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Abstract
The new intermolecular collision scheme is developed to obtain an excellent result even if cells are lengthened in the direct simulation Monte Carlo (DSMC) calculation. In the new scheme, the velocity of one molecule of a collision pair is modified before and after a conventional collision calculation, assuming that velocity distributions in all flow-field are in local equilibrium with some temperature and flow velocity. The DSMC method with the new collision scheme is applied to three-dimensional supersonic free jets and two-dimensional vortices shedding behind a flat plate or a circular cylinder. When considering easy decision of boundary conditions and no divergence of calculation in the DSMC method, it is worth recognizing anew the possibility of the method to compressible fluid.
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