基于物理造波和主动消波的黏性数值波浪水槽开发

基于推板造波理论和摇板造波理论,在Open FOAM平台上采用重叠网格技术建立黏性数值波浪水槽,并使用一种结合SIMPLE算法和PISO算法的PIMPLE算法对数值模型进行求解。利用开发的数值模型通过数值收敛性测试和网格独立性测试分别重点研究了时间步长、库朗数和网格尺寸对数值精度和计算效率的影响。并对比研究了此数值模型分别嵌入层流模型和湍流模型的计算精度和计算效率。实现的规则波和二阶有限振幅波与理论结果和试验结果吻合,验证了此黏性数值波浪水槽的造波和主动消波功能。基于二维数值波浪水槽,进一步研究了三维数值造波,数值计算结果与理论结果吻合良好。研究结果不仅验证了重叠网格在二维和三维两相流体域中求解运动物体与流场交互的可靠性和正确性,而且为使用此黏性数值波浪水槽解决更复杂的海洋工程问题提供了依据。

Development of a viscous numerical wave flume based on physical wave generation and active wave absorption

A viscous numerical wave flume is established by using overset mesh technology based on the theory of piston wavemaker and the theory of flap wavemaker. The numerical model is solved by a PIMPLE algorithm based on the combination of the SIMPLE algorithm and the PISO algorithm. Using the test of the numerical convergence and grid independence, the effects of the time step, courant number and mesh size on the numerical precision and computational efficiency of the overset mesh model are studied. The numerical model uses the laminar flow model and the turbulence model separately. A comparative study of computational accuracy and computational efficiency is carried out for these models. The numerical calculation results agree well with the theoretical results and experimental results, and the wave-making and active wave-absorbing functions of the viscous numerical wave flume are verified. On the basis of 2D numerical wave flume, 3D wave generation is further studied, and the numerical results agree well with the theoretical results. This study not only verifies the reliability and correctness of solving the interactions between moving objects and flow fields with overset meshes in the two-dimensional and three-dimensional two-phase fluid domains, but also provides a basis for solving complex ocean engineering problems using this viscous numerical wave flume.