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航空工程设计中,通常需要数值模拟给出较高精度的气动力计算结果,而目标函数的误差往往是未知的。在一套极密的网格上求解控制方程当然可以保证计算精度,然而这会造成极大的计算量。自适应网格技术通过局部加密,细化关键区域的网格,保证计算精度的同时提高了计算效率。网格自适应处理的准则通常是基于流场梯度构建的,即在流场变化较快的地方进行局部加密。这将导致包含诸如激波、驻点、旋涡等物理现象的区域的网格被加密。
Aeronautical engineering design usually requires numerical simulation to give the aerodynamic calculation results with higher accuracy, but the error of the objective function is often unknown. Solving the governing equations on a very dense grid can of course guarantee the accuracy of the calculations, but this can result in a huge amount of computation. Adaptive grid technology through partial encryption, refine the key area of the grid, to ensure the accuracy of the calculation while improving computational efficiency. Grid adaptive processing guidelines are usually based on the flow gradient to build, that is, changes in the flow field faster local encryption. This will result in a grid containing regions of physical phenomena such as shock, stagnation, vortex, etc., being encrypted.