旋涡动力学方程非定常动边界条件  

UNSTEADY BOUNDARY CONDITIONS OF VORTEX DYNAMICS EQUATION FOR MOVING BODIES

作　　者：吴文权[1] 

机构地区：[1]上海理工大学动力学院,上海200093

出　　处：《工程热物理学报》2002年第3期289-292,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.59876023)

摘　　要：详细讨论了旋涡动力学方程非定常动边界条件。给出了任意非定常运动边界上速度旋度的确定方法。并采用了“局部线性化及再校正”技术、时间滞后求解方法，求解每一时间步边界上速度旋度值。这样可以很大程度上节省计算时间。并讨论了数值实验结果，指出动边界问题的非线性特征，对这样复杂的非线性问题不宜作过份简化。The unsteady boundary conditions of vortex dynamics equation for moving bodies are presented, based on which, the vorticities of vortex around arbitrary moving bodies are numerically dotermined. For the computation, the Piecewise Linearization and Recorrect Technique and Time Lag Algorithm are suggested and greatly reduce the required CPU time. Numerical tests demonstrate the inherent non-linear Characteristics of the flow past moving bodies, indicating that, whatever the spectrum or phases, the oscillation of flow field is different from the boundary motion, therefore over- simplified model is not applicable.

关 键 词：旋涡动力学方程 非定常运动 动边界条件 速度旋度 气动热力学 

分 类 号：V211.15[航空宇航科学与技术—航空宇航推进理论与工程]