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Nikken Sekkei Ltd
Assisting Architectural Designs with a Variety of Simulations Using scSTREAM


In January 2012, Nikken Sekkei, one of the leading institutional architect offices in Japan, organized the Digital Design Project, a new project for supporting Building Information Modeling (BIM). The company had supported BIM in the past, and the organization of the new project was for gaining more momentum. One of the focal points in this effort is the BIM in terms of environmental/facility designing utilizing simulations, which is carried out by the Computer Aided Simulation (CAS) team in the Digital Design Project. We interviewed Mr. Osamu Nagase, the leader of the CAS team from Mechanical & Electrical Engineering Department, about this effort.

Osamu Nagase
Nikken Sekkei Ltd. M&E Technical Section,
M&E Engineering Dept. Associate,
Digital Design Project member

Sony City Osaki / ©Yutaka Suzuki

Analysis Tool Becoming a Great Advantage as Designers Utilize it Themselves

  "In the BIO SKIN project, we used scSTREAM to evaluate its effect. Based on some measured data, we simulated that the temperature around the entrance would drop by two degrees C under a certain condition." In specific, the measured data was obtained from the experiments in Tokyo University. With that data, temperature simulations were performed for a summer day with a prevailing wind, while changing analysis conditions from half to full installation of the BIO SKIN on the wall. Of course, other buildings in the area were all modeled into the simulations, and surface temperature of nearby roads was taken into account as it would rise with the sunlight.

  "This project became the news because it involved the utilization of a new material in energy-saving technologies, which was thought to have run out of new topics. Our client is showcasing a mock-up and the simulation results at the entrance of the building for publicity." Nevertheless, Mr. Nagase believes that simulations can be and should be utilized for more projects and not just for a big project like the BIO SKIN. For example, designers can use simulations to test a design when they are in doubt about if it is actually feasible. Simulation results may offer understandings and insights that can be useful in future designs. With more of those experiences, it may become possible to sense if a design is feasible or not, and they will perform simulations only when it is necessary. For this reason, it is important for designers themselves to use simulation tools.


Temperature distribution of BIO SKIN
(summer, south wind, 2PM)

  "You can see something you couldn't see before by quantifying it using simulations. For instance, you can see how much effect an exhaust of heat from a chimney has on an external air intake. There is no doubt in my mind that analysis tools like scSTREAM become a great advantage for designers in supporting their designs, if they can use those tools themselves and feed back various parameters including temperature from analysis results. Of course, there is much to learn before that, especially because simulation results can vary depending on boundary conditions. Evaluating results about 'if they are really right' is more important (than results themselves). Securing the validity of results is an urgent matter in popularizing analysis tools like scSTREAM as design tools. For the future, we'd like to clear those matters one by one so we can promote our effort as the CAS team."

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​*Contents and speci cations of products are as of January 31, 2013 and subject to change without notice. We shall not be held liable for any errors in  gures and pictures, or any typographical errors.

Company Details

Nikken Sekkei Ltd
Established July 1950
Businesses Architectural design and management, urban planning and management, and related researches and consulting
President & CEO Kei-ichi Okamoto
Headquarters Chiyoda-ku, Tokyo
Capital 460 million yen
Number of personnel 1,724(2,387)



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