Title: Filtering and Limiting in High Order Methods for Non-ideal MHD Speaker: Helen Yee, Exploration Technologies Directorate, NASA Ames Research Center Location: Building 980, Room 95 (Sandia NM) Brief Abstract: The adaptive nonlinear filtering and limiting in spatially high order schemes [Yee et al. (1999), Yee & Sjogreen (2002) and Sjogreen & Yee (2004)] for the compressible Euler and Navier-Stokes equations have been recently extended to the ideal and non-ideal magnetohydrodynamics (MHD) equations. The numerical dissipation control in these adaptive filter schemes consists of automatic detection of different flow features as distinct sensors to signal the appropriate type and amount of numerical dissipation/filter where needed and leave the rest of the region free from numerical dissipation contamination. The numerical dissipation considered consists of high order linear dissipation for the suppression of high frequency oscillation and the nonlinear dissipative portion of high-resolution shock-capturing methods for discontinuity capturing. The applicable nonlinear dissipative portion of high-resolution shock-capturing methods is very general. The objective of this talk is to present the performance of three commonly used types of discontinuity capturing nonlinear numerical dissipation as nonlinear filters for the viscous, resistive and hall MHD. CSRI POC: Randall M. Summers, (505) 844-6296 |