Multi-species modeling is implemented for the particle-based ellipsoidal statistical Bhatnagar–Gross–Krook method monatomic species in open-source plasma simulation suite PICLas. After a literature review on available multi-species extensions of kinetic model equations and approaches determination transport coefficients, Brull's former Wilke's mixing rules collision integrals latter. The implem...

Multiscale computational approach that combines different methods to study laser ablation phenomenon is presented. The methods include the molecular dynamics (MD) breathing sphere model for simulation of the initial stage of laser ablation, a combined MD finite element method (FEM) approach for simulation of propagation of the laser-induced pressure waves out from the MD computational cell, and...

We present and discuss a particle simulation method for solving the Boltzmann equation which incorporates the variance reduction ideas presented in L. L. Baker and N. G. Hadjiconstantinou Physics of Fluids 17, 051703 2005 . The variance reduction, achieved by simulating only the deviation from equilibrium, results in a significant computational efficiency advantage for low speed flows compared ...

A parallel direct simulation Monte Carlo method is developed, which uses dynamic domain decomposition to solve the problem of load unbalancing among processors. In addition, variable time-step method and unstructured adaptive mesh are implemented, respectively, for reducing the computational time and increasing the accuracy of solution. Associated flow chart of the proposed DSMC method is illus...

We perform a numerical study of the fluctuations of the rescaled hydrodynamic transverse velocity field during the cooling state of a homogeneous granular gas. We are interested in the role of Molecular Chaos for the amplitude of the hydrodynamic noise and its relaxation in time. For this purpose we compare the results of Molecular Dynamics (MD, deterministic dynamics) with those from Direct Si...

The implementation of an adaptive mesh embedding (h-reflnement) schemes using unstructured grid in two-dimensional Direct Simulation Monte Carlo (DSMC) method is reported. In this technique, local isotropic refinement is used to introduce new meshes where local cell Knudsen number is less than some preset value. This simple scheme, however, has several severe consequences affecting the performa...

We apply the Direct Simulation Monte Carlo (DSMC) method, developed originally to calculate rarefied gas dynamical problems, to study the gas flow in an accretion disc in a close binary system. The method involves viscosity and thermal conduction automatically, and can thus simulate turbulent viscosity (α viscosity).

Abstract The unified stochastic particle method based on the Bhatnagar-Gross-Krook model (USP-BGK) has been proposed recently to overcome low accuracy and efficiency of traditional methods, such as direct simulation Monte Carlo (DSMC) method, for multi-scale gas flows. However, running with extra virtual particles space interpolation, previous USP-BGK cannot be directly transplanted into existi...

discuss its properties and briefly describe the Direct Simulation Monte Carlo (DSMC) method (see [1]) which is widely applied in numerics. Then, in the second part of the talk, we present the Stochastic Weighted Particle Method (SWPM) which was introduced in [2]. This numerical method was developed for problems with big deviation in magnitude of values of interest. We describe the corresponding...