This paper describes the simulation of the near-continuum hypersonic flow over a compression ramp using two-dimensional parallel direct simulation Monte Carlo (DSMC) method. Unstructured and triangular solution-based adaptive mesh depending on the local mean free path is used to improve the resolution of solution for the flow field with highly varying properties. In addition, a free-stream parameter is defined to help reduced the cell numbers in the free-stream area, resulting in appreciable decrease of the computational time (20~30%) without sacrificing the accuracy of the solution. Two-step multi-level graph partition technique is used for physical domain decomposition, employing estimated particle number distribution in each cell as the graph vertex weight. 32 IBM-SP2 processors are used throughout the study. Effects of outflow vacuum boundary condition, compression ramp angle, free-stream condition and length of the ramp to the flow field are investigated. Computational results are compared with previous numerical results whenever available.
|State||Published - 1 Dec 2001|
|Event||35th AIAA Thermophysics Conference 2001 - Anaheim, CA, United States|
Duration: 11 Jun 2001 → 14 Jun 2001
|Conference||35th AIAA Thermophysics Conference 2001|
|Period||11/06/01 → 14/06/01|