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Nagoya Municipal Industrial Research Institute
Helping Local Companies Solve Thermal Issues with CFD Tools


Nagoya Municipal Industrial Research Institute (NMIRI) is a public research institute in Nagoya city that provides test and analysis support to small/medium sized companies in cooperation with local industries. When the client's work involves thermal management, the engineers at NMIRI use Software Cradle simulation tools to perform the simulations. The engineers also use these tools for their own basic research and to verify the performance of test instrumentation.


Fig. 1 Nagoya Municipal Industrial Research Institute

Fig. 3 Flow field around air-cooling fan

Growing Demands for Higher Accuracy of Analysis

 The demand for increasing accuracy and the detail of the modeled electronic parts continues to grow. While part geometries can be examined using the institute's x-ray machine, the part's internal material characteristics and properties are not visible using this technique. The engineers at NMIRI realized that internal material properties, heat capacity, and thermal resistance could be estimated more accurately if trends of these parameters can be developed. This is done by first presuming the inner structure of the part. Then graphs of heat capacity and thermal resistance are developed. The engineers change the materials and compare the simulation results with the experimental results. Following this process, they are able to predict the internal material of the parts more accurately.

 At one time, the engineers at NMIRI used to receive simple requests to measure the thermal conductivity of an individual part and estimate the part materials. However, today many clients want more detailed simulations and verification of the parts internal materials. Mr. Kajita says, "Most companies struggle to model parts for simulation, so we feel our support of their modeling efforts is very important."

Flexible Data Application

 Over the years, NMIRI has worked with many different software products. One of the things Mr. Kajita appreciates about Software Cradle products is their flexible output methods. For example, if the analyst wants to save a full transient solution, the output data file will be very large. As a result, often only necessary data is saved. With Cradle software products, a designated section of the data can be saved. This can be an average temperature in a particular region or for a specified time. Users can consider available memory capacity and define their output accordingly.

 Cradle's technical support team also provided NMIRI with assistance. The Cradle staff quickly responded to inquiries and proposed alternative approaches. Mr. Kajita says, "Cradle always responded to our requests and requirements quickly. This was a major advantage compared to other software companies."

 Mr. Kajita goes on to say, "The use of simulation enables the engineers at NMIRI to do what they could not do before. They could not predict thermal issues only by tests and experiments. However, with simulation, they can freely change the material and conditions. This has resulted in significant benefit."

 With the growing recognition of simulation and its use, NMIRI has used the products to discuss and support needs of their clients, who had started using simulation on their own. This has led to another benefit. NMIRI engineers have been able to focus on advanced analyses while using models that were created by their clients.

Expectations for Coupled Analyses

 NMIRI has asked Cradle to provide additional support to improve the software. This includes the ability to accept legacy models that are more than two versions old into the latest version of the software. This will enable the engineers to use the latest capabilities of the software while working with older models.

 Mr. Kajita also feels that multiphysics is becoming increasingly important based on his work with a number of companies. He would like Cradle to excel in this development as well. Mr. Kajita says, "Rushing development may result in unwanted functionality and software that is not easy to use. We strongly hope that Cradle will take the time to develop un-rivalling high quality multiphysics capabilities.”

More Opportunities for Simulation Software

 Engineers in the electronics industry face many thermal challenges as electronic devices become smaller and lighter. While simulation is ideal for addressing these challenges, Mr. Kajita feels that, despite the growing popularity of CFD tools, only a few actually use the tools. He believes that for many of his clients, their designers lack basic knowledge of fluid and heat transfer. Even though they work closely with NMIRI, they still have difficulties solving their heat transfer problems.

 To help resolve this deficiency, Mr. Kajita plans to offer a series of seminars designed for those who have never used simulations tools. The emphasis of the seminars will be to familiarize the designers with how to use the tools to solve thermal problems. Mr. Kajita says, "The actual operation of CFD software can significantly help inexperienced designers understand thermal issues much more effectively than by looking at the numerical expressions." He also thinks that simulation software is not well established with respect to application, modeling method, and utilization. One of his personal objectives is to continue his studies to improve these issues.

 At the same time, Mr. Kajita is always looking for collaborators who will work with him to conduct this extensive research. He believes CFD tools have plenty of room for further research. By advancing the technology, NMIRI will continue to provide valuable and dependable services to their clients.

*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Contents and specifications of products are as of August 1, 2013 and subject to change without notice. We shall not be held liable for any errors in figures and pictures, or any typographical errors.

Institute Details


Nagoya Municipal Industrial Research Institute
Established 1935
Operation started 1937 as Nagoya City Industrial Guidance Center
Business Technical support for small and medium-sized companies
Location Nagoya city, Aichi, Japan



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