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NAS TECHNICAL NEWS
NAS Enhances USM3D Code, Enabling Increased Fidelity Simulations
08.02.07
The NAS Division has further enhanced performance of the aerodynamic analysis code USM3D, improving runtime of large simulations by a factor of two over the previous best time attained on the Columbia supercomputer.
This significant improvement was achieved by rewriting memory allocation logic, coupled with modifications to efficiently buffer input/output files. These improvements have the added benefit of allowing USM3D to run significantly larger problems -- previously, the code failed at attempts to run problems larger than about 50 million grid points. Now, the code routinely handles 72 million point simulations, and will soon be used to complete a 107 million point Boeing 777 study.
The need to rapidly run large aerospace problems (more than 50 million grid points) has become a high priority for the USM3D user community. The code is seeing high demand in Crew Exploration Vehicle and Crew Launch Vehicle studies, among others.
NAS' ultimate goal is a ten-fold reduction in code runtime and a two-fold reduction in memory requirements for this benchmark case by the end of 2007, translating into even greater improvements for larger cases.
USM3D was originally developed by Neal Frink at NASA Langley, where a development team continues to make major feature and fidelity enhancements to the code, while applying it to a growing list of important NASA applications.
For more information about this activity, please contact: Jim Taft, jtaft@nas.nasa.gov
For information about NASA and agency programs on the Web, visit
http://www.nasa.gov/home/
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