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本文用具有浮力特性K -ε紊流模型研究水中抛沙床面三维淤积形态 .该模型由一个连续方程、三个动量方程、两个紊流模型封闭方程、一个泥沙浓度方程和一个泥沙淤积方程组成 .在用有限差分法对控制方程进行求解时 ,用破开算子法将控制方程分为对流、扩散和源项三部分 ,其中对流项用QUIKEST格式求解 ,扩散项用中心差分求解 ,源项用Gauss Seidel迭代法求解 .对 8组水沙条件计算表明 ,不同的水沙条件可在床面形成两种不同类型的淤积形态 :椭圆形和分叉型 .并进而用浮射流分叉理论 ,对分叉型淤积形态从水沙运动机理和内部结构上进行了探讨 .计算结果与实验室实测结果吻合良好 .
In this paper, a three-dimensional sedimentation model of water-throwing sand bed is studied by using a K-ε turbulence model with buoyancy characteristics.The model consists of a continuous equation, three momentum equations, two closed-form turbulence equations, a sediment concentration equation and a sediment When the control equations are solved by the finite difference method, the control equations are divided into three parts: convection, diffusion and source terms by using the breaking operator method, where the convection term is solved by QUIKEST format and the diffusion term is solved by central difference , And the source term is solved by Gauss Seidel iteration method.The calculation of water and sediment conditions in 8 groups shows that different sediment types can form two different types of siltation patterns on the bed: oval and bifurcation type, Fork theory, the mechanism of bifurcated sediment deposition from the movement of water and sediment and the internal structure are discussed. The calculated results are in good agreement with the experimental results.