Computing and Mathematical Sciences Colloquium
April 11, 2016
Can Embedded Boundary Methods Compute High Reynolds Number Flow?
Professor Marsha Berger,
Computer Science Department,
Courant Institute of Mathematical Sciences New York University
Cut cell methods are very popular for inviscid flow simulations since they handle extremely complicated geometry and are easily automated. However, cut-cell methods are rarely used for high-Reynolds number flows, since without body-fitted grids it is extremely inefficient to resolve the fine scales of a boundary layer. In this talk I will describe our basic mesh generator and flow solver for inviscid flows, and the extensions needed to compute viscous flow using the Spalart-Allmaras turbulence model. We have developed a subgrid-based wall model for use with cut cell grids that is very efficient and gives better results than the analytic wall functions that are typically used. Our model solves a two point boundary value problem where the endpoint values come from the underlying Cartesian grid, and it is coupled to the Cartesian grid in a fully conservative way. We will show two dimensional computational results on a variety of benchmark cases.
Computing and Mathematical Sciences Colloquium Series