In the present study, a technique is developed to solve 2-D rarefied gas flows by applying the Direct Simulation Monte Carlo(DSMC) method on unstructured triangular meshes.
In the DSMC analysis, Variable Hard Sphere(VHS) model is used as a molecular model, and No Time Counter(NTC) method is employed as a collision sampling technique. Specular and diffuse model is applied for boundaries. When diatomic molecules are simulated in flows, the Larsen-Borgnakke phenomenological model is considered for redistribution between translational energy and internal energy. The unstructured triangular meshes are generated by advancing front technique, and molecular tracing through cells are achieved by applying the linear shape function to each cell nodes.
The method is applied to 2-dimensional flat-plate boundary layer flows and flows around NACA0012 airfoil, a circular cylinder, and diverging nozzle flows. Comparison are made with other analytical and experimental studies for validation
