基于FLUENT的垂向二维数值波浪水槽的造波效果  

Wave making effect of vertical two-dimension numerical wave tank based on FLUENT

作　　者：童朝锋[1] 魏芷阳 孟艳秋[1] TONG Chao-feng;WEI Zhi-yang;MENG Yan-qiu(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《水运工程》2020年第3期13-20,共8页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2017YFC0405402);国家自然科学基金重点项目(51339005)。

摘　　要：建立精准的数值波浪水槽需要选取合适的造波方法、波浪方程和网格尺寸。利用FLUENT流体力学模型,采用源项法、推板法、速度边界法3种造波方法,分别建立不同网格尺寸和波陡条件下的数值波浪水槽。结合相应的波浪理论,比较采用各造波法的数值一阶线性波和二阶Stokes波、三阶Stokes波效果,得出数值波传播特点、适宜网格尺度及波陡对数值波效果影响。结果表明,源项造波法造波的波高沿水槽衰减最快,对网格尺寸变化最敏感;推板造波法数值造波效果最好;速度边界造波法计算效率最高,数值波高沿水槽衰减速度最小;在数值水槽的波浪传播有非线性作用影响,导致即使造波是线性波,传播到一定距离后,波面也有非线性变形。Appropriate wave generation methods,wave equations and mesh size should be provided as setting up an exact numerical wave tank. Based on FLUENT model,we adopt three wave generation methods,including the source term method,pushing plate method,boundary velocity method to set up numerical tanks for wave simulation of different mesh size and different wave steepness. Combining with the corresponding wave theory,we comparing the effects of numerical first-order linear wave,second-order Stokes wave and third-order Stokes wave by three wave generation methods,and obtain the characteristics of numerical wave propagation,the appropriate grid scale and the influence of wave steepness on the numerical wave effect. The results show that the numerical wave height using the source term method attenuates relative sharply,it is the most sensitive to the change of mesh size. The simulation results using the push plate method is the most exact. The computation efficiency for the velocity boundary wave making method is the highest. The wave height attenuation speed is the slowest. The wave propagation in the numerical flume has the nonlinear effect. The nonlinear the influence during transportation can be observed,and it causes the nonlinear deformation of the wave surface even if the making wave is linear.

关 键 词：FLUENT 数值波浪水槽 造波效果 STOKES波 

分 类 号：P731.22[天文地球—海洋科学] U652[交通运输工程—港口、海岸及近海工程]