| 马福喜,李志伟.水中抛沙床面三维淤积形态研究[J].水利学报,2001,32(10):0072-0078 |
| 水中抛沙床面三维淤积形态研究 |
| Numerical study on 3-D deposition patterns of sand dumping in flowing water |
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| DOI： |
| 中文关键词: 紊流模型 羽流 分叉及泥沙淤积形态 |
| 英文关键词: deposition pattern sand dumping turbulence model plume bifurcation |
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| 摘要点击次数: 1897 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| The 3-D buoyancy extended K-ε turbulence model is employed in the study of deposition patterns for sand dumping in flow water. This model consists of one continuity equation, three momentum equations, two turbulence-modeling equations, one concentration equation and one deposition equation. In the model, the governing equations are split into three parts in the finite difference solution namely advection, dispersion and propagation. The advection part is solved by the QUICKEST scheme. The dispersion part is solved by the central difference method and the propagation part is solved implicitly by using the Gauss-Seidel iteration method. By using this model, 8 numerical sample runs have been conducted. Two different deposition patterns are obtained. One is oblong and the other is horseshoe shape depending on hydraulic conditions and sediment parameters. The computer results are in satisfactory agreement with experiment. The reasons for the formation of the horseshoe shape have been investigated with the concept of bifurcation of buoyant plumes. |
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