波浪作用下锚链系泊浮式防波堤动力响应的数值模型研究

Study on numerical model of hydrodynamics of mooring line floating breakwater under wave actions

浮式防波堤充分利用波能在水深方向的分布特性,在满足工程消浪要求的同时对海域水沙交换影响较小,且能够快速布置,在某些实际工程有一定应用前景。为了深入了解波浪作用下浮式防波堤的动力响应,基于OpenFOAM标准求解器olaFlow,在刚体运动求解计算中植入锚链求解模块MOODY(mooring cable dynamics),实现了基于重叠网格方法的浮体运动与锚链受力耦合求解,建立了锚链系泊浮式防波堤动力响应的二维数值模型。利用该数值模型对锚链系泊单方箱浮式防波堤在波浪作用下的透射系数、运动响应、锚链张力进行了模拟,并和相关试验结果进行了比较。结果表明,模型能够准确模拟二维波浪和浮式防波堤的相互作用,并用于三维模型的改进。

The floating breakwater(FBW)has advantages in utilization of wave energy distribution along the vertical direction,wave attenuation,application,and water-sediment transportation,and has application prospects in the ocean and coastal engineering.Based on the OpenFOAM solver olaFlow,the MOODY(mooring cable dynamics)module is implanted in rigid body motion calculation,and the coupling of the FBW motion and mooring force based on the overset grid method is achieved.Furthermore,a two-dimensional numerical model for the hydrodynamic characteristics of FBW is established.The numerical results of hydrodynamic characteristics(transmission coefficient,motion response,mooring force)of the box-type FBW under wave actions are validated by experiments,which show that the model can be used to simulate the two dimensions interactions between the motion response of the FBW and wave actions,and be improved to three dimensions.