Parallel high accuracy CFD code for complete aircraft viscous flow simulations

Abstract

This chapter presents an efficient parallel implementation for the high-accuracy three-dimensional serial industrial multiblock full Navier-Stokes/Euler System (NES) solver on a multiple instruction, multiple data (MIMD)-architecture cluster. The code solves the full Navier-Stokes equations and it is capable of performing large-scale computations for practical configurations in industrial environment. The parallelization strategy is based on the geometrical domain decomposition principle, and on the overlapped communication and computation concept. The important advantage of the strategy is that the suggested type of message-passing ensures a very high scalability of the algorithm from the network point of view, because, on average, the communication work per processor is not increased if the number of processors is increased. The parallel multiblock-structured Navier-Stokes solver based on the parallel virtual machine (PVM) routines is implemented on 106-processors distributed memory cluster managed by the MOSIX software package. Analysis of the results exhibits high level of parallel efficiency of the computational algorithm. This allows the reduction of the execution time for large-scale computations employing 10 million of grid points, from an estimated 46 days on the SGI ORIGIN 2000 computer to 5–6 hours on 106-processors cluster. The chapter concludes that the parallel multiblock full Navier-Stokes code can be successfully used for large-scale practical aerodynamic simulations of the complete aircraft on millions-points grids in cruise as well as take-off and landing regimes on a daily basis, as needed in industry.