Direct simulation Monte Carlo calculation of rarefied gas drag using an immersed boundary method

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Abstract

For simulating rarefied gas flows around a moving body, an immersed boundary method is presented here in conjunction with the Direct Simulation Monte Carlo (DSMC) method in order to allow the movement of a three dimensional immersed body on top of a fixed background grid. The simulated DSMC particles are reflected exactly at the landing points on the surface of the moving immersed body, while the effective cell volumes are taken into account for calculating the collisions between molecules. The effective cell volumes are computed by utilizing the Lagrangian intersecting points between the immersed boundary and the fixed background grid with a simple polyhedra regeneration algorithm. This method has been implemented in OpenFOAM and validated by computing the drag forces exerted on steady and moving spheres and comparing the results to that from conventional body-fitted mesh DSMC simulations and to analytical approximations.

Original languageEnglish
Title of host publicationInternational Conference of Numerical Analysis and Applied Mathematics 2015, ICNAAM 2015
EditorsTheodore Simos, Charalambos Tsitouras
PublisherAmerican Institute of Physics
Volume1738
ISBN (Electronic)978-0-7354-1392-4
DOIs
Publication statusPublished - 8 Jun 2016
EventInternational Conference of Numerical Analysis and Applied Mathematics 2015, ICNAAM 2015 - Rhodes, Greece, Rhodes, Greece
Duration: 23 Sep 201529 Sep 2015

Publication series

NameAIP Conference Proceedings
Volume1738
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference of Numerical Analysis and Applied Mathematics 2015, ICNAAM 2015
Abbreviated titleICNAAM 2015
CountryGreece
CityRhodes
Period23/09/1529/09/15

Keywords

  • drag
  • DSMC
  • immersed boundary method
  • overlap volume

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