In cases of flow around complex body and timewisely varying flow fields due to bodies of arbitrary motions with respect to each other, computational simulation is very difficult mostly due to problems in grid generation.
A computer program which can numerically simulate flow fields around the complex geometry and flow field induced by multiple bodies in relative motion is developed and some validation problems are solved. To overcome difficulties in grid generation of the above cases, Chimera grid scheme is adopted. The basic flow solver algorithm is Beam-Warmig-Steger's approximately factored ADI scheme. Through the steady and unsteady computation using Chimera grid scheme, the difficulties in grid generation was greatly reduced while maintaining accuracy in space and time. Finally, to effectively simulate flow fields induced by a high speed train moving in a tunnel with proximity to ground, Patchedlike Chimera scheme is discussed, which considered as the most recommendable approach for high speed train simulation.
