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Application Examples

Payette
The Accurate CFD Software that Throttles Up
Building Design and Energy Modeling Processes

Picture 1: Duke University’s Environment Hall designed by Payette
Photography(c) Warren Jagger Photography

Payette, an award-winning architectural design firm located in Boston with 165 employees, specializes in high technology building design for science institutions, healthcare, and research facilities. With the emphasis on technology the firm’s projects often feature energy efficiency, naturally ventilated spaces, or a thermal corridor. Payette’s projects include the Duke University’s Environment Hall (Picture 1), George Washington University’s School of Public Health, and many more, all of which were recognized for design excellence. Payette has used scSTREAM CFD software since 2013.

Easier, Quicker and Better Features

She also pointed out that the ease of geometry and mesh generation was one of the strengths of scSTREAM. “The ability to easily import Rhino and SketchUp geometries was a big advantage that we were not even originally considering. This saves me a lot of time, and allows us to model exactly what architects need to be modeled. The several meshing options offered by scSTREAM are something we had not seen in other software within our price range. Meshing has never been easier,” she said. Furthermore, one of the features Dr. Menchaca really liked was the scSTREAM GUI. “This is where scSTREAM was probably the most superior compared to other CFD packages. The scSTREAM interface is very intuitive and defining boundary conditions – often the most painful part of setting up a simulation – is extremely simple. I tend to skip ‘wizards’ in most software, but scSTREAM’s external airflow simulation wizard is a true time saver.” The external airflow simulation wizard sets the boundary conditions for all six computational boundaries with only a couple of clicks and typed inputs.

When Dr. Menchaca talks about simulation time she says “we cannot afford to run week-long simulations, although while we are still waiting for the perfect day when CFD simulations take one minute to complete, scSTREAM simulation times are relatively short.” Because of scSTREAM's reasonable cost and efficient performance Dr. Menchaca could run a simulation on her laptop if needed. This enabled her to continue running jobs when she was away from her office.

Figure 2: Results of an external wind flow study post-processed in scSTREAM - perspective view (above) and top view (below).
​Click to enlarge.

The way scSTREAM processes the data from an analysis makes it easy to visualize the results. Dr. Menchaca first mentioned scSTREAM’s user-friendly interface and explained that user-friendly, high quality post-processing capabilities are critical for architectural firms like Payette. scSTREAM’s post-processor enables users to instantly create surfaces, planes, volumes, streamlines, animations, dynamic views and much more. “Post-processing options seem to be endless,” she said. “I often use streamlines with semi-transparent arrows, overlaid on contour plots (Figure 2). I also like the particle animations and all animations in general, which make it easy to convey results to people in the office. My students discovered the ability to record videos of their animations, which was mind-blowing.” She continued, “another priceless feature is that I can visualize several outputs and compare them, side by side or as an animation.” Of all the scSTREAM post-processing features, Dr. Menchaca thought one of the most helpful was Status File, which saves post-processing settings including viewpoint, geometry modification, image plots and graphs. It can then retrieve them into any post-files.

 

One last thing Dr. Menchaca liked about scSTREAM was Cradle’s dedicated technical support, which ultimately convinced her to select scSTREAM. “The quality, and most importantly, quick response offered by Cradle’s technical support has allowed us to overcome problems and bugs in a matter of hours, compared to the several days that one needs to wait with other firms.”

CFD Analysis at a Design Firm and the Future of CFD for Architecture

CFD analysis is known to help designers and engineers understand and improve their architectural designs. However, practitioners in the architectural field often say they are hesitant to commit to CFD. Dr. Menchaca provided her thoughts on this matter. “I think the current usage of CFD in the architecture industry has not reached its full potential. Because of cost, time and expertise required, running a CFD simulation means waiting for at least a month to get an answer to any questions.” The time required to perform a CFD analysis is certainly an issue that affect the role of CFD in the design processes. According to Dr. Menchaca, time is an even greater constraint when the architectural firm outsources the CFD work to a supplier. “By the time the CFD results are received, the building is likely to have changed dramatically. This means that, in general, we will only outsource CFD studies for building elements that are less critical.” In contrast, the situation is entirely different at Payette where building scientists conduct energy modeling and CFD analysis alongside their design team. Dr. Menchaca described the benefit of having CFD capabilities in-house. “Having CFD capabilities in-house allows us to speed up the simulation process to a week or so, and also allows us to tweak and explore more options as the design evolves.”

 

She also explained some of the differences between the current design process and the past. “Our office used to hire outside consultants to evaluate indoor thermal comfort conditions or to conduct wind studies, studies which usually require about one month to get results. Now we do most of the early design simulations in-house, which has allowed us to use the results to modify the building design. This saves us both money and valuable time.”

 

CFD will make greater contributions to the architectural industry as technology continues to improve “the easier and quicker it becomes to run accurate CFD simulations, the more CFD will be used as a tool that impacts building design, rather than an afterthought.” Dr. Menchaca compared this to the way energy modeling has slowly become more common in the early design stages and now impacts the design process.

 

Lastly, Dr. Menchaca was asked about one feature she would like to test with scSTREAM. “I have not had the chance to really test particle dispersion, which is extremely relevant for us, particularly in the healthcare practice. Also, I would like to run parametric tests with scSTREAM, to evaluate several design options without having to set each case up, just like the Wind Tool does when it tests several wind directions.”

 

Dr. Menchaca's application example of scSTREAM indicates that scSTREAM will play even more significant role in building design in future.

​​*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Contents and specifications of products are as of October 31, 2014 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

 

 

 



     

Payette
Founded 1932
Business Architectural design
President Kevin Sullivan, FAIA
Size 165 employees (as of October 2014)
Location Boston, MA, USA
URL http://www.payette.com

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