网格之间流场信息传递的高精度方法和验证  

High accurate method for transferring flow information among meshes and its validation

作　　者：刘君[1] 白晓征[1] 王巍[2] 

机构地区：[1]国防科技大学航天与材料工程学院 [2]空军装备研究院装备总体论证研究所

出　　处：《空气动力学学报》2010年第1期1-6,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(项目批准号:90505003;10602064)

摘　　要：理论分析了插值方法引入误差的原因,提出一种利用时间推进方法和移动网格技术实现网格之间流场信息传递的思想,并构造计算方法。在介绍新的信息传递算法原理的基础上,根据三维情况下传递过程需要满足的时间推进步长稳定性条件,推导出最小推进步数的要求。最后,通过对激波诱导物体运动的非定常流动模拟,比较了信息传递算法和线性插值、加权最小二乘插值方法,计算结果表明,与插值方法相比,信息传递过程没有引入误差,能有效抑制非物理振荡,保持流场计算精度。The reason for introducing computational errors by interpolation is analyzed theoretically,and then a new method for transferring flow information among meshes is presented,which integrated time marching method and dynamic grids technology.Based on the principle of this method,the stability condition is developed in the case of three dimensions,and the minimum number of time steps is given.Moreover,the present method is compared with linear and weighted least-squares interpolation in an unsteady case of shock induced movement of a rigid body.The results demonstrated that the present method is effective in preventing spurious oscillations,without any loss in accuracy,and thus maintains higher accuracy in fluid computation.

关 键 词：多块网格 插值方法 计算流体力学 非定常流场模拟 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]