Analyses of some numerical issues in compressible LES

B. Chernyavsky, H. Yan, D. Knight

Research output: Contribution to conferencePaperpeer-review

Abstract

Two important numerical issues associated with the development and implementation of compressible LES on an unstructured grid are limiters for efficient shock capturing and scalability for parallel execution. The implementation of an ENO stencil is discussed and the results are compared with an earlier inhomogeneous limiter scheme. It is shown that the ENO stencil is able to capture the shock more precisely for the Riemann shock tube case. The developed ENO scheme has been succussfully applied to a 25° compression corner at Mach 3. Scalability issues associated with parallelization of LES and its implementation on a PC-based cluster are discussed. It is shown that speedup for a sufficiently large grid remains acceptable for up to 48 processors. Scaled speedup data for up to 64 processors are provided and discussed. It is shown that for a reasonably large grid the LES code does not saturate the lOOMbps network. Timing of individual code fragments is analyzed and the calculational time per step compared with interprocessor exchange time. The timing of Roe and Godunov inviscid flow solvers is compared.

Original languageEnglish (US)
DOIs
StatePublished - 2001
Event39th Aerospace Sciences Meeting and Exhibit 2001 - Reno, NV, United States
Duration: Jan 8 2001Jan 11 2001

Other

Other39th Aerospace Sciences Meeting and Exhibit 2001
Country/TerritoryUnited States
CityReno, NV
Period1/8/011/11/01

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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