Modelling unsteady processes with the Direct Simulation Monte Carlo technique

H. M. Cave*, K. C. Tseng, Jong-Shinn Wu, M. C. Jermy, Y. Y. Lian, S. P. Krumdieck, T. C. Kuo, M. Z. Wu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Over the past 40 years, the Direct Simulation Monte Carlo (DSMC) technique has been developed into a flexible and effective solver for flow problems in the rarefied to near continuum regime. However, even with modern parallelised code, the efficient computation of unsteady near-continuum flows, which are important in processes such as Pulsed Pressure Chemical Vapour Deposition (PP-CVD), remains a challenge. We have developed an unsteady parallel DSMC code (PDSC) utilising advanced features such as transient adaptive sub-cells to ensure nearest neighbour collisions and a temporal-variable time step to reduce computation time. This technique is combined with a unique post-processor called the DMSC Rapid Ensemble Averaging Method (DREAM) which reduces the statistical scatter in the data sets produced by PDSC. The combined method results in a significant memory and computational reduction over ensemble averaging DSMC, while maintaining low statistical scatter in the results. The unsteady code has been validated by simulation of shock-tube flow and unsteady Couette flow, and a number of test cases have been demonstrated including shock impingement on wedges. The technique is currently being used to model the development of an underexpanded jet in a PP-CVD reactor.

Original languageEnglish
Title of host publicationProceedings of the 16th Australasian Fluid Mechanics Conference, 16AFMC
Pages1026-1032
Number of pages7
StatePublished - Dec 2007
Event16th Australasian Fluid Mechanics Conference, 16AFMC - Gold Coast, QLD, Australia
Duration: 3 Dec 20077 Dec 2007

Publication series

NameProceedings of the 16th Australasian Fluid Mechanics Conference, 16AFMC

Conference

Conference16th Australasian Fluid Mechanics Conference, 16AFMC
Country/TerritoryAustralia
CityGold Coast, QLD
Period3/12/077/12/07

Fingerprint

Dive into the research topics of 'Modelling unsteady processes with the Direct Simulation Monte Carlo technique'. Together they form a unique fingerprint.

Cite this