Direct simulation Monte Carlo method for gas flows in micro-channels with bends with added curvature

Abstract

Abstract. Gas flows in micro-channels are simulated using an open source Direct Simulation Monte Carlo (DSMC) code dsmcFOAM for general application to rarefied gas flow written within the framework of the open source C++ toolbox called OpenFOAM. Aim of this paper is to investigate the flow in micro-channel with bend with added curvature. Results are compared with flows in channel without added curvature and equivalent straight channel. Effects of micro-channel bend was already thoroughly investigated by White et al. Geometry proposed by White is also used here for refference.

Large eddy simulation of flow through artificial macro-porous structure

“…Due to difficulties in creating sufficiently fine and well structured computational grid of real porous structure, a creation of an artificial porous structure is commonly used method for reducing the computational cost and for further understand the flow behavior (Jungreuthmayer et al, 2015). In porous structures and microchannels with holes as small as a mean free path of molecule, the continuum hypothesis is not valid and molecular dynamics simulation methods like the Direct Simulation Monte Carlo are used rather than the Finite Volume Method applied on the Navier Stokes equations (Tisovský, 2017). A crucial parameter is the Knudsen number which compares the molecular mean free path with a characteristic length scale.…”