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提出了一种基于多重网格技术，可快速求解Ｓ形进气道粘性内流场的实用工程算法：从Ｂｒａｎｄｔ的多重网格理论出发，采用隐式Ｂｅａｍ－Ｗａｒｍｉｎｇ时间推进格式，结合“锯齿式”迭代技术交替在粗、细两种网格上对雷诺平均三维非定常Ｎ－Ｓ方程进行求解。用此算法数值模拟了某型号Ｓ形进气道的内流场，与试验结果对比显示：计算得到的流场符合一般Ｓ形管道流动特性，所捕获的二次流图谱清晰合理，进气道出口截面处总压恢复系数与试验值较为接近。与普通单层网格计算方法相比，计算结果精度高，收敛速度快。
A practical engineering algorithm based on multi-grid technique to solve the viscous internal flow field of S-shaped inlet is proposed. According to Brandt’s multi-grid theory, an implicit Beam-Warming time advancement scheme is adopted, "Iterative techniques alternately solve the Reynolds-averaged three-dimensional unsteady N-S equations on rough and fine grids. The numerical simulation of the internal flow field of a S-shaped inlet of a certain model is carried out by using this algorithm. Comparing with the experimental results, it is found that the calculated flow field conforms to the flow characteristics of a general S-shaped pipe and the captured secondary flow is clear and reasonable. The total pressure recovery coefficient at the exit cross section is close to the test value. Compared with ordinary single grid computing method, the result of calculation is high precision and fast convergence.