Implementation of a Robust Multigrid Algorithm in a Production-Level Overset CFD Solver
Scot A. Slimon, Donald T. Davis, Craig Wagner · 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition · 2010
A new approach in implementing a Full Approximate Storage Multigrid scheme into an overset-based CFD solver is described . The approach requires no changes to the existing grid generation protocols, and allows application of high-order discretization schemes. The resulting method is robust in th at it does not impose more restrictive limits on time step relative to single-grid simulations, and converges to the same machine-zero limit. Application of the method to steady and unsteady three-dimensional complex flows is presented. The results show that the Multigrid implementation reduces the workload relative to single-grid simulations by a factor between four and eight.