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近年来,采用时间相关欧拉方程或N-S方程求解跨音速流得到了迅速发展。为了获得二元或三元复杂形体正确的表面气动参数和足够高分辨率的流场物理特性,必须采用十分细密的网格,因而导致计算时间成倍增长。为此,除继续发展各种差分格式,探讨各种自适应网格技术外,运用多重网格技术加速收敛过程得到了国外普遍关注并取得了一定的成功。国内也已有采用多重网格法解跨音速欧拉流的文章,然而均局限于两重网格的计算。为探索多重网格法和焓阻尼技术对加速收敛的作用,我们以NACA0012翼型的跨音速流动为例,采用MacCormack两步显式格式进行了数值实
In recent years, the use of time-dependent Euler equations or N-S equations to solve transonic flow has been rapidly developed. In order to obtain the correct surface aerodynamic parameters of binary or ternary complex shapes and the physical properties of the flow field with sufficiently high resolution, a very fine grid has to be used, resulting in a doubling of computational time. To this end, in addition to continue to develop a variety of differential formats, to explore various adaptive grid technology, the use of multiple grid technology to speed up the convergence process has been the general concern abroad and has achieved some success. Domestic multi-grid method has also been used to solve the transonic Euler flow of the article, but are limited to two grid computing. In order to explore the effect of multi-grid method and enthalpy damping on accelerating convergence, taking the transonic flow of NACA0012 airfoil as an example, we use MacCormack two-step explicit format to perform numerical simulation