Robust Cut-cell algorithms for DSMC implementations employing multi-level Cartesian grids

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Robust cut-cell algorithms are detailed for general multi-level Cartesian grid direct simulation Monte Carlo (DSMC) implementations. The essential components of the cut-cell algorithms, necessary to achieve the overall functionality of general multi-level Cartesian grid DSMC implementation, are discussed in detail. Different approaches for each component of the cut-cell algorithms are elaborated and compared, based on time effciency, robustness and ease of implementation. Special situations that arise in sorting the surface triangles, calculating the cut-cell volume, and identifying multiple cut-cells resulting from single regular Cartesian cell, are handled in the algorithms, and their effects on the overall simulation results are analyzed using test cases. Simulations for a Mach number 20.2 N2 gas flowing over a spherical-blunted Planetary Probe are conducted as one demonstration, and overall good agreements with experimental results are achieved for heat flux over the Planetary Probe surface. Rarefied flow over a geometry resembling the MIR Space Station is also conducted, to demonstrate the ability of the proposed cut-cell algorithms in handling complex geometries. The time required to cut the background Cartesian cells from the surface mesh and to calculate the volume of the resulting cut-cells is shown to be comparable to the time cost for one DSMC simulation time step for cases considered.

Original languageEnglish (US)
Title of host publication42nd AIAA Thermophysics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101465
DOIs
StatePublished - 2011
Event42nd AIAA Thermophysics Conference 2011 - Honolulu, HI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

Name42nd AIAA Thermophysics Conference

Other

Other42nd AIAA Thermophysics Conference 2011
CountryUnited States
CityHonolulu, HI
Period6/27/116/30/11

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