Advances in Aerodynamics

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Kinetic Methods for Multiscale Flows: In Memory of Dr. Peng Wang

This collection aims to honour Dr. Peng Wang’s contributions to the field in which he worked and provide readers with a glimpse of the exciting ongoing research in the field.

The collection includes five papers by leading experts in the field, covering topics such as a three-dimensional high-order compact GKS, an adaptive DUGKS for all flow regimes, a DUGKS for multiphase flows, a DUGKS for gas mixture flows, and an accelerated low-variance DSMC by GSIS.

Multiscale simulation of rarefied gas dynamics via direct intermittent GSIS-DSMC coupling

The general synthetic iterative scheme (GSIS) has proven its efficacy in modeling rarefied gas dynamics, where the steady-state solutions are obtained after dozens of iterations of the Boltzmann equation, with minimal numerical dissipation even using large spatial cells. In this paper, the fast convergence and asymptotic-preserving properties of the GSIS are harnessed to remove the limitations of the direct simulation Monte Carlo (DSMC) method. The GSIS, which leverages high-order constitutive relations derived from DSMC, is applied intermittently, which not only rapidly steers the DSMC towards steady state, but also eliminates the requirement that the cell size must be smaller than the molecular mean free path. Several numerical tests have been conducted to validate the accuracy and efficiency of this hybrid GSIS-DSMC approach.