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| Study and application of overset unstructured grid method |
| Received:January 27, 2007 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20101027 |
| KeyWord:overset unstructured grids method moving boundary Dynamic Octree search algorithm interpolation muzzle flow field |
| Author | Institution |
| 张辉 |
南京工业大学 能源学院,南京 |
| 谭俊杰 |
南京理工大学 动力工程学院,南京 |
| 崔东明 |
南京理工大学 动力工程学院,南京 |
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| Abstract: |
| There are many moving boundary problems in aeronautics, astronautics and weapon technology researches. Overset unstructured grid method is an efficient new approach to solve the problems which contain moving bodies. The first step of this method is to generate grids around the moving objects respectively. The second step is to transfer the flow field parameters by searching and interpolation between the pieces of grids in the overlapped areas. A "Dynamic Octree" search algorithm was advanced based to search the donor cells of the nodes which locate on the hole-boundaries. Applied the mode of solving the flow field by integrating inertial and relative coordinates in the overset unstructured grids method. Used the second order Van Leer／Hanel method and fourth order Runge-Kutta method to solve the 3D Euler equations. The simulation results of the 3D Riemann problem conform to the exact results fairly well. The method advanced in this paper is proved to be suitable to solve the problems which contain shock waves. The forming process of muzzle flow field after the bullet separated from the muzzle of 7.62 mm gun was simulated. The results show the process of a bullet fling through the muzzle flow field, and accord with the experimental results very well. The overset unstructured grids method developed in this paper is proved efficient and accurate to solve the moving boundary problems. |