Actions for Application of Fast Multipole Methods to the NASA Fast Scattering Code

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Application of Fast Multipole Methods to the NASA Fast Scattering Code

Author
Tinetti, Ana F.
Published
May 05, 2008.
Physical Description
1 electronic document
Additional Creators
Dunn, Mark H.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
The NASA Fast Scattering Code (FSC) is a versatile noise prediction program designed to conduct aeroacoustic noise reduction studies. The equivalent source method is used to solve an exterior Helmholtz boundary value problem with an impedance type boundary condition. The solution process in FSC v2.0 requires direct manipulation of a large, dense system of linear equations, limiting the applicability of the code to small scales and/or moderate excitation frequencies. Recent advances in the use of Fast Multipole Methods (FMM) for solving scattering problems, coupled with sparse linear algebra techniques, suggest that a substantial reduction in computer resource utilization over conventional solution approaches can be obtained. Implementation of the single level FMM (SLFMM) and a variant of the Conjugate Gradient Method (CGM) into the FSC is discussed in this paper. The culmination of this effort, FSC v3.0, was used to generate solutions for three configurations of interest. Benchmarking against previously obtained simulations indicate that a twenty-fold reduction in computational memory and up to a four-fold reduction in computer time have been achieved on a single processor.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20080018646.
14th AIAA/CEAS Aeroacoustics Conference; 5-7 May 2008; Vancouver; Canada.
Terms of Use and Reproduction
Copyright, Distribution under U.S. Government purpose rights.
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