Solution-adaptive and quality-enhancing grid generation

A straightforward and effective procedure for converting any CFD code that operates on a block-structured grid into a dynamically adaptive code is presented. Coupling between the grid generation system and the flow solver is through external files, so that only minimal changes are required in the source codes. Adaptive grids are generated using elliptic equation techniques. The mechanism of grid movement is control functions, which form the right side of the system of generating equations. These control functions can be specified to include grid quality measures, flow solutions, solution gradients, solution curvature, or any combination of these. Adaptation can be static, dynamic, or periodic. Typical results for adaptation in compressible and incompressible flows are presented and compared with solutions obtained on static grids.