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NAS TECHNICAL NEWS
OVERFLOW Improvements Accelerate Some Simulations
11.29.07
The NASA Advanced Supercomputing (NAS) Division recently completed significant improvements to the OVERFLOW computational fluid dynamics (CFD) code, used across the agency for simulating complex flows with high fidelity.
Improvements include the extension of transonic, slender-body performance to high-speed, complex configurations, and significant robustness enhancements for lower-speed flows with high-speed jets. The increased robustness has already paid significant dividends for analyzing the shuttle and next-generation Orion space vehicle designs.
Aerospace engineers at NASA Ames and Johnson have used the improved OVERFLOW to compute flow around the Constellation Program's Launch Abort Vehicle configuration. In one recent study, a total of 212 different simulations were performed at various Mach numbers and angles of attack, and engineers achieved an order of magnitude improvement in solution convergence speed.
The improved CFD code has also been applied to Space Shuttle Orbiter calculations-in a case at Mach 4, NAS achieved a two-orders-of-magnitude reduction in processor time to converge the solution on the Columbia supercomputer.
For more information about this activity, please contact: Scott Murman, Scott.M.Murman@nasa.gov
For information about NASA and agency programs on the Web, visit
http://www.nasa.gov/home/
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