2D Unstructured Dam-Break Model: Formulation and Validation; Conference paper

摘要

Two-dimensional simulations of dam-break flows using finite volume method and approximate Riemann solvers for computing the intercell fluxes have drawn growing attentions because of their robustness and abilities to handle mixed flows and discontinuities. Such models usually require complicated algorithms for treating source terms and second-order schemes for computing the intercell fluxes in order to gain numerically balanced solutions and accuracy, which often results in an excessively long computational time. With a view of developing an accurate and efficient model for real-life applications, this paper proposed a finite volume method, which uses the first-order HLL approximate Riemann solver for computing intercell fluxes and adopts the conservative form of the momentum equations with one source term representing the driving forces in each equation. Such treatment can easily eliminate numerical imbalance between source and flux terms without introducing complicated algorithms. The accuracy and improvement in computational efficiency of the newly developed model are demonstrated by means of a real- life test example.