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

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 particle...

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Main Authors: Jin, W., Kleijn, C. R., van Ommen, J. R.
Format: Conference Proceeding
Language:English
Subjects:
Computer simulation
Direct simulation Monte Carlo method
Drag
Finite element method
Mathematical analysis
Monte Carlo simulation
Rarefied gases
Regeneration
Three dimensional bodies
Three dimensional motion
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Kleijn, C. R.
van Ommen, J. R.
description 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.
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Computer simulation
Direct simulation Monte Carlo method
Drag
Finite element method
Mathematical analysis
Monte Carlo simulation
Rarefied gases
Regeneration
Three dimensional bodies
Three dimensional motion
title Direct simulation Monte Carlo calculation of rarefied gas drag using an immersed boundary method
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