非结构动网格方法在内燃机数值模拟中的应用

提出了一种动态层和弹性平滑结合的非结构动网格方法,在网格运动方向进行网格合并和分裂。由于动态层方法可视为网格重构方法的特例,提出了一种内燃机缸内过程处理的二阶精度的插值计算方法。当网格运动达到一定条件时,将多组网格层同时合并或分裂,减少了网格合并和分裂次数,提高了计算效率。对于流场计算部分,采用有限体积法离散流场控制方程,运用SIMPLEC算法求解NS方程,开发了内燃机三维CFD数值模拟程序,计算实例表明计算结果与试验值吻合较好。

Application of Unstructured Dynamic Mesh Method in ICE Numerical Simulation

The unstructured dynamic method of dynamic layer and elastic moving was introduced,which allowed to merge and split in the direction of mesh movement.The dynamic layer method was regarded as the particular case of mesh reconstruction,and the interpolation method of second-order precision for ICE in-cylinder process was proposed.When the mesh deforming met a certain condition,a group mesh layer were merged or split at the same time.The times of mesh splitting and decomposition were reduced and hence the computation efficiency was increased.Concerning the flow simulation,the control equations were discretized by the finite volume method(FVM),the NS equations were evaluated by SIMPLEC algorithm and the 3D CFD simulation program was developed.The results show that the calculation results are consistent with the test value.