重庆双碑嘉陵江大桥桥区平面二维水流数值模拟

从平面二维水动力学方程组出发,根据有限元Galerkin加权余量法离散模型方程组,并利用Newton-Raph-son迭代法求解,成功地模拟了重庆双碑嘉陵江大桥桥区河道水流流场.经综合分析,得出大桥的建设对通航水流的影响很小.     

一种GIS支持下的点源污染数值模型

利用地理信息系统先进的空间数据管理功能和模型分析能力，将流域水环境质量、水污染状况及地理信息等集合在一起，用先进的技术手段，对其进行综合分析、计算、评价，建立了水质模型，在GIS系统内开发了一套适体坐标下的深度平均的点源污染模型，经验证，效果良好。     

平面二维全沙泥沙输移数学模型及其应用

研究了平面二维全沙泥沙输移(悬移质泥沙和推移质泥沙)的数学模型及其应用．中对比了国内外常用模型的特点,结合笔在平面二维全沙泥沙输移数学模型中的计算经验,分析各自模型的差异,特别是针对模型的数值计算方法及湍流模型的应用进行分析和说明,在此基础上建立平面二维全沙泥沙输移数学模型SFST—2D．并将该模型分别应用于长江三峡工程坝区泥沙计算、波迪一。科西工程水库内淤积及下游冲刷等工程实例的研究中。     

Depth-averaged Nonlinear k-ε Model and Technique for Its Program Development

Without the 'rigid lid' assumption, the depth-averaged linear k-ε model can describe the change of water depth. However, it is incapable of accurately simul ating turbulent flows, where the normal Reynolds stresses play an important role. A de pth-averaged nonlinear k-ε model is developed taking into account the stress relations described by Speziale. The depth-averaged linear and nonlinear k-ε models can both be used to calculate the flow field near a side discharge into open-channel flo w, but the results of the nonlinear model are in much closer agreement with experimental re sults. Furthermore, the technique of changing the 2D linear k-ε program i nto a depth-averaged, nonlinear program is presented.     

泊肃叶流的强非线性表面长波

考虑了在单层泊肃叶流背景下的强非线性长波,其中唯一假设为水深与特征波长之比为小量,建立了基于平均速度为速度变量的模型.由于在推导过程中未对波幅做任何假设,因而获得的模型具有更广的适用范围.     

Computing Depth-averaged Flows Using Boundary-fitted Coordinates and Staggered Grids

Introduction　　Foropenchannelflow,thedepth-averagednonlineark-εmodelisvalidwhenthewidth-to-depthratioislargeandtheverticalvariationofthemean-flowquantitiesisnotsignificant.Fornaturalirregularboundaries,acoarsegriddistributionresultsin‘stairstepped’or‘blockedoff’approximationswhichmayresultinpoorresolution.Theboundary-fittedcoordinatestechniqueisusedtoovercomethesedeficiencies.Withboundary-fittedcoordinates,thecollocatedgridsystemisoftenusedtosimplifytheprogrammingbutthismaycreatea‘check…