A gas dynamics study of jet flows and Cartesian meshing method for DSMC code development

This dissertation involves a gaskinetic study and analytical results on high speed rarefied gas flows from a planar exit. The beginning of this study reviews the results for planar free jet expanding into a vacuum, followed by an investigation of jet impingement on normally set plates with either a diffuse or a specular surface. Presented results include exact solutions for flowfield and surface properties. Numerical simulations with the direct simulation Monte Carlo (DSMC) method were performed to validate these analytical results, and good agreement with this is obtained for flows at high Knudsen numbers. They expect to find many possible applications, such as materials processing inside vacuum chambers, space and micro-propulsion devices, and molecular beams.;The second part reports a scalar implementation of Cartesian meshing method into a multi-dimensional direct simulation Monte Carlo package named Generalized Rarefied gAs Simulation Package (GRASP). This implementation adopts a concept of simulation engine and it utilizes many Object-Oriented Programming features and software engineering design patterns.