Parallel hybrid particle-continuum (DSMC-NS) flow simulations using 3-D unstructured mesh

Jong-Shinn Wu*, Y. Y. Lian, G. Cheng, Y. S. Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

3 Scopus citations


A hybrid, direct-simulation Monte Carlo-Navier-Stokes (DSMC-NS) approach for steady-state flows using 3D unstructured mesh is presented to combine the high computational efficiency of the NS solver in continuum and thermal-equilibrium regions with high fidelity of the DSMC method in "breakdown" regions. Flexible overlapping regions between DSMC and NS simulation domains are designed by taking advantage of the unstructured grid topology in both solvers. Two breakdown parameters, including a continuum breakdown parameter and a thermal nonequilibrium indicator, are employed to determine the DSMC simulation and NS simulation domains, in addition to the concept of overlapping regions. Proposed hybrid DSMC-NS scheme was verified using a quasi-2D supersonic wedge flow and realistic 3D flows with two parallel near-continuum orifice jets expanding into a near-vacuum environment. Results show that the number of couplings for convergence between two solvers is approximately 2-3 if supersonic flows dominate near the breakdown interface, while it increases up to 8-10 if subsonic flows dominate near the breakdown interface. At the end, the proposed hybrid scheme is employed to simulate a realistic RCS plume to demonstrate its capability in handling realistic challenging problems. © 2007

Original languageEnglish
Title of host publicationParallel Computational Fluid Dynamics 2006
PublisherElsevier Ltd
Number of pages10
ISBN (Print)9780444530356
StatePublished - 1 Dec 2007


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