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建立了一个基于改进“Ball-Vertex”的具有拓扑无关性的网格变形方法,用来精确模拟桨叶发生弹性变形后贴体网格的运动以及旋翼近场气动力环境,为更好地分析弹性变形对桨叶贴体网格的影响提供了一套解决方案。该网格变形方法从基本的弹簧模拟思路出发,用一网状弹簧系统来模拟桨叶贴体网格的变形和运动。在网格结点周围引入“Ball-Vertex”概念,通过添加相关的冗余约束,该方法保证网格结点在变形过程中不会越过与该点所对应的对角面,从而避免了畸形网格单元的产生,可有效地用于较大变形情况下的流场数值计算。使用所建立的方法,首先对绕二维翼型的结构网格和非结构网格进行了网格变形模拟,以表明方法的有效性;然后,将该方法应用于振荡翼型的流场数值求解,进一步验证了所建立的方法;最后,结合该网格变形方法和旋翼流场求解方法对弹性旋翼流场进行了数值计算。在此基础上,得出了一些有意义的结论。
A topology-independent grid deformation method based on the improved “Ball-Vertex” was established to accurately simulate the motion of the body-fitted grid and the near-field aerodynamic environment of the rotor after elastic deformation, A solution is provided to analyze the effect of elastic deformation on the grid of the blade body. The grid deformation method starts from the basic idea of spring simulation, and uses a mesh spring system to simulate the deformation and movement of the grid. The concept of “Ball-Vertex” is introduced around the mesh nodes. By adding the relevant redundancy constraint, this method can ensure that the mesh nodes will not cross the diagonal surfaces corresponding to this point during the deformation, thus avoiding The generation of deformed grid cells can be effectively used in numerical simulation of flow field under large deformation. Using the established method, the deformation of the structure mesh and the unstructured mesh around the two-dimensional airfoil are simulated to show the effectiveness of the method. Then, the method is applied to the flow field numerical value of the oscillating airfoil Finally, the flow field of the elastic rotor is numerically calculated by combining the method of deformation of the rotor and the solution of rotor flow field. On this basis, we come to some meaningful conclusions.