基于等面积法的透空式隔流墙二维水流数值模拟研究

Numerical Simulation of Two-dimensional Water Flow through a Permeable Bulkhead Based on the Equal Area Method

底部透空式隔流墙是一种常用于改善引航道口门区水流条件的工程措施,以往都是在物理模型中研究其改善效果,在常规水深平均的平面二维数学模型中难以处理。开展了八字嘴枢纽整体物理模型试验,测定了多种工况下不同透空式隔流墙布置条件下口门区详细水流条件,基于等面积法建立了透空式隔流墙二维水流数学模型,通过与物理模型试验结果对比,得出:①在隔流墙掩护区域内,矢量流速及横向流速大小的计算值较实际值均偏大;②在隔流墙掩护区域外,矢量流速及横向流速大小的计算值与实际值均非常接近;③等面积透空法能很好地解决二维数值计算中难以模拟透空式隔流墙的问题。

The bottom-permeable partition wall is an engineering measure commonly used to improve the flow conditions in the entrance area of the approach channel.As it’s difficult to deal with the bottom-permeable in the two-dimensional mathematical model of the conventional water depth average,the improvement effect in the physical model was once studied.In this paper,the overall physical model test of the Bazizui hub is carried out,and the detailed flow conditions of the entrance area under walls of different length are determined.The two-dimensional flow of the permeable partition wall is established based on the equal area method.The mathematical model,compared with the physical model test results,shows that:①in the shield wall area,the calculated values of the flow velocity vector and the transverse velocity are more important than the actual values;②Outside the barrier wall cover area,the calculated values of flow velocity vector and transverse velocity are very close to the actual values;③The equal-area permeable method can solve the problem so well that it is difficult to simulate a transparent partition wall in two-dimensional numerical calculations.