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Foil 8 The First Two Simplifications of the NAS Parallel Benchmarks

From Introduction to Physics and Numerics of NAS Benchmarks CPSP713 Case studies in Computational Science -- Spring Semester 1996. by Geoffrey C. Fox
1 1)Absence of Realistic Boundary Conditions:
  • In a real CFD code,one would normally transform from a complicated physical domain into a computational domain where regular (structured) grid is appropriate. This transformation increases comptational complexity and storage requirements of real codes.
2 2)Simplified artificial dissipation
  • The benchmark adds a simple linear fourth order "artificial dissipation" term. In real codes an adaptive (dependent on pressure changes) mix of nonlinear second and fourth-difference terms are used. This simplification does not change computational structure significantly.
  • Artificial Dissipation is used to improve numerical stability of solver. The benchmark is designed to be very stable with more dissipation than normal.
in Table To:

Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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