Saitama University Graduate School
Saitama University Department of Mechanical Engineering, Faculty of Engineering
Saitama University Department of Mechanical Engineering, Faculty of Engineering
出版者
航空宇宙技術研究所
出版者（英）
National Aerospace Laboratory (NAL)
雑誌名
航空宇宙技術研究所特別資料
雑誌名(英)
Special Publication of National Aerospace Laboratory
Interactions of the planar shock wave propagating along a backward-facing step region with a density interface are simulated numerically. The time-dependent solutions of the Euler equations were obtained by using a explicit predictor-corrector Total Variation Diminishing (TVD) scheme. A flow field consists of two regions, one is the backward-facing step region filled with gas-2, the other is the region filled with gas-1 above it. A planar shock propagating in gas-1 propagates along the backward-facing step and interacts with the interface separating these two gases with different densities. Two general cases of interface are considered, which are called as a slow/fast interface and a fast/slow interface. As parameters of calculations, a density ratio of two gases and a shock Mach number were selected. In the case of slow/fast interaction, a shock transmitted in a light gas propagates with higher propagation velocity and, behind the shock, a large vortex is created which mixes two gases. For the fast/slow interactions, a shock transmitted in a heavy gas forms an oblique shock wave whose angle is determined by the density ratio and the interface is more stable in comparison with slow/fast interaction.
密度界面と衝撃波の干渉過程のシミュレーション
nalsp0027040.pdf
(476.24KB)
