非结构旋转动态嵌套网格技术及其应用  

Research,Development and Application of Technique of Unstructured Rotational Dynamic Overset Grids

作　　者：许和勇[1] 叶正寅[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国防科技重点实验室,陕西西安710072

出　　处：《西北工业大学学报》2011年第2期171-175,共5页Journal of Northwestern Polytechnical University

基　　金：中国博士后科学基金(20100481368);重点实验室基金资助

摘　　要：发展并改进了一套基于非结构网格的旋转动态嵌套网格方法,通过数值求解Navier-Stokes方程对二维/三维带旋转运动边界的非定常问题进行了数值模拟。将计算区域划分成包含旋转运动边界的运动区子域和覆盖其它静止边界的静止区子域,以人工边界和约束线(面)作为约束条件生成整体计算网格,进而根据设置的人工边界完成嵌套网格的建立。对翼型绕流、旋翼/机身干扰流场以及颤振激励系统绕流进行了验证计算,结果与实验值相一致,表明了文中方法能够有效地对带有旋转运动边界的非定常问题进行数值模拟。Starting from our earlier work in Ref.9,this paper does further research to develop unstructured rotational dynamic overset grids for solving the 2-D/3-D unsteady flow problems which contain rotational dynamic boundaries.We decompose the computational domain into the two sub-domains： the rotational one containing rotational boundaries and the stationary one containing the remainder flow field including stationary boundaries.The artificial boundaries and the restrictive boundaries are jointly used as the restrictive conditions for generating the whole computational grid,and then we establish the overset grids according to the artificial boundaries.We use the spring analysis theory to treat the deformation of body boundaries,solve the unsteady N-S equations in the rotational sub-domain and the stationary sub-domain respectively and accomplish their data coupling in the overlapping domain.We use three examples to numerically and respectively simulate the steady flow around the NACA0012 airfoil,the 3-D rotor-fuselage interaction unsteady flow field and the unsteady flow around a flutter excitation system;the simulation results,given in Figs.6 and 8,and their analysis show preliminarily that：（1） the results have good agreement with the experimental data;（2） our technique is efficient and robust for the prediction of complicated unsteady flows which contain rotational dynamic boundaries.

关 键 词：非结构网格 嵌套网格 旋转边界 运动区子域 静止区子域 非定常流动 

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]