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Parallel Adjective High-Order CFD Simulations Characterizing SOFIA Cavity AcousticsThis paper presents large-scale MPI-parallel computational uid dynamics simulations for the Stratospheric Observatory for Infrared Astronomy (SOFIA). SOFIA is an airborne, 2.5-meter infrared telescope mounted in an open cavity in the aft fuselage of a Boeing 747SP. These simulations focus on how the unsteady ow eld inside and over the cavity interferes with the optical path and mounting structure of the telescope. A temporally fourth-order accurate Runge-Kutta, and spatially fth-order accurate WENO- 5Z scheme was used to perform implicit large eddy simulations. An immersed boundary method provides automated gridding for complex geometries and natural coupling to a block-structured Cartesian adaptive mesh re nement framework. Strong scaling studies using NASA's Pleiades supercomputer with up to 32k CPU cores and 4 billion compu- tational cells shows excellent scaling. Dynamic load balancing based on execution time on individual AMR blocks addresses irregular numerical cost associated with blocks con- taining boundaries. Limits to scaling beyond 32k cores are identi ed, and targeted code optimizations are discussed.
Document ID
20160006398
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Barad, Michael F. (NASA Ames Research Center Moffett Field, CA United States)
Brehm, Christoph (Science and Technology Corp. Moffett Field, CA, United States)
Kiris, Cetin C. (NASA Ames Research Center Moffett Field, CA United States)
Biswas, Rupak (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
May 18, 2016
Publication Date
May 16, 2016
Subject Category
Instrumentation And Photography
Fluid Mechanics And Thermodynamics
Report/Patent Number
ARC-E-DAA-TN27146
Meeting Information
Meeting: International Conference on Parallel Computational Fluid Dynamics
Location: Montreal, Quebec
Country: Canada
Start Date: May 17, 2015
End Date: May 20, 2015
Sponsors: McGill Univ.
Funding Number(s)
CONTRACT_GRANT: NNA10DF26C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
CFD
Parallel
SOFIA

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