ADAPTIVE-GRID SCHEME FOR VORTEX-INDUCED BOUNDARY-LAYERS

An adaptive-grid scheme is developed to resolve extremely large gradie nts associated with an unsteady vortex-induced boundary-layer flow. Pr evious investigations based on Eulerian descriptions have failed to re solve the terminal structure of the flowfield due to the emergence of a singularity at a finite time. The present approach is based on a mov ing-grid method applied to the streamwise direction of the boundary la yer. Grid movement is coupled to the flowfield in an autonomous manner by an analytical weight function designed to improve the numerical st ability and computational efficiency of the algorithm. The time and lo cation of the singularity are successfully predicted in agreement with previous published Lagrangian calculations and asymptotic analysis.