Novel Cartesian Implementation of the Direct Simulation Monte Carlo Method

作者：Burt Jonathan M; Josyula Eswar; Boyd Iain D

来源：Journal of Thermophysics and Heat Transfer, 2012, 26(2): 258-270.

DOI：10.2514/1.T3733

A new implementation of the direct simulation Monte Carlo (DSMC) method, named the hypersonic aerothermodynamics particle (HAP) code, is presented. This code is intended for rapid setup and simulation of rarefied gas flow problems and as a framework for evaluating new physical models and numerical techniques. Unique features include the use of nonuniform Cartesian adaptive subcells, a collision probability modification to reduce errors associated with spatial averaging in collision probabilities, and automatic planar element approximation of analytically defined two- or three-dimensional surface geometries. In this work, simulations are performed using both HAP and an established DSMC code for a rarefied hypersonic flow of nitrogen over a flat plate, and excellent overall agreement is found. Comparisons are also performed with available experimental data and published DSMC results for the same flat plate flow problem. Additional simulations are employed to demonstrate reduced dependence on cell size through a proposed collision probability modification. Finally, HAP results are compared with published DSMC data for a hypersonic flow over a cylinder, and a three-dimensional sphere flow problem is used to demonstrate capabilities for automatic generation of planar cut faces over an analytically defined surface.

• 出版日期2012-6