2D Flow And Contaminant Transport Simulation Based On The Finite Volume Method

During the past decades, with the development of the economics, the industrialization and urbanization process have speed up in China. Meanwhile, abundant industrial and municipal wastewater is discharged into surface water bodies like rivers and lakes, which results in the serious water pollution, and aggravates the shortage of the water resources and even threatens the exist of mankind and sustainable development of the society and economics. Therefore, the protection and improvement of water environment became an urgent and arduous task. The research on numerical simulation technology for modeling the contaminant transport problems is of great interest for the practical engineering because it could provide technology support for the protection and improvement of water environment.The unstructured mesh Finite Volume Method (FVM) based on discontinuous theory has gained tremendous success in the simulation of shallow water, because it has virtues of conservation, automatically upwinded and abilities of dealing with discontinuous problems and complex geometry boundary. Now, the FVM is applied to the simulation of contaminant transport step by step. It is intended to study the 2D flow and contaminant transport by using the new technology which is based on FVM. Firstly, it introduces the numerical approximation method to 2D flow and water quality equation. Then it is to study the key technologies of solving 2D flow and water quality equation, such as flux computation at the boundary of Finite Volume, the approach of dealing with the irregular topography, open boundary and land boundary, moving boundary and the diffusion term of equation and et. al. In this paper the gradient bottom model is modified to deal with the complicated topography, and three formulas for the flux computation through boundary of control volume are validated. Moreover, the Two-Point Gauss formula is employed to calculate the average flux at the boundary of finite volume. A new approach is proposed to deal with moving boundary which is fitted for the finite volume method. Next, the integration technology of simulation software is carried out, and it is to build the simulation software based on the Component Technology, in which the key Calculation Component based on the OOP Method and implement visualization based on the MapWinGIS Component is applied. At last, the developed numerical model is verified not only by using the experimental data and numerical test, but also using the field measurement of the cooling water of Taishan nuclear power station. From the verification, it is found that the proposed model is powerful to deal with the complex boundary conditions and is feasible to simulate the flow and contaminat transport in surface water bodies.