基于单元变形的网格间流场信息传递方法

针对单元网格发生变形重构中新旧网格之间的数据插值问题,提出一种基于格点格式有限体积法的流场数据传递方法。利用非结构动网格技术,将旧网格单元移动到新网格单元,同时时间推进求解流场控制方程,获得移动后旧网格单元物理量,并将其赋给新网格单元,以此来实现两套网格间的信息传递。计算结果表明,该方法在信息传递过程中没有引入插值误差,理论上流场求解方法的精度就是信息传递精度,验证结果表明其显著优于二阶插值精度。

A new method for transferring flow informationamong meshes basing on mesh deformation

According to the data interpolation problems between the old and new grid in the mesh reconstruction, a flow field information transmission algorithm based on lattice format supported finite volume method was proposed. By using unstructured dynamic grid technology, the method made the old cells move to the new grid cells and solved control equation in time domain, then assigned the datum to the new grid cells, in order to realize information transfer between the two sets of the grid. The result shows that this method is not introduced interpolation error in the process of information transmission, the theory precision of the method is equal to the precision of information transmission, and the verification results show that the proposed method is significantly better than that of the second order interpolation method.