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Seeing the future before it happens

Hybrid Technology

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Mobile: +40 746017891 [email protected]

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The rational Eye of Horus Reshapes the traditional views Into modern concepts Which allow us modeling The future into a more precise picture.

Our scope We are an association of authorized self employed naval architects, which deals primarily with complex Computational Fluid Dynamics (CFD) analysis of ships and other 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 Marine applications

Working with our own CFD codes which can be quickly adapted for the projects in study

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.

Motto:

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<!-- Begin ComputationalFluid Dynamics for Naval Architecture

Future in the Past


Hybrid Technology

Giant waves breaking on the deck of the oil freighter Esso Languedoc

About Us Our team includes the highly qualified specialists:

Dr. Eng. Mirel Nechita

Computational Fluid Dynamics

Dipl. Eng. Paul Boazu

Conceptual Design and Naval Architecture

Dipl. Eng. Gabriel Necula

Marketing Counseling and Naval Architecture

Ovidiu 5, Bloc M12, Apt. 16 Galati 800080 Romania

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Ovidiu 5, Bloc M12, Apt. 16 Galati 800080 Romania

To contact us:


Dr.Eng. Mirel Nechita


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Body lines fairing

Ship resistance and steady flow

Unsteady flow computations

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Sea keeping computations

Hull form improvement

Restoration of ancient hull forms

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Nonlinearcomputation

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Offshore hydrodynamics

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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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Hybrid Technology

Transverse view of faired hull form of a fishing vessel

Based on initial drawings of bodylines and/or loft book we combine the principal elements of the ship in focus and performing high quality lines fairing. Optionally we can also provide the surface generated consequently.


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Hybrid Technology

Discretization of hull surface for a fishing vessel


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Hull surface discretization < Return to Service List

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Having defined the surface of the hull surface (in some cases are necessary only the stations defined), we are able to discretize the hull surface in a structured grid for using it in different CFD codes the clients demand for their own purposes


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Hybrid Technology

Steady wave on a cargo ship computed with linear and nonlinear 3D Panel Rankine code

Using our own 3D Panel Rankine code (linear and nonlinear) we are able to perform computations for steady wave pattern and steady wave pressure distribution on the ships hull.

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.


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Ship Resistance and Steady Flow < Return to Service List


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Hybrid Technology

Contour plots of the diffraction wave produced by a cargo ship advancing in waves

Using our own code (called HYBRID) - based on Radiation/Diffraction 3D Panel method - we are able to compute the unsteady waves produced by the ship in her route thru the encountering waves.

Also the components of the unsteady pressure on the ships hull are computed.


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Hybrid Technology

RAO of Heave motion for a thin ship computed with different codes

The sea keeping computations are done by using codes based on Strip Method, and Rankine 3D Panel Method (linear and nonlinear).

The output of the codes will include Response 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.


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Offshore structure during operation at sea

The goal of this service is analyzing wave interactions with offshore platforms and other structures or vessels.

Combined Boundary Integral Equations are used as a tool for solving the velocity potential and fluid pressure on the submerged 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.


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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.


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Hull Form Improvement < Return to Service List

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Hybrid Technology

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.


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Restoration of Ancient Hull Forms < Return to Service List


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Published Papers 1. 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 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

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Services hybrid technology1