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Tomo PE Jp Office
Tomo PE Jp Office Choose MSC Cradle CFD to Improve their CFD Modeling and Hypersonic Analysis Proces

[Vol. 2] SC/Tetra, a thermo-fluid simulation Software from Cradle is an indispensable analysis tool for Tomo PE Jp Office, a consulting services company that focuses on innovative CFD technologies. We interviewed the CEO, Teruhiko Tomohiro. He has been involved in research and development of various fan types from both aspects of experiments and simulation for many years. We also asked him about the recent analysis examples and expectations for CFD tools.

Picture 1: Mr. Teruhiko Tomohiro, Professional Engineer (Mechanical Engineering, Information Engineering), Tomo PE Jp Office

Predicting Ultrasonic Waves in a Flow Field

Other than development of fans, as a secondary project, Mr. Tomohiro studies the propagation of ultrasonic waves using fluid analysis tools. Although several tools are available for analysis of ultrasonic waves, most of them do not account for flows, especially for wave propagation in a solid.

 

Sounds are compression waves that move through a medium. Knowing this, Mr. Tomohiro believed that commercially available CFD tools are capable of solving the problem of ultrasonic waves in a compressible fluid analysis.

Figure 4: Propagation of ultrasonic waves in a fluid A transient analysis has been performed at the ultrasonic wave frequency of 40 kHz, to simulate the generation of ultrasonic waves. The inflow and outflow of the fluid are generated from the vibrating wall regions (click to enlarge).

“Experiments were not enough to know how ultrasonic waves change while they propagate in a flow, and how the change affects ultrasonic waves if a flow changes.” Mr. Tomohiro continues: “Although simulation accuracy is necessary, I want to use CFD tools for qualitative approaches, for example to know what flow change influences the propagation of ultrasonic waves.”

 

 

Figure 4 shows a pressure contour map of ultrasonic waves traveling through a gas fluid enclosed in a chamber with square walls. A transient analysis without any flow was performed at the frequency of 40 kHz. The vibrating wall regions are considered as the source condition for ultrasonic waves, resulting in generation of fluid inflow and outflow. From the figure, we can clearly observe that the wave propagation, reflection, and diffraction are well predicted using simulation.

 

Mr Tomohiro and his team faced some challenges when using CFD tools to simulate ultrasonic wave propagation: “I do not know what is correct because I use the tool in a specific way.” Mr. Tomohiro says. The implementation of commercial CFD tools to study sound dates back to early 2000s.

 

According to Mr. Tomohiro “CFD tools in the past were not designed to be used for ultrasonic wave analyses. The pressure change of sound is much smaller than that of a flow. As such, a CFD program needs to have the appropriate capability to accurately capture the change. Today, we can obtain qualitative results to some extent. For now, I cannot say the commercial tools are useful enough for aerodynamic noise simulations. However, I want to make it practical.”

 

Functions and Accuracy Enough for Analysis Task

Utilizing SC/Tetra has helped Mr. Tomohiro and his team to reduce the number of experiments and obtain a better understanding of the fluid sound sources. “As far as my business concerns, SC/Tetra has useful functions and provides high accuracy.” Before starting his own company, Mr. Tomohiro performed both experiments and simulations, but he has no environment for experiments now. Therefore, the team inevitably uses SC/Tetra for their consulting projects. In a sense, SC/Tetra is very helpful.

 

Back in 2016 Software Cradle released scFLOW, a new thermo-fluid analysis software equipped with polyhedral mesh. scFLOW is a progressive version of SC/Tetra that provides a more advanced solver with higher calculation speeds.

Mr Tomohiro is confident in the accuracy of results provided by both scFLOW and SC/Tetra. “I’m expecting to obtain the same analysis result in scFLOW if I use the same model with SC/Tetra. I’m counting on scFLOW to succeed SC/Tetra.”

 

AI Support for Large-Scale CFD Calculations

As for the future of CFD tools, the next big trend is to support automation process for large-scale calculations. “The number of elements increases to several thousand or even millions when working with complex CFD models. It is hard to even load or output data, even if a high-performance computer is used. In addition, new methods must be taken into account. In some cases, analysis results can be compressed.” Mr. Tomohiro says.

 

He also believes that utilizing AI can improve the efficiency of data analysis process. “Many engineers are interested to decrease resistance and loss in fluid flow of a fan or a duct. We can display a region with large loss from the newly obtained analysis data or use different colors to identify the causes of loss by learning from past analysis results. CFD tools that can that use AI will be very useful for design engineers in the development site.”

 

Professionals Who Know the Actual Design Process as well as Simulations

Mr. Tomohiro hopes to see more engineers that are proficient in CFD modeling and simulations while experienced in testing and design process. “Most software companies offer engineering advice to the users and are experts in running CFD simulations. However, those that are involved in the actual design process or testing stage, can greatly improve the quality of services provided to their customers.” Some users only focus on running simulations without getting involved in the design process. “The services provided by the vendors who know the design site will be very helpful for such users, as well”

 

Although Tomo PE Jp Office works on many CFD related subjects, their main focus is on development of various types of fans. They have interesting case examples and expectations for the evolution of scFLOW. Software Cradle will continue to implement innovative CFD functions in respond to these expectations.

*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Contents and specifications of products are as of January 31, 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

 

Tomo PE Jp Office
Established April, 2011
Business Consulting on research, development, and design of fans
Consulting on computational fluid analyses
President & CEO Teruhiko Tomohiro
Head Office Ikoma City, Nara, Japan

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