涌潮作用下丁坝附近水流运动特性的数值模拟研究

采用压力隐式算子分割法(PISO)求解雷诺时均方程和RNGκ-ε紊流模型,建立了描述涌潮作用下丁坝附近水流运动规律的数学模型。水流的控制方程采用有限体积法离散,物理变量采用交错网格布置,自由表面应用流体体积(VOF)法追踪。该数学模型得到实测资料的验证后,数值模拟了钱塘江涌潮作用下丁坝附近的流场、自由水面、涌潮变形和涌潮压力的变化规律等。结果表明:丁坝附近水力特性受涌潮影响较大,来潮初始,丁坝附近紊动强烈,流场和自由水面变化很大;丁坝上涌潮压力急剧增大,且丁坝不同高程处的压力几乎都在同一时刻达到其最大值。

Study on flow characteristics near spur dikes under tidal bore

A mathematical model of tide flow motion nearby spur dikes is illustrated in this paper.The Reynolds equations and the RNG κ-ε turbulent model are solved by the pressure implicit splitting-operator(PISO) method.The governing equations are discretized by the finite volume method,and the physical pa rameters are arranged on a staggered grid,and the free surface is traced with volume of fluid method(VOF).The model is verified by the observation data,and the comparison between the numerical results and experimental data is in good agreement.The proposed model has been used to simulate the velocity vectors,free water surface,contours and bore pressures of the flow in the vincinity of a spur dike.It is found that the flow near the spur changes strongly,and bore pressures at different height on the groin rise rapidly at first,and then reach their maximum almost at the same time.