一种动网格插值方法在内燃机CFD中的应用  

Dynamic Mesh Interpolation Method Applying in Internal Combustion Engine CFD

作　　者：刘永丰[1] 张文平[1] 明平剑[1] 倪大明[1] 

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《内燃机工程》2013年第1期87-92,共6页Chinese Internal Combustion Engine Engineering

基　　金：中央高校基本科研业务专项资金项目(HEUCF100307)

摘　　要：针对内燃机数值模拟中计算域变化特征,提出了一种非结构动网格方法,即动态层和弹簧拉伸相结合的方法,当活塞位移较小时,采用弹簧拉伸法;当位移达到一定程度时,将多组网格同时合并或分裂,以减少网格合并和分裂次数。同时,提出了一种二阶精度的插值计算方法,用于网格的合并和分裂。对于流场计算部分,采用有限体积法离散流场控制方程,采用SIMPLEC算法求解NS方程,将提出的动网格方法应用于内燃机缸内计算的三维CFD数值模拟程序,计算结果显示二阶精度插值方法与试验值吻合得更好,并体现了一定的高效性。A unstructured dynamic mesh method was presented for variation of computational domain in the numerical simulation of internal combustion engine. By using the method of combining dynamic layer with spring tension, for small piston displacement, spring method was used and while piston displacement reached a certain level, multi-group mesh layers were split or merged at the same time to reduce the times of mesh spliting and mergence. A second order accuracy interpolation method for the mergence and split of the grid was presented. The discrete flow field control equations by finite volume method （FVM） were used for flow field simulation and the SIMPLEC algorithm for solution of the NS equations. The proposed dynamic mesh method was applied for three-dimensional CFD numerical simulation program of internal combustion engine incylinder process. The calculation results using the second order accuracy interpolation method agree better with the experimental data and efficiency have risen to some extent.

关 键 词：内燃机 动网格 动态层法 插值方法 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]