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Spectral Element Method for the Simulation of Unsteady Compressible Flows
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Author and Affiliation:
Diosady, Laslo Tibor(Oak Ridge Associated Universities, Inc., TN, United States);
Murman, Scott M.(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: This work uses a discontinuous-Galerkin spectral-element method (DGSEM) to solve the compressible Navier-Stokes equations [1{3]. The inviscid ux is computed using the approximate Riemann solver of Roe [4]. The viscous fluxes are computed using the second form of Bassi and Rebay (BR2) [5] in a manner consistent with the spectral-element approximation. The method of lines with the classical 4th-order explicit Runge-Kutta scheme is used for time integration. Results for polynomial orders up to p = 15 (16th order) are presented. The code is parallelized using the Message Passing Interface (MPI). The computations presented in this work are performed using the Sandy Bridge nodes of the NASA Pleiades supercomputer at NASA Ames Research Center. Each Sandy Bridge node consists of 2 eight-core Intel Xeon E5-2670 processors with a clock speed of 2.6Ghz and 2GB per core memory. On a Sandy Bridge node the Tau Benchmark [6] runs in a time of 7.6s.
Publication Date: May 17, 2013
Document ID:
20130014037
(Acquired Jul 24, 2013)
Subject Category: FLUID MECHANICS AND THERMODYNAMICS
Report/Patent Number: ARC-E-DAA-TN9710
Document Type: Conference Paper
Meeting Information: 2nd International Workshop on Higher-Order CFD Methods; 27-28 May 2013; Cologne; Germany
Contract/Grant/Task Num: NNH06CC03B
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: Oak Ridge Associated Universities, Inc.; TN, United States
Description: 11p; In English; Original contains color illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: COMPUTATIONAL FLUID DYNAMICS; GALERKIN METHOD; INVISCID FLOW; MEMORY (COMPUTERS); NAVIER-STOKES EQUATION; PLEIADES CLUSTER; RUNGE-KUTTA METHOD; SUPERCOMPUTERS; UNSTEADY FLOW
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