In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transf...In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transform method in an arbitrary complex region. The Navier-Stokes equations for two-dimensional incompressible viscous flows are discretized in the Body Fitted Coordinate （BFC） system. The transformed SIMPLE algorithm is proposed to modify the pressure-velocity field and a transformed VOF method is used to trace the free surface. Hydrodynamic characteristics on an arc crown wall are obtained by the improved numerical model based on the BFC system （BFC model）. The velocity field, the pressure field and the time profiles of the water surface near the arc crown wall obtained by using the BFC model and the Cartesian model are compared. The BFC model is verified by experimental results.展开更多
针对笛卡尔坐标系下的VOF(volume of fluid)方法无法精确模拟复杂边界的自由表面流动问题,以连续方程和雷诺平均方程为基本控制方程,采用k-ε湍流模型来封闭方程组,修正了基于交错网格的贴体坐标系下的SIMPLE算法来迭代求解压力-速度场...针对笛卡尔坐标系下的VOF(volume of fluid)方法无法精确模拟复杂边界的自由表面流动问题,以连续方程和雷诺平均方程为基本控制方程,采用k-ε湍流模型来封闭方程组,修正了基于交错网格的贴体坐标系下的SIMPLE算法来迭代求解压力-速度场,修正了贴体坐标系下的界面跟踪方法,建立了基于BFC-VOF方法求解波浪对弧形胸墙结构作用的数值计算模型.对弧形胸墙结构附近的波面、流场及其所受波浪力等进行了数值模拟.研究结果表明:贴体网格模型能够精确模拟复杂边界的自由表面流动问题,模型计算的弧形胸墙迎浪面所受到的波浪力随着圆弧半径的增大而减小.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 51179030, 50921001)
文摘In the present study, a new algorithm based on the Volume Of Fluid （VOF） method is developed to simulate the hydrodynamic characteristics on an arc crown wall. Structured grids are generated by the coordinate transform method in an arbitrary complex region. The Navier-Stokes equations for two-dimensional incompressible viscous flows are discretized in the Body Fitted Coordinate （BFC） system. The transformed SIMPLE algorithm is proposed to modify the pressure-velocity field and a transformed VOF method is used to trace the free surface. Hydrodynamic characteristics on an arc crown wall are obtained by the improved numerical model based on the BFC system （BFC model）. The velocity field, the pressure field and the time profiles of the water surface near the arc crown wall obtained by using the BFC model and the Cartesian model are compared. The BFC model is verified by experimental results.
文摘针对笛卡尔坐标系下的VOF(volume of fluid)方法无法精确模拟复杂边界的自由表面流动问题,以连续方程和雷诺平均方程为基本控制方程,采用k-ε湍流模型来封闭方程组,修正了基于交错网格的贴体坐标系下的SIMPLE算法来迭代求解压力-速度场,修正了贴体坐标系下的界面跟踪方法,建立了基于BFC-VOF方法求解波浪对弧形胸墙结构作用的数值计算模型.对弧形胸墙结构附近的波面、流场及其所受波浪力等进行了数值模拟.研究结果表明:贴体网格模型能够精确模拟复杂边界的自由表面流动问题,模型计算的弧形胸墙迎浪面所受到的波浪力随着圆弧半径的增大而减小.
