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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。
Studying the grid technology in the fluid-structure coupling problem. Aiming at the grid movement in the fluid domain, a new method based on mapping structured grid interpolation updating is proposed. The mapping interpolation function is used to calculate the displacement of the fluid grid node and superimposed with the initial grid coordinate value to obtain the new coordinate of the fluid. Numerical calculation of two-dimensional square, fusiform and three-dimensional cube flow field update. The calculation shows that this method can maintain the topology of the original grid, and the update speed is fast and the quality of the update is good. The fluid-structure-domain-to-fluid-domain information is transferred using constrained reactive force distribution and projection interpolation, respectively. Based on this method, a self-programming program is used to simulate the fluid-structure interaction interface of a typical structure. By comparing the effect of the structure before and after the transfer with the fluid, it is verified that the numerical transfer based on this method is effective.