Automatic off-body overset adaptive Cartesian mesh method based on an octree approach

摘要

This paper describes a method for generating and adapting Cartesian off-body grids in a near-body/off-body mesh partitioning approach. This method is octree-based in the sense that the Cartesian mesh generation relies on an octree mesh, for which it is possible to build different refinement levels easily around several surfaces. The adaptation is performed on the octree mesh, so its derivation to Cartesian off-body adapted grids is immediate. The advantages of this method are: the ability to generate a Cartesian mesh on complex configurations, namely configurations where details are added to the initial configuration, for which different resolutions are required. An application to the capture of the tip vortex of a wing assesses the capability of the method to capture accurately the flow features.