针对水库异重流的运动特性,采用变密度流方程结合RNGk-ε紊流数学模型建立了剖面二维湍浮力流模型,并对入库水沙条件对异重流潜入的影响进行分析.结果表明,模型能较好地模拟异重流的下潜过程,反映泥沙浓度场与流场的强烈耦合.引入的进口密度弗汝德数较好地反映了入库进口水沙条件,异重流潜入的特征参数潜入点水深、异重流厚度、无量纲潜行时间参数均随着进口密度弗汝德数的增大而增加,计算结果能为水库水沙调度提供定性参考. According to the characteristics of the gravity flow in the reservoir, a two-dimensional turbulent flow model with variable density flow and RNGk-ε turbulence mathematical model was established, and the inflow of sediment into the reservoir was analyzed. Results It shows that the model can better simulate the heavy flow dive and reflect the strong coupling between the sediment concentration field and the flow field.The imported FDR numbers reflect the conditions of water and sediment storage and import, The inflow depth, thickness of flow, dimensionless creep time parameters of inflow characteristic parameters all increase with the increase of inlet density Froude number. The calculation results can provide qualitative reference for reservoir water and sediment scheduling.