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对于流固耦合问题,传统的数值模拟方法由于需要不断的网格重构使得问题变得复杂,本文通过利用浸入式边界法建立了在单一坐标系和网格下求解振荡转子叶片的快速计算模型,从而避免了传统方法中由于需要不断地重构贴体网格造成的数值模拟的复杂性。为了验证该方法的正确性,分别对低KC(Keulegan-Carpenter)数下的振荡圆柱和两自由度振荡圆柱进行了数值模拟,计算结果与以往的试验结果和数值结果吻合得很好,证明了浸入式边界方法的可靠性。在此基础上,对振荡转子叶片进行了数值模拟。结果表明折合速度和叶栅稠度是影响振荡转子叶片的重要因素。并且,值得注意的是这种耦合过程并没有生成贴体网格,因此大大减小了计算时间,这样可以更加快速、准确地模拟真实的叶栅流动情况。
For the problem of fluid-solid coupling, the traditional numerical simulation method is complicated by the need of continuous grid reconstruction. By using the immersion boundary method, a fast calculation model for solving the oscillating rotor blade under single coordinate system and grid is established. Thereby avoiding the complexity of the traditional method due to the need to continually reconstruct the body grid numerical simulation caused. In order to verify the correctness of the method, the numerical simulation of the oscillating cylinder and the two-degree-of-freedom oscillating cylinder under the Kelegan-Carpenter number is carried out respectively. The calculated results are in good agreement with the previous experimental and numerical results. Reliability of Immersion Boundary Method. On this basis, numerical simulation of oscillating rotor blades is carried out. The results show that the buckling speed and blade consistency are the important factors that affect the rotor blades. And, it is noteworthy that this coupling process does not generate body grid, thus greatly reducing the calculation time, so you can more quickly and accurately simulate the real cascade flow.