Journal of Applied Mechanical Engineering

Spatially and temporally adaptive multi-scale three dimensional direct simulation Monte Carlo for modeling gas flows in micro devices

3^rd International Conference on Fluid Dynamics & Aerodynamics

October 25-26, 2018 | Berlin, Germany

Mirvat Shamseddine and Issam Lakkis

American University of Beirut, Lebanon

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

An efficient multi-scale direct simulation Monte Carlo (DSMC) algorithm to simulate three-dimensional rarefied gas flows over complex geometries is presented. The proposed algorithm employs a novel spatiotemporal adaptivity scheme. The scheme adaptively computes the cell size distribution and assigns the appropriate number of substeps for each cell, based on the gradients of flow macro properties. Spatial representation is based on a hierarchical octree-based Cartesian grid with low memory storage requirement. The octree hierarchical grid endows the method with straightforward and efficient data management suitable for particle ray tracing and dynamic grid refinement and coarsening. Solid objects, represented by triangulated surfaces, are incorporated using a cut-cell algorithm. Performance of the method is assessed by comparing with benchmarked test cases for various rarefied gas flows.

Biography :

E-mail: mos05@mail.aub.edu