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Enhancing Ship Design through Combinational Use of CFD (Computational Fluid Dynamics) and Extensive Data

[Vol.1] Fluid Techno has cultivated advanced technologies for designing ships, providing ship-related manufacturing and training services, and developing ship-specific energy saving devices. Faced with the need to improve energy efficiency, they use Software Cradle SC/Tetra CFD software to develop more capable products in a shorter period of time.

Picture 1: Mr. Masahiro Tamashima(Dr.Eng.), President

From Hull Design to Ship Development Support Programs

Fluid Techno was founded in 2001 in Sasebo-shi, Nagasaki (Japan) and is a provider of ship design services and development support. Mr. Masahiro Tamashima, the President (Picture 1) had acquired extensive experience in ship design and experiments prior to establishing the company. Drawing upon Mr. Tamashima’s background and experience, Fluid Techno has their strengths in experience and accumulation of extensive data.

One of their business activities is ship design. Shipbuilders and ship owners contract Fluid Techno to design the hulls for a variety of ships. These range from large ships, such as very large crude carriers (VLCCs), to small and mid-size ships. Fluid Techno specializes in conceptual and preliminary designs; If likened to home design, Fluid Techno would be involved with general, up-front decisions such as whether the home will be a condominium or detached house, what shape the roof should be, and how the rooms should be laid out. This contrasts with detailed design, which, for the home example, involves determination of details such as wiring and interior decorating.

Figure 1: Eco-Stator, an energy saving stator (on left)
Reduces fuel use by 3 – 4 % for small to mid-size ships and 2 – 3 % for large ships. It has been implemented in several applications Flow in cross-sections of stern (on right) Implementation angle of Eco-Stator is determined by condition of vortices.
(Click to enlarge)

Fluid Techno also developed Eco-Stator, a patented marine energy saving device (Figure 1), and provided implementation services of the device when fuel efficiency goals cannot be achieved just by the original hull geometry. Eco-Stator can be installed in front of the ship propeller to improve propulsive performance by 3 - 4 % for small to mid-size ships and 2- 3 % for large ships. Eco-Stator has been implemented on more than 250 ships.

Another Fluid Techno capability is model ship design for experiments. To meet navigational requirements, experiments must be conducted using ship models. Fluid Techno offers not only special skills necessary to properly install measurement instruments inside the ship models, but also design related software programs and software for data calculations during experiments. For example, when cargo is moved by a crane from a barge (a flat bottomed boat without engines that carry heavy cargo in port or river) to a wharf, the barge position will waver due to the water motion. One Fluid Techno program calculates the acceleration at specific locations to take account for this effect. Fluid Techno also develops pre-/post-processors for fluid solvers developed by universities and research institutes.

​Demand for Improved Energy Efficiency as a Driving Factor

It was the increasing demand for improving fuel efficiency that necessitated Fluid Techno to introduce SC/Tetra CFD simulation software. Most ships are designed to carry as much cargo as possible with minimum fuel usage. “As it has always been, keeping the fuel usage at minimum is the endless challenge for design engineers,” says Mr. Tamashima.

Picture 2: Mr. Takeaki Tamada, Technical Chief Manager

The demand for improved energy efficiency has gained prominence because of environmental concerns in addition to economics. Three tons of carbon dioxide is generated for each ton of fuel burned. To drive improvements, in 2013, the International Maritime Organization (IMO) began to impose regulations based on the Energy Efficiency Design Index (EEDI). Targeting ocean-going ships (come and go between nations) that exceed 400 tons, the regulation is applied to the amount of carbon dioxide generated per mile per ton of cargo. “Most of the ships we work with are subject to this regulation. I think that environmental measures will be imposed on domestic ships in the future,” says Mr. Takeaki Tamada, Technical Chief Manager at Fluid Techno (Picture 2). While regulations impose greater demands on design development, Fluid Techno sees this trend as an opportunity. “The design of the underwater section of hull is critical for improving ship performance. Our experience and knowledge will be of great use in such situations,” says Mr. Tamashima.

Figure 2: Experiment using model ship
Facilitated to measure force acting on rudder using propeller and rudder only

To obtain EEDI certification, experiments must be conducted using a model ship (Figure 2) at one of seven test facilities in Japan. Besides, the experiments are in a large scale and very costly. “CFD tool is indispensable for firms without experiment facilities like us,” says Mr. Tamada.

*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Contents and specifications of products are as of February 29, 2016 and subject to change without notice. We shall not be held liable for any errors in figures and pictures, or any typographical errors in this brochure.

Company Details


Founded 2001
Business Provides ship design and development support including model ship designs for experiments, test services for ship experiments, and software programs for calculating ship performance. Provides design and implementation services for ship energy saving devices.
Head Office 6F Gibraltar Seimei Bldg., Tokiwa-cho, Sasebo, Nagasaki Japan
Representative Masahiro Tamashima, President



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