1. Hybrid Technology
Seeing the future before it happens
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Our scope
About Us
We are an association of authorized self
employed naval architects, which deals Motto:
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primarily with complex Computational Fluid
Dynamics (CFD) analysis of ships and other
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marine structures which operates at sea.
The key points of our strategy are based on:
Highly qualified people who have
interdisciplinary abilities
Thorough knowledge of Naval Architecture
principles
Experience in CFD techniques applied for The rational Eye of Horus
Marine applications Reshapes the traditional views
Working with our own CFD codes which can be Into modern concepts
quickly adapted for the projects in study Which allow us modeling
The future into a more precise picture.
Adapting to our clients needs by
programming in languages as Fortran, C++,
Java to offer the high quality output of
our work
Ability of using other well recognized CFD
codes (Fluent, STAR CD, CFX, WAMIT) for
solving the problems issued by the clients.
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To contact us: Computational
Fluid
Dynamics for
Mobile: +40 746017891
Future in the Past nechita67@yahoo.com Naval
Architecture
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2. Hybrid Technology
Seeing the future before it happens
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Our team includes the highly qualified specialists:
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Dr. Eng. Mirel Nechita
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Computational Fluid Dynamics
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Dipl. Eng. Paul Boazu
Conceptual Design and Naval Architecture
Dipl. Eng. Gabriel Necula
Marketing Counseling and Naval Architecture
Giant waves breaking on the deck of
the oil freighter Esso Languedoc
To contact us:
Ovidiu 5, Bloc M12, Apt. 16
Future in the Past Galati 800080
Romania
Mobile: +40 746017891
nechita67@yahoo.com
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3. Hybrid Technology
Seeing the future before it happens
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About Us
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To contact us:
List of Publications Dr.Eng. Mirel Nechita
Ovidiu 5, Bloc M12, Apt. 16
Galati 800080
Future in the Past Romania
Mobile: +40 746017891
nechita67@yahoo.com
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4. Hybrid Technology
Seeing the future before it happens
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About Us Body lines fairing
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Z
X Y
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· More details... · More details...
Ship resistance and steady flow Unsteady flow computations
· More details... · More details...
Sea keeping computations Offshore hydrodynamics
· More details... · More details...
Hull form improvement Restoration of ancient hull forms
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Other services
CFD simulation of different kind of low scale flows (pipes, fans, pumps, etc.)
Converting old codes written in Fortran to C++ or Java
Creating graphical interfaces for console applications
Possibility of designing/realization of experimental devices for validation of
theoretical approaches and numerical simulations
Translations of technical documentation: Romanian/English and English/Romanian
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5. Hybrid Technology
Seeing the future before it happens
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Body Lines Fairing < Return to Service List
Based on initial drawings of bodylines and/or loft book
About Us we combine the principal elements of the ship in focus
and performing high quality lines fairing. Optionally we
Contact Us can also provide the surface generated consequently.
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Transverse view of faired hull form of a
fishing vessel
To contact us:
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6. Hybrid Technology
Seeing the future before it happens
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Hull surface discretization < Return to Service List
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Having defined the surface of the hull
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surface (in some cases are necessary
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only the stations defined), we are able
Contact Us to discretize the hull surface in a
structured grid for using it in different
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their own purposes
Discretization of hull surface for a fishing vessel
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nechita67@yahoo.com
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7. Hybrid Technology
Seeing the future before it happens
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Ship Resistance and Steady Flow < Return to Service List
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Using our own 3D Panel Rankine code (linear and
About Us nonlinear) we are able to perform computations for
steady wave pattern and steady wave pressure
Contact Us distribution on the ships hull.
List of Publications Also more insight computations can be made using
advanced codes (as STAR CCM or CFX) for
computing the ship resistance and also a more realistic
pattern of the steady wave.
Steady wave on a cargo ship computed with
linear and nonlinear 3D Panel Rankine code
To contact us:
Mobile: +40 746017891
nechita67@yahoo.com
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8. Hybrid Technology
Seeing the future before it happens
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Unsteady Flow < Return to Service List
Using our own code (called HYBRID) - based on
About Us Radiation/Diffraction 3D Panel method - we are
able to compute the unsteady waves produced by
Contact Us the ship in her route thru the encountering waves.
List of Publications Also the components of the unsteady pressure on
the ships hull are computed.
Contour plots of the diffraction wave
produced by a cargo ship advancing in waves
To contact us:
Mobile: +40 746017891
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9. Hybrid Technology
Seeing the future before it happens
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Sea keeping Computations < Return to Service List
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The sea keeping computations are done by using
About Us codes based on Strip Method, and Rankine 3D
Panel Method (linear and nonlinear).
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The output of the codes will include Response
List of Publications Amplitude Operators (RAO) of each motion and
also the RMS of global motions and accelerations
of ship which operates in different sea states and
desired headings.
The quantitative results will be analyzed for
satisfying the sea keeping criteria imposed by the
clients.
RAO of Heave motion for a thin ship
computed with different codes
To contact us:
Mobile: +40 746017891
nechita67@yahoo.com
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10. Hybrid Technology
Seeing the future before it happens
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Offshore Hydrodynamics < Return to Service List
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The goal of this service is analyzing wave interactions with
About Us offshore platforms and other structures or vessels.
Contact Us Combined Boundary Integral Equations are used as a tool for
solving the velocity potential and fluid pressure on the submerged
List of Publications surfaces of the bodies. Also, simultaneously, is solved the
diffraction problem ( the effects of incident waves on the body)
and the radiation problems for each motion of the bodies,
hydrodynamic forces including added-mass and damping
coefficients, exciting forces, response-amplitude operators
(RAO's), the pressure and fluid velocity, and the mean drift forces
and moments.
Offshore structure during
operation at sea
To contact us:
Mobile: +40 746017891
nechita67@yahoo.com
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11. Hybrid Technology
Seeing the future before it happens
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Hull Form Improvement < Return to Service List
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Fish eye view Hull form improvement for a fast ship with respect to
the improved hull)
Improvement of the ship performance by iterative changes of hull surface.
The improvements are done in respect with wave resistance component,
steady pressure distribution on the hull but alternatively can be made
considering the viscosity of the fluid and also taking into account sea
keeping performance of the ship.
To contact us:
Mobile: +40 746017891
nechita67@yahoo.com
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12. Hybrid Technology
Seeing the future before it happens
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Restoration of Ancient Hull Forms < Return to Service List
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Restoration of a Hanse cog hull form in a 3D model, based on sketches of her body plan.
up-to-date tools, providing 3D models of these ships which can be consequently used for the
actual restoration.
To contact us:
Mobile: +40 746017891
nechita67@yahoo.com
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13. Hybrid Technology
Seeing the future before it happens
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Published Papers
About Us
1.
Authors: Nechita, M.; Iwashita, H.; Iwasa, H.; Hidaka, Y.; Ohara, H.
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Title: Influence of the Fully Nonlinear Steady Wave Field on the Unsteady Wave Field of a Blunt Ship
Advancing in Waves
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Volume: Transactions of the West-Japan Society of Naval Architects, No.101, pp.37-48, (2001)
2.
Authors: Nechita, M.; Iwashita, H.; Tominaga, S.; Tanaka, S.; Kamisuji, K.
Title: A Bluntness Effect of Hull Form on Hydrodynamic Forces and Unsteady Waves of a Ship
Advancing in Waves
Volume: Transactions of the West-Japan Society of Naval Architects, No.102, pp.11-19, (2001)
3.
Authors: Iwashita, H.; Hidaka, Y.; Kishimoto, K.; Nechita, M.
Title: Side Wall Effects of a Towing Tank on the Measurement of Unsteady Waves of Ships Advancing
in Waves
Volume: Transactions of the West-Japan Society of Naval Architects, No.102, pp.21-33, (2001)
4.
Authors: Nechita, M.; Nabergoj, R., Obreja, D.; Alexandru, G.
Title:Steady Wave Field Influence on Seakeeping Performance of a Fishing Vessel
Volume: Brodogradnja Journal of Naval Architecture and Shipbuilding Industry , No.52, pp.113-117,
(2004)
International Conferences
1.
Authors: Iwashita, H.; Nechita, M.
Title: Influence of the Steady Wave Field in the Unsteady Wave Field of a Ship with Forward Speed
Conference: 4th Japan-Korea Joint Workshop on Ship & Marine Hydrodynamics
Place: Fukuoka, Japan
Date: (July 12-13, 1999)
2.
Author: Iwashita, H.; Calagrossi, A.; Landrini, M.; Bertram, V.; Nechita, M.
Title: A Critical Assessment of Potential Flow Models for Ship Seakeeping
Conference: 4th Osaka Colloquium on Seakeeping Performance of Ships
Place: Osaka, Japan
Date: (17th -21st October, 2000)
3.
Authors: Nechita, M.; Iwashita, H.; Iwasa, H.; Hidaka, Y.; Ohara, H.
Title: Influence of the Fully Nonlinear Steady Wave Field on the Unsteady Wave Field of a Blunt Ship
Advancing in Waves
Conference: Autumn Meeting of the West-Japan Society of Naval Architects
Place: Osaka, Japan
Date: 2000
4.
Authors: Nechita, M.; Iwashita, H.; Tominaga, S.; Tanaka, S.; Kamisuji, K.
Title: A Bluntness Effect of Hull Form on Hydrodynamic Forces and Unsteady Waves of a Ship
Advancing in Waves
Conference: Spring Meeting of the West-Japan Society of Naval Architects
Place: Shimonoseki, Japan
Date: 2001
5.
Authors: Iwashita, H.; Hidaka, Y.; Kishimoto, K.; Nechita, M.
Title: Side Wall Effects of a Towing Tank on the Measurement of Unsteady Waves of Ships Advancing
in Waves
Conference: Spring Meeting of the West-Japan Society of Naval Architects
Place: Shimonoseki, Japan
Date: 2001
6.
Authors: Alexandru, G.; Nechita, M.
Title: Steady and Unsteady Flow Simulation for a Fast Ship Forms Improvement
Conference: MARIND 2002
Place: Varna, Bulgaria
Date: 2002
7.
Authors: Nechita, M.; H. Iwashita
Title: A Hybrid Method for Seakeeping Estimation of Ships
Conference
Place: Rome, Italy
Date: October, 2003
8.
Authors: Nechita, M., Obreja, D, Alexandru, G.
Title: Influence of the Steady Flow on the Unsteady Wave Field for a Cargo Ship Advancing in Waves
Conference: "7th International Conference on Marine Science and Technology - Black Sea 2004"
Place: Varna, Bulgaria
Date: October 2004
9.
Authors: Nechita, M.
Title: A Hybrid Method for Seakeeping Estimation of Ships
Scientific seminar at CESOS, Trondheim
Place: Trondheim, Norway
Date: December 2004
10.
Authors: Nechita, M., Lungu A.
Title: Steady and Unsteady Flow Simulation for DTMB Combatant
Conference
Place: Galati, Romania
Date: December 2009
Future in the Past