Numerical simulation for 2D multi-connected domain flows in a body-fitted curvilinear coordinate system

By using a multi-connected domain body-fitted curvilinear coordinate system, a B-type staggered grid and a technique of moving boundary, a 2D multi-connected domain flow mathematical model is developed to simulate the flow characteristics in complex boundary rivers. The physical domain is mapped into a uniform transformed space. The governing equations are firstly transformed from Cartesian coordinates to curvilinear coordinates, then discretized by the finite-volume method, and solved via SIMPLEC algorithm. The model is verified by measured physical data of BAISHIYAO River, and the comparison between numerical results and experimental data shows a very good agreement, which indicates that the model is fairly effective for simulating flow in rivers with complex boundaries.