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为了准确获得潜艇的流场信息,采用不同的近壁面处理方法,结合两种湍流模型(SSTk-ω和LES)对潜艇的黏性流场进行数值仿真,并将计算结果与试验值进行对比分析,研究了潜艇黏性流场在定常及非定常情况下近壁面网格尺寸对计算结果的影响.结果表明:调整近壁面网格的Y+值能够有效地改善计算结果的准确性,当结合SSTk-ω湍流模型进行定常计算时,阻力计算结果的准确性随近壁面网格尺寸的增大而降低,Y+值处于2~50的计算结果最为精确;当应用大涡模拟对潜艇流场进行计算时,同一Y+值并不适用于所有计算项,阻力计算时Y+值控制在10~250、伴流场求解Y+值控制在2~50是最佳计算方案.
In order to obtain the submarine flow field information accurately, the viscous flow field of the submarine was numerically simulated with two different turbulence models (SSTk-ω and LES) using different near-wall treatments. The calculated results were compared with the experimental values , The submarine viscous flow field under constant and unsteady conditions is studied. The results show that adjusting the Y + value of the near-surface grid can effectively improve the accuracy of the calculation results. When combined with SSTk -ω turbulence model, the accuracy of the resistance calculation results decreases with the increase of the size of the near-wall grid, and the calculation result of the Y + value from 2 to 50 is the most accurate. When large-eddy simulation is used to calculate the flow field of the submarine , The same Y + value does not apply to all the calculation items, the Y + value in the resistance calculation is controlled at 10-250, and the Y + value in the flow field solution is 2-50 at the optimal calculation scheme.