复杂外形的动态混合网格生成方法  

Dynamic hybrid grid generation for complex geometries

作　　者：张来平[1] 王振亚[1] 杨永健[1] 

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《空气动力学学报》2004年第2期231-236,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(创新群体)资助项目.

摘　　要：本文将层推进方法、四分树方法和阵面推进法相结合,建立了二维复杂外形的动态混合网格生成方法。首先用层推进方法在运动物体附近生成贴体的四边形网格,然后用四分树方法在外场生成自适应的矩形网格,而中间由三角形网格过渡。三角形网格由阵面推进法生成,并由节点松弛和"对角线交换"方法进行优化。当物体运动时,贴体的四边形网格随物体运动而运动,而外场的矩形网格保持静止。中间过渡层的三角形网格随物体运动而变形。当物体运动位移较大导致出现质量较差的单元甚至导致网格相交时,则在局部重新生成网格。利用上述动态混合网格生成方法,生成了多种含相对运动的复杂外形的动态混合网格,网格质量令人满意。A dynamic hybrid grid generation method was presented for complex geometries. Body-fitted quadrilateral (quad) grids were generated first near solid bodies. An adaptive Cartesian mesh was then generated to cover the entire computational domain. Cartesian cells which overlap the quad grids were removed from the computational domain, and a gap was produced between the quad grids and the adaptive Cartesian grid. Finally triangular grids were 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 were 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 were generated, which demonstrate the high-quality, high-efficiency, and robustness of present method.

关 键 词：非结构网格 混合网格 运动网格 非定常流 计算流体力学 翼型 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]