive.
– CFD simulations are relatively inexpensive, and costs are likely to
decrease as computers become more powerful.
• Speed.
– CFD simulations can be executed in a short period of time.
– Quick turnaround means engineering data can be introduced early in
the design process.
• Ability to simulate real conditions.
– Many flow and heat transfer processes can not be (easily) tested,
e.g. hypersonic flow.
– CFD provides the ability to theoretically simulate any physical
condition.
7
9. Why use CFD?
• Ability to simulate ideal conditions.
– CFD allows great control over the physical process, and provides the
ability to isolate specific phenomena for study.
– Example: a heat transfer process can be idealized with adiabatic,
constant heat flux, or constant temperature boundaries.
• Comprehensive information.
– Experiments only permit data to be extracted at a limited number of
locations in the system (e.g. pressure and temperature probes, heat
flux gauges, LDV, etc.).
– CFD allows the analyst to examine a large number of locations in the
region of interest, and yields a comprehensive set of flow parameters
for examination.
8
10. Boundary conditions
Prescribed Temperature BC (First kind) Dirichlet conditions
Prescribed Heat Flux BC (Second kind) Neumann conditions
Convection BC (Third kind) Robbins cinditions
9
14. Where is CFD used?
• Where is CFD
used?
• Aerospace
• Automotive
• Biomedical
• Chemical
Processing
• HVAC
• Hydraulics
• Marine
• Turbomachine
• Power Generation
• Sports
Temperature and natural
convection currents in the eye
following laser heating. 13
15. Chemical Processing
Streamlines for workstation
ventilation
Where is CFD used?
• Where is CFD used?
• Aerospacee
• Automotive
• Biomedical
• Chemical
Processing
• HVAC
• Hydraulics
• Marine
• Turbomachine
• Power Generation
• Sports
14
16. Where is CFD used?
• Where is CFD used?
• Aerospace
• Automotive
• Biomedical
• Chemical Processing
• HVAC
• Hydraulics
• Marine
• Turbomachine
• Power Generation
• Sports
15
Power Generation
Turbomachine
Marine (wave pattern)
Sports
17. Post processor
•X-Y graph
•Contour
•Velocity vectors
•others
Pre processor
• Creation of geometry
• Mesh generation
• Material properties
• Boundary conditions
Solver settings
•Initialization
•Solution control
•Monitoring solution
•Convergence criteria
Physical Model
•Turbulence
•Combustion
•Radiation
•Other processes
Transport equation
•Mass
•Momentum
•energy
•Equation of state
•Supporting models
Three main elements of CFD Software
Solver
16
18. CFD - how it works (2)
• CFD applies numerical methods (called
discretization) to develop approximations of
the governing equations of fluid mechanics in
the fluid region of interest.
– Governing differential equations: algebraic.
– The collection of cells is called the grid.
– The set of algebraic equations are solved
numerically (on a computer) for the flow field
variables at each node or cell.
– System of equations are solved
simultaneously to provide solution.
• The solution is post-processed to extract
quantities of interest (e.g. lift, drag, torque,
heat transfer, separation, pressure loss, etc.).
Mesh for bottle filling
problem.
17
19.
Discretization
• Domain is discretized into a finite set of control volumes
or cells. The discretized domain is called the “grid” or the “mesh.”
• General conservation (transport) equations for mass, momentum,
energy, etc., are discretized into algebraic equations.
• All equations are solved to render flow field.
t
div u div grad S
t V
dV VdA
A
dA A V
S dV Fluid region of
pipe flow
unsteady convection diffusion generation
control
volume
discretized into
finite set of
control volumes
(mesh).
Other Discretization methods:
FDM, FEM 18
Eqn.
continuity 1
x-mom. u
y-mom. v
energy h
20. Discretization Methods
Classification of PDE
Elliptic, Parabolic & Hyperbolic Eqns
2 2 2
cont…
a
x2
b
xy
c
y2
d
x
e
y
f g 0
where coefficients are constants or fn's of the independent variables
b2 4ac
b2 4ac
b2 4ac
0 elliptic
0 parabolic
0 hyperbolic
(a) Elliptic PDE
2
x2
2
y2
0 Laplace eqn &
2
x2
2
y2
g(x,y) Poisson's eqn
where, b=0, a=1 and c=1 b
2
4ac 4 0
33. Finite Difference Method
Nume rical Er ror s: Numerical errors arise during computations due
to round-off errors and truncation errors.
(i) Round-off error
It is the difference between an approximation of a number used in
computation and its exact (correct) value.
e.g. 4.756 is rounded off to 4.76
(ii) Truncation error
It is the difference between an exact expression and the corresponding
truncated form used in the numerical solution.
Note: The difference between exact solution and numerical solution
with no round-off error is called Discretization error.
30
34. Grid Independence Test
It is nothing but the testing of how numerical solution has become
independent of grid spacing
Variation in the heat transfer rate with respect to the mesh count.
31
600
500
400
Selectedmeshcount
300
(520000)
200
100
0 2 4 6 8 10
Meshcountx105
HeatTransferRate(W)
45. Useful Text books
1] “An Introduction to CFD – The Finite Volume Method” by
H K Versteeg & W Malalasekara , Publication:: Pearson Education Ltd
2] “Numerical Heat Transfer and Fluid Flow” by Suhas V. Patankar,
Publication:: Taylor & Francis
3] “Computer simulation of Flow and Heat Transfer” by P.S. Ghoshdastidar,
Publication:: TMH
4] “CFD A Practical Approach” by Jiyuan Tu, Guan Yeoh & ChaoqunLiu,
Publication:: Elsevier
4] “The FEM for Fluid Dynamics” by O.C. Zienkiewicz, R.L. Taylor &
P. Nithiarasu, Publication:: Elsevier
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