通过大涡数值模拟研究了丁坝附近水流特性。在数值模拟过程中基本方程采用大涡模拟方程,由Smagorinsky模型得到小尺度涡粘性系数,在此基础上给出了大涡模拟数值计算方法;并利用试验观测数据,验证了数值模拟结果,同时比较了上挑、正挑、下挑3种淹没的不透水丁坝附近水流特性

Based on the largeeddy numerical simulation method,the flow properties around three kinds of spurdikes,i.e.,60° groyne,90° groyne and 120° groyne(the inclined angle representing an angle between the groyne with river bank),are studied.The basic equations for numerical simulation are the largeeddy simulation equations.The most widely used Smagorinsky model is adopted to represent the eddy viscosity coefficient in the subgridscale stresses.And then a numerical method is given.The computed results are detailedly verified by the experimental data.Finally,the velocily distributions around the three kinds of spurdikes are given and compared