模拟斜坡堤上越浪量一种新的数值模式

摘要

The numerical model was developed based on FLUENT software, Reynolds⁃Average Navier⁃Stokes equation and k⁃εturbulence model. A two dimensional numerical wave flume which can eliminate the secondary re⁃flection wave was developed based on the source wave⁃generation method and source wave⁃dissipating method, and it used the VOF method to trace free surface. Numerical result was compared with theoretical result of second⁃order Stokes wave to check the efficiency of wave generation. The numerical wave flume was used to simulate the overtop⁃ping of sloping seawall and the influence of platform width and gradient on overtopping was analyzed. At last, the trend was consistent through comparing with result of numerical and physical simulation. The result shows that the model is efficient and accurate on dealing with the overtopping and a new numerical model which is using FLUENT to simulate the overtopping of sloping seawall is established.%利用FLUENT软件，基于粘性不可压缩流体的雷诺时均N⁃S方程和k⁃ε湍流模型，采用有限体积法对控制方程进行离散，建立数学模型。基于质量源造波和动量源消波的方法，在连续方程和动量方程中加入造波源项和消波源项，采用VOF方法捕捉自由表面，开发了无反射造波的二维数值波浪水槽，通过数值模拟值和理论值的对比，对该数值波浪水槽进行了验证。进而，利用该数值波浪水槽模拟斜坡堤的越浪问题，分析了平台宽度、斜坡坡度对越浪量的影响，并将数值模拟结果和前人物模试验结果相对比，二者趋势一致，吻合良好，表明了该模型在处理斜坡堤越浪问题方面的有效性和精确性，从而建立了利用FLUENT模拟斜坡堤越浪问题一种新的数值模式。