Parallel Unsteady Overset Mesh Methodology for a Multi-Solver Paradigm with Adaptive Cartesian Grids

摘要

This paper describes a new domain-connectivity module developed to support Chimera-based interfacing of different CFD solvers for performing time- dependent adaptive moving-body calculations of external aerodynamic flows. The domain-connectivity module coordinates the data transfer between different solvers applied in different parts of the computational domain -- body fitted structured or unstructured to capture viscous near-wall effects, and Cartesian adaptive mesh refinement to capture effects away from the wall. The CFD solvers and the domain-connectivity module are executed within a Python-based computational infrastructure. The domain-connectivity module is fully parallel and performs all its operations (identification of holes and fringe points, donor cell searches and data interpolation) on the partitioned grid data. In addition, the connectivity procedures are completely automated using the implicit hole-cutting methodology such that no user intervention or explicit hole-map specification is necessary. The capabilities and performance of the package are presented for several test problems, including flow over a NACA 0015 wing, AGARD A2 slotted airfoil, hover simulation of scaled V-22 rotor, and a dynamic simulation of UH-60A rotor in forward flight.