Using massively parallel computer systems for numerical simulation of 3D viscous gas flows

Abstract

This chapter presents numerical simulation of oscillating regimes of supersonic viscous compressible gas flow over the 3D cavity with the aid of the explicit kinetically consistent finite difference schemes using different multiprocessor computer systems. The essential features of flow structure and properties of pressure oscillations in critical body points are discussed. The original algorithms were used named kinetically consistent finite difference (KCFD) schemes. There is close connection between them and quasigasdynamic (QGD) equation system. QGD equation system may be considered as some kind of differential approximation for KCFD schemes. The calculations were accomplished on rectangular grid with the total number of cells near 6,40,000. Detailed information of 3D gas flow around the open cavity was obtained for different angles of incidence. The analysis of flow structure for low values of incidence angle was fulfilled. The intensive traverse oscillations occured in the cavity for such inflow in addition to previous ones observed in the case of zero angle. Properties of pressure oscillations in critical cavity points were presented. The spectrum analysis of these oscillations was carried out. This analysis showed the presence of the intensive high frequency discrete components. They had the most amplitudes close to cavity bulkhead and were absent in the cavity central zone. Areas of the most probable wreckage on the cavity surface were revealed.