Print Email Facebook Twitter A new cut-cell algorithm for DSMC simulations of rarefied gas flows around immersed moving objects Title A new cut-cell algorithm for DSMC simulations of rarefied gas flows around immersed moving objects Author Jin, W. (TU Delft ChemE/Product and Process Engineering) van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering) Kleijn, C.R. (TU Delft ChemE/Transport Phenomena) Date 2016 Abstract Direct Simulation Monte Carlo (DSMC) is a widely applied numerical technique to simulate rarefied gas flows. For flows around immersed moving objects, the use of body fitted meshes is inefficient, whereas published methods using cut-cells in a fixed background mesh have important limitations. We present a novel cut-cell algorithm, which allows for accurate DSMC simulations around arbitrarily shaped moving objects. The molecule–surface interaction occurs exactly at the instantaneous collision point on the moving body surface, and accounts for its instantaneous velocity, thus precisely imposing the desired boundary conditions. A simple algorithm to calculate the effective volume of cut cells is presented andshown to converge linearly with grid refinement. The potential and efficiency of method is demonstrated by calculating rarefied gas flow drag forces on steady and moving immersed spheres. The obtained results are in excellent agreement with results obtained with a body-fitted mesh, and with analytical approximations for high-Knudsen number flows. Subject DSMCCut-cellOverlap volumeDrag To reference this document use: http://resolver.tudelft.nl/uuid:a9416799-0134-4063-924b-295952e489ad DOI https://doi.org/10.1016/j.cpc.2016.10.023 Embargo date 2018-11-09 ISSN 0010-4655 Source Computer Physics Communications, 212, 146-151 Part of collection Institutional Repository Document type journal article Rights © 2016 W. Jin, J.R. van Ommen, C.R. Kleijn Files PDF 10299044_Jin_DSMC_IB_CPC.pdf 2.34 MB Close viewer /islandora/object/uuid:a9416799-0134-4063-924b-295952e489ad/datastream/OBJ/view