8 papers
Adjoint shape optimization of oscillatory rarefied gas flows
Pengshuo Li, Lei Wu
A fast-converging and asymptotic-preserving adjoint shape optimization method is proposed for drag reduction of multiscale gas flows in vibrating micro-electro-mechanical systems.…
Small Rarefaction, Large Consequences: Limits of Navier Stokes Turbulence Simulations
Songyan Tian, Lei Wu
We conduct numerical simulations of rocket plume impingement on a lunar landing surface using two complementary frameworks: the Boltzmann equation, which naturally captures rarefie…
Frequency-domain general synthetic iterative scheme for efficient simulation of oscillatory rarefied gas flows
Pengshuo Li, Lei Wu
Oscillatory rarefied gas flows are frequently encountered in MEMS, and their efficient numerical simulation remains a major challenge due to the time dependent nature of the proble…
Fast-Converging and Asymptotic-Preserving DSMC
Bin Hu, Liyan Luo, Kaiyuan Wang +1
Improving the efficiency of the direct simulation Monte Carlo (DSMC) method has become increasingly urgent with the rapid development of space exploration. To address this issue, t…
Coherent Rayleigh-Brillouin scattering: influences of intermolecular potentials and chirp rates
Lei Wu
Chirped coherent Rayleigh-Brillouin scattering (CRBS) is a flow diagnostic technique that offers high signal-to-noise ratios and nanosecond temporal resolution. To extract informat…
Accelerating the Monte Carlo simulation of the Enskog equation for multiscale dense gas flows
Bin Hu, Liyan Luo, Lei Wu
A general synthetic iterative scheme is proposed to solve the Enskog equation within a Monte Carlo framework. The method demonstrates rapid convergence by reducing intermediate Mon…
Temperature jump coefficients in polyatomic gas with strong translational/internal non-equilibrium
Bin Hu, Lei Wu
The temperature jump problem in polyatomic gas flow with translational/internal non-equilibrium is investigated, where the internal temperature is excited by volumetric heating, wh…
NiST: a non-localized spatial-temporal constitutive relation in rarefied gas dynamics
Xiaoda Li, Bin Hu, Lei Wu
Although the mesoscopic Boltzmann equation describes the rarefied gas dynamics, finding its solutions in complicated engineering problems is challenging. Therefore, over the past o…