外文翻译---明渠中非恒定流和非均匀泥沙输移的二维数值模拟（节选）

《外文翻译---明渠中非恒定流和非均匀泥沙输移的二维数值模拟（节选）》由会员分享，可在线阅读，更多相关《外文翻译---明渠中非恒定流和非均匀泥沙输移的二维数值模拟（节选）（16页珍藏版）》请在毕设资料网上搜索。

1、中文 2500 汉字， 1500 单词。 8700 英文字符 出处： Journal of Hydraulic Engineering, 2004, 130(10):pgs. 1013-1024. 附录 附录一、英文原文 Depth-Averaged Two-Dimensional Numerical Modelingof Unsteady Flow and Nonuniform Sediment Transport in Open Channels Weiming Wu, M.ASCE1 Abstract: A depth-averaged two-dimensional (2D) nume

2、rical model for unsteady flow and nonuniform sediment transport in openchannels is established using the finite volume method on a nonstaggered, curvilinear grid. The 2D shallow water equations are solved bythe SIMPLE(C) algorithms with the Rhie and Chows momentum interpolation technique. The propos

3、ed sediment transport model adopts a nonequilibrium approach for nonuniform total-load sediment transport. The bed load and suspended load are calculated separately or jointly according to sediment transport mode. The sediment transport capacity is determined by four formulas which are capable of ac

4、counting for the hiding and exposure effects among different size classes. An empirical formula is proposed to consider the effects of the gravity on the sediment transport capacity and the bed-load movement direction in channels with steep slopes. Flow and sediment transport are simulated in a deco

5、upled manner, but the sediment module adopts a coupling procedure for the computations of sediment transport, bed change, and bed material sorting. The model has been tested against several experimental and field cases, showing good agreement between the simulated results and measured data. Introduc

6、tion Because of the complexity of the turbulent flows with free water surface and movable channel bed, the numerical simulation of flow and sediment transport in open channels is very challenging. Its advancement can be attributed to many successful numerical techniques developed in the field of computational fluid dynamics. Among these techniques, the staggered grid approach (Harlow andWelsh 1965; Patankar 1980) and Rhie and Chows (1983)momentum interpolation method on a nonstagge