Three issues are tackled in this study to improve the robustness of local remeshing techniques. Firstly, the local remeshing region (hereafter referred to as ‘hole’) is determined by considering two constrained goals of minimising the hole size and smoothing the hole boundary at the same time. Secondly, the grid sources for element size control are attached to moving bodies and will move along with their host bodies to ensure a reasonable grid resolution inside the hole. Thirdly, the boundary recovery procedure of a Delaunay grid generation approach is enhanced by a new grid topology transformation technique (namely shell transformation) so that the new grid created inside the hole not only respects the hole boundary exactly, but also contains no elements with extremely deformed/skewed shapes. The proposed local remeshing algorithm has been integrated into an in-house unstructured grid based simulation system for moving boundary problems. The robustness and accuracy of the developed local remeshing technique is demonstrated by its applications in industry-level complex flow simulations.
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