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Research in Parallel Algorithms and Software for Computational Aerosciences
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1996-04-01
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NTL Classification:NTL-AVIATION-AVIATION
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Abstract:Phase I is complete for the development of a Computational Fluid Dynamics
with automatic grid generation and adaptation for the Euler
analysis of flow over complex geometries. SPLITFLOW, an unstructured Cartesian
grid code developed at Lockheed Martin Tactical Aircraft Systems, has been
modified for a distributed memory/massively parallel computer environment. The
parallel code is operational on an SGI network, Cray J90 and C90 vector machines.
SGI Power Challenge, and Cray T3D and IBM SP2 massively parallel machines.
Parallel Virtual Machine (PVM) is the message passing protocol for portability
to various architectures. A domain decomposition technique was developed which
enforces dynamic load balancing to improve solution speed and memory requirements.
A host/node algorithm distributes the tasks. The solver parallelizes very
well, and scales with the number of processors. Partially parallelized and
nonparallelized tasks consume most of the wall clock time in a very fine grain
environment. Timing comparisons on a Cray C90 demonstrate that Parallel
SPLITFLOW runs 2.4 times faster on 8 processors than its non-parallel
counterpart autotasked over 8 processors. Funded by NASA Ames Research
Center under contract NAS2-14057.
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