高含沙水流二维数值模拟

Two-D numerical model for hyperconcentrated sediment flow

一定条件下的高含沙水流具有非牛顿体特性 ,在天然多沙河流中由于地形分布等因素的影响 ,流动强度差异较大 ,往往呈现非牛顿体和牛顿体两种不同的流动特性 ,本文通过引进高含沙水流不同流态的阻力关系及切应力关系 ,建立河道二维高含沙水流数学模型 ,反映高含沙水流在不同流动状态下的特征 ,通过数值实验计算对模型进行了初步检验 。

Under some cases, Newton and non-Newton flows can occurred simultaneously in natural rivers with hyperconcentrated sediment flow, owing to the flowing intensity variation induced by river bed form distribution. Given a shear stress relation and resistance laws of the hyperconcentrated sediment flow in different flowing states, this paper build a two-D numerical model to simulate the characteristics of the hyperconcentrated sediment flow. A careful numerical test designed by the authors show that the model results are in good agreement with the laboratory observed data.