【摘要】 将以有限控制体积法(FVM)为基础的二维水流-水质模型应用于长江江苏段流场和浓度场模拟,结果表明:该二维模型是合理的、可靠的和有效的,FVM配合通量向量分裂格式(FVS)是一种高解析度的数值方法。此外,根据流场和浓度场4个特征时刻的分布特点,确定了污染带的最大范围,得到了各排污口排放量与污染带长度之间的相关关系。更多还原

【Abstract】 The basic equation of the finite volume method,FVM,is obtained using the divergence theorem after being integrated.In FVM the unstructured mesh is used to represent the computational domain.Firstly,the mass and momentum fluxes through each side of every cell are calculated according to the balance theory.Then the water elevation and depth-averaged velocity of each cell are obtained at the end of each time interval.Two-dimensional unsteady flow model is based on the finite volume method.One of the attractive features of this model is to treat the calculation of the mass and momentum flux across each side of elements as a local Riemann problem that is solved using the flux vector splitting scheme (FVS).In this paper,the flow of the Yangtze River reach in Jiangsu Province is simulated.The sample applications of this model have shown fairly satisfactory results.It is proved that FVM cooperated with FVS scheme is a high -resolution method.Additionally,according to the distribution peculiarity of the four characteristic moments,the maximal contamination zone of entire tide has been obtained.The relationship between the length of contamination zone and the pollutant load is derived respectively.更多还原