二维泥沙数学模型的改进——模型的建立

Improvement of 2-D Mathematical Model of Flow and Sediment -Establishment of the Model

本文针对河道弯曲、狭长的特点,引进贴体坐标.将复杂的河道计算域转换成规则矩形域,使问题在规则域上求解.拟合坐标系下模型改进表现在以下两方面,一是引进紊动动能和紊动耗散率闭合雷诺方程,使模型能够回答整治工程局部水流结构,如回流现象,二是建立了一种新的悬沙输移模式,该泥沙模型能体现悬沙与床沙交换机理,既适用于水库上游淤积计算,也适用于水库下游冲刷计算.

In order to calculate the movement of flow and sediment in curved, narrow and long channels, the Body- Fitted coordinate is introduced. By regional transformation, arbitrary physical domains may be transformated into regular computational fields. The improvement includes two aspects, one is that a k-ε model is used, the other is that a new model of suspended transport is developed. The comprehensive mode may be applied both in the upper and the lower reaches of a dam.