Simulating complicated wind flows around buildings and the surrounding environment used to mean conducting wind tunnel tests that required a long time, large-scale facilities, and skilled experts. Now, many of the experimental tests are being replaced by computational fluid dynamics (CFD) simulations. Combining these two approaches draws on the advantages of each and is commonly done in engineering today. But Mr. Tetsuo Matsuyama from WindStyle Corporation, who has used scSTREAM for many years, envisions additional opportunities for CFD. He explains how using scSTREAM proactively to interpret wind flow can change design processes and building management.
WindStyle Corporation is a company of consulting specialists for wind engineering. Mr. Tetsuo Matsuyama, the president and CEO, originally studied under wind engineering researcher Professor Eizo Maruta from Nihon University's Department of Architecture and Architectural Engineering, College of Industrial Technology. Mr. Matsuyama investigated wind simulation that used wind tunnel testing. He first learned about scSTREAM while he was at the Kumagai Gumi Co., Ltd., one of the largest Architecture Engineering and Construction firms in Japan. Mr. Masuyama joined Kumagai Gumi as a wind engineer in 1998. “scSTREAM was available at the company's technology laboratory but it was not fully utilized,” recalls Mr. Matsushima. “I felt a spark of inspiration and thought that this was an interesting approach to investigate further. I started using the software and realized that the hardware capability wasn’t good enough to generate realistic results.” Despite the hardware inconveniences, Mr. Matsuyama kept using the software. “Back in time, I could only briefly simulate the overall flow field pattern with one million elements. Still, I knew there was more to it. I was convinced that the use of simulation would become more dominant than wind tunnel testing in near future.” Mr. Matsuyama left Kumagai Gumi in 2003 to start own company, but has continued to use scSTREAM in his consulting business for wind related projects.
One of Mr. Matsuyama's interests involves evaluation of wind around high-rise residential and office buildings. The requests for this work come from commercial real estate companies and general contractors who need to know if environment will be adversely affected after the completion of building construction. Mr. Matsuyama uses wind simulations to report the results and make recommendations.
To simulate the wind environment near a building using scSTREAM, several factors other than the planned building, must be properly represented in the model. These include the surrounding buildings, trees, green, and geographical features. Objects close to the planned building must be represented more accurately than those located further away. As the size of the planned building becomes larger, so does the size of the surrounding area that must be included in the computer model. Mr. Matsuyama believes that carefully defining these conditions and parameters facilitate the initial settings. His team collects geographical data from resources such as aerial surveys and Google Earth. Photographs of the surrounding environment and their model based on the collected data, which is converted to the STL file format. The scSTREAM preprocessor is used to generate meshes and set properties and boundary conditions. Calculations follow as shown in Figures 1 and 2.
Mr. Matsuyama uses the Murakami criteria for evaluating and characterizing the wind environment. The Murakami criteria is based on the frequency of wind occurrence. The criteria is used to forecast the number of days where the maximum instantaneous wind speed exceeds 10, 15, and 20 m/s. It ranks the strength of the wind environment on a scale from 1 to 4. Mr. Matsuyama uses CFD simulation with scSTREAM to observe the effects of the changes in the wind environment on the building model across a multitude of directions (16 compass points). Analyses must be conducted for at least 32 cases, assessing the impact of the environmental conditions before and after the construction of the planned building is complete.
|Business||Research and development of wind engineering related technology, and provision of technical services and support|
|Representative||Tetsuo Matsuyama, President and CEO|
|Locations||Head Office in Niigata-shi, Niigata, Japan
Narashino STUDIO in Narashino-shi, Chiba, Japan
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