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基于标准的k-ε模型,利用有限体积法,对冰盖下水流速度分布进行了二维数值模拟和分析.结果表明:当冰盖和河床糙率比值变化时,水流速度剖面发生变化;冰盖下的最大流速值比速度对称分布时要大,且偏于光滑的一边;在相对光滑壁处近壁流速值大于相应对称分布时的流速值,该结果与实验室实测速度剖面情况吻合.数值试验表明,最大流速点位置的偏移量仅在有限的范围内,冰盖区、床面区及冰盖下水流平均速度相差较小,表明了工程应用中假定各区流速相等是可行的.
Based on the standard k-ε model, the finite volume method was used to simulate and analyze the velocity distribution under the ice sheet. The results show that the velocity profile changes when the roughness ratio of the ice sheet and bed changes. The maximum flow rate under the lid is larger than that at the symmetrical velocity and smooth side. The flow velocities near the wall at the relatively smooth wall are larger than the corresponding symmetrical distributions, which agrees well with the laboratory measured velocity profile. Numerical experiments show that the maximum displacement of velocity point is only within a limited range, and the difference of average velocities of water flow under ice sheet, bed area and ice sheet is small, which indicates that it is feasible to assume that flow velocity is equal in engineering application.