Studying For Three-dimensional Numerical Simulation Of Ice Jam Accumulation In Curved River Section

Ice jam is an important factor that could cause the flood disasters in rivers at high-latitude area, so it is of great practical significance to study the inherence theory of ice-water movement to avoid the occurrence of ice-jam flood. With the rapid development of the computer technology, the mathematic model is adopted more and more when it comes to study in the ice-jam phenomenon in the rivers. The mathematical model has become an important method when studying the rules of the ice-water movement due to its characteristics of convenience, high effectiveness and low cost. In this paper, the purpose of studying is to obtain the thickness of ice jam and its distribution through the mathematic model, aiming at sinuous and irregular boundary in the Curved River Section, the curvilinear grid is generated adopted the technique of boundary-fitting curvilinear coordinate transformation. Try to establish a three-dimensional ice-water model based on the boundary-fitting curvilinear coordinate system adopted in the horizontal x-y plane andσ-coordinate transformation in the vertical direction. Discreting the governing equation of the k–εturbulent flow model based on the Finite Volume Methods (FVM). All the variables are calculated at the same control volume by using the non-staggered grids. In order to prevent the pressure oscillation on non-staggered grids, an interpolation method called momentum interpolation is presented to evaluate the cell-face velocity. The discretization equations were solved using the SIMPLEC algorithms. In view of frazil ice evolution is very similar to the sediment movement in rivers, frazil transport and the form of cover load transport are both taken into account to accomplish the numerical simulation of frazil ice accumulation. The model was used to simulate ice jam accumulation in the curved channel at the laboratory. The results showed well agreement with the experimental data. This indicates the three-dimensional model has a certain substantial results and the work in this paper accumulates some precious experience for simulation the ice jam phenomenon in the natural river.