Dynamic hybrid grid generation for complex geometries
Yang Yong-jian · Kongqi donglixue xuebao · 2004
In this paper, a dynamic hybrid grid generation method is presented for complex geometries. Body-fitted quadrilateral (quad) grids are generated first near solid bodies. An adaptive Cartesian mesh is then generated to cover the entire computational domain. Cartesian cells which overlap the quad grids are removed from the computational domain, and a gap is produced between the quad grids and the adaptive Cartesian grid. Finally triangular grids are used to fill this gap. With the motion of moving bodies, the quad grids move with the bodies, while the adaptive Cartesian grid remains stationary. Meanwhile, the triangular grids are deformed according to the motion of solid bodies with a 'spring' analogy approach. If the triangular grids become too skewed, or the adaptive Cartesian grid crosses into the quad grids, the triangular grids are regenerated. Dynamic hybrid grids for several complex geometries are generated, which demonstrate the high-quality, high-efficiency, and robustness of present method.