Title : ( A Novel Algorithm for Implementing Specified Wall Hat Flux in DSMC: Application to Micro/Nano Flows and Hypersonic Flows )
Authors: , Ehsan Roohi ,
Abstract
This paper introduces a modified version of the iterative technique (IT) technique called the modified iterative technique (MIT) which implements a desirable wall heat flux distribution over the wall for rarefied gas simulations using Direct Simulation Monte Carlo (DSMC) method. The accuracy of the MIT technique and suitable ranges of employed parameters are examined in different test cases, i.e., shear driven Couette and cavity flows, hypersonic/supersonic flows over flat plate/cylinder, and pressure-/inertia-driven flows through micro/nanochannel. In each simulated test case rarefied gas is considered in the presence of wall with the specified heat flux distribution. The critical parameter is the controlling factor that adjusts the speed of wall temperature update. This parameter should be selected appropriately for faster solution convergence. Additional considerations in MIT technique are also presented and investigated. The possibility of employing an efficient hybrid approach based on MIT and ITS techniques for implementing specified wall heat flux is also examined.