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Mooncraft Co. Ltd.
Leading Edge of Racecar Aerodynamics Development - Get Faster with CFD

[Vol. 2] Mooncraft is a racecar constructor and is known for its remarkable aerodynamic design. The company has been working on wind tunnel testing for more than 30 years, producing aerodynamically sophisticated racecars. The company has been always pursuing to create innovative products and has also introduced Computational Fluid Dynamics (CFD) in the early days. Mooncraft is working on analysis of vehicle internal and external flows using SC/Tetra.

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“As shown in the former examples, CFD simulation enables us to examine phenomena that cannot be observed in experiments, such as to find out pressure distribution and temperature under the floor. SC/Tetra can visualize surface flow behaviors. Simulations also helped us to validate if decisions made in wind tunnel testing were proper, such as whether air intake is allocated to the spots with high pressure.” says Mr. Sakaguchi.

“These results are open to public on our blog to demonstrate the aspiring strategy of Mooncraft, introducing the leading technology for the better products. We would like to highlight our advantage in aerodynamics development through the utilization of CFD.” Mooncraft also rents their wind tunnel facility. Mr. Sakaguchi says “Most people who rent our facility often use CFD beforehand and they come to us to verify that results, and so the knowledge about CFD is becoming more essential for us. Mooncraft did not have enough human resources and were not able to push CFD investigations, but they are now actively engaged in the operation.
 

Simple and Clear Operation Procedures

Mooncraft has dedicated computing resources for their CFD tasks. It used to take four days for one simulation. Mooncraft worked with the Cradle support team to optimize the run time to 14 hours.

Mr. Shinse is happy with SC/Tetra’s user-friendliness. “Using the built in Postprocessor we can visualize results in different, beautiful and interesting styles. The software is easy to operate, especially when importing and modifying a model on Prime mode. Even a beginner like myself can easily handle this software.” he says.

Mr. Shinse says that SC/Tetra’s wrapping function was very helpful to adjust the data that is not closed. This function helps him frequently as carbon products are treated as surface data, not as solid in CAD.

As a further request, he hopes to have help menu in HTML format for scFLOW (Software Cradle’s new thermo-fluid analysis tool introducing polyhedral mesh) instead of PDF format, which would enable him to find out what he needs more easily.
 

Analyzing Compressible Fluid of Complicated Intake Chamber

Mooncraft has been also analyzing the shape of an intake duct system (Figure 3). For a naturally aspirated engine, it is important to decrease pressure loss in an intake air stream. In SUPER GT, the participants are required to mount an intake restrictor due to the regulation. It is necessary to examine the shape of an air box to take air effectively. “The velocity of the air around restrictors becomes as fast as sound speed as enormous amount of air is initiated into the duct. Hence, the compressibility of air has to be considered for this flow case.” Mr. Sakaguchi says.

Figure 3: Analysis of intake restrictor of an engine
(click to enlarge)

Figure 3 shows an internal flow moving through from the restrictor, underfloor, to the intake manifold. In the analysis, density change and air pressure were captured and the shape was optimized.

Looking into the future, Mr. Shinse says, ” We would like to work on transient compressible fluid simulations of an intake box, which accounts for the ignition timing of the engine.”

He is also interested in implementing automated functions using Visual Basic interface.” That would allow them to simulate different car attitudes in one single operation.
Mr. Shinse comments: “We would like to use both wind tunnel experiments and CFD and make use of their advantages. For sure, while working on validation tasks between wind tunnel and CFD. SC/Tetra will help Mooncraft for their further success in aerodynamics development.

*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Unauthorized use and reproduction of content, text, and images of this material is prohibited.
*Contents and specifications of products are as of April 30, 2017 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



 

Mooncraft Co. Ltd.
Established 1975
Businesses
  • Design, R&D, and production of racing cars
  • Aerodynamic experiments and development using wind tunnel experiments
  • Rental of wind tunnel facility
President & CEO Takuya Yura
Location Gotenba-shi, Shizuoka, Japan

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