流固耦合问题的网格更新与信息传递新方法

NOVEL METHODS FOR MESH UPDATE AND DATA TRANSFER TECHNIQUE OF FLUID-STRUCTURE INTERACTION

研究流固耦合问题中的网格技术。针对流体域的网格移动,提出基于映射结构化网格的插值更新的新方法,采用映射插值函数计算流体网格节点位移并与初始网格坐标值叠加,以获取流体新的节点坐标。对二维正方形、梭形及三维立方体流场网格更新开展数值计算。计算表明,该方法可保持原网格的拓扑关系,且更新速度快,更新质量好。使用约束反力分配法和投影插值法分别传递流体域到结构域、结构域到流体域的信息,运用基于该方法的自编程序对典型形体的结构流固耦合界面进行信息传递计算模拟。通过对比传递前后结构与流体的作用,验证了基于该方法的数值传递效果理想。

The mesh technique was studied in this paper. For the motion of flow field mesh,a novel update method based on mapping structured mesh was presented. In present method,the mapping interpolation function was introduced to obtain the computational displacements of the flow field mesh nodes. The update mesh system for flow field is formed by adding computational displacements to the original mesh node coordinates of flow field. Through a group of the mesh update computation for flow fields around a two dimensional square object,a spindle-like object and a cubic body,it was found that the original topology of a fluid mesh system could be kept and the higher mesh quality and faster computational effect for mesh update could be obtained. Furthermore,the constrained counterforce distribution technique and the projection interpolation approach were proposed to transfer the computational data from a flow field to a structural field and reverse,respectively. Finally,with a series of computation,it was revealed that the better effect for data transfer between the interface of a flow field domain and a structural domain was reached.