网格参数与离散格式对潜艇阻力预报精度的影响

摘要

The numerical simulation of the flow field over the SUBOFF submarine model with full ap-pendages is conducted by solving RANS equations with the finite volume method .The resistance coef-ficients of the submarine at different speeds are obtained and compared with experimental data .It is found that the results of resistance calculated by the first order upwind discrete scheme are unbelieva-ble and the refinement of grids can decrease computational errors of different discrete schemes .Be-sides ,for the coarser grids with the maximum Y + value lower than 200 ,the computational error of re-sistance can also be controlled within 3% by use of the second order accurate discrete scheme .%借助于计算流体力学软件，生成了2组不同网格数量和壁面Y ＋值的网格模型，并对潜艇周围流场进行了数值模拟，得到了不同航速下的潜艇阻力，然后结合试验数据进行了对比分析。研究发现：一阶精度离散格式的阻力计算结果误差过大不可信，而对于不同的离散格式，网格的细化都能提高计算精度；当网格模型壁面Y ＋值控制在200以内且采用二阶精度离散格式计算时，较稀的网格模型也能得到误差小于3％的计算结果。