Abstract
This chapter provides a comparison of wall clock times obtained with the parallel FLOWer code with the sequential code. It discusses two problems: a three-dimensional Euler flow around a NACA0012-wing and a flow around a wing-body configuration. Both grids are divided into several blocks, so that the performance on a vector computer can be compared with the performance on a parallel machine. Existing sequential production codes have been parallelized with a high-level communications library for industrial codes (CLIC). For three-dimensional test problems the performance of the computational fluid dynamics (CFD) code FLOWer on vector and parallel computers has been evaluated. A large wing-body Navier-Stokes test example with more than 6 million grid points is solved. The chapter presents the results on the multiple instruction multiple data (MIMD) computers: IBM SP2, NEC Cenju-3, and Intel Paragon. Wall clock times are also known for some vector machines, such as a Cray C90 with 12 processors, a Cray J90 with 8 processors, and an NEC SX3.
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