多面体网格在船体绕流计算中的应用

Application of Polyhedral Mesh in Numerical Simulations of Flow Around Hulls

为了验证多面体网格在船体绕流、特别是存在自由面的高速船体绕流计算中的有效性,将多面体网格应用于动网格中,基于多面体网格对DARPA Suboff潜艇进行了数值计算;基于混合网格和动区域法对一种高速单体穿浪船进行了数值计算,并将数值计算结果同水池实验结果进行了对比.研究表明:同四面体网格相比,多面体网格能有效减少非结构网格的单元数量,并能用更少的网格单元获取相似甚至更好的计算结果;多面体网格在潜艇绕流计算上的应用效果非常好;结合Robust(Octree)网格生成方法可改善多面体网格的正交性和分层性,进而能够更好地捕捉波形和飞溅;混合网格结合动区域法可以将多面体网格应用于包含船体运动的数值计算.

In order to test and verify the applicability of the polyhedral mesh for simulations of flow around hulls,especially for simulations of high speed flow around a hull with free surface and considering hull motions,the polyhedral mesh was used to predict the drag of a submarine model DARPA Suboff.Besides,a numerical method with polyhedral mesh,hybrid mesh,dynamic zone and turbulence models was developed to calculate the sailing characteristics of Fast Mono-WPC.The numerical results were compared with the experimental results.Fine applicability of polyhedral mesh for simulations of flow around hulls was verified and demonstrated.