海洋波流环境的拉格朗日数值模拟  

Lagrangian Simulation of Wave-Current Environment

作　　者：贺铭 王洪树[1] 高喜峰 徐万海[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]大连理工大学海岸和近海工程国家重点实验室,大连116023

出　　处：《中国造船》2017年第A01期19-27,共9页Shipbuilding of China

基　　金：国家自然科学基金面上项目（51379144、51479135、51679167、51709201）;天津市自然科学基金青年项目（15JCQNJC07700）;大连理工大学海岸和近海工程国家重点实验室开放课题基金资助项目（LP1705）

摘　　要：论文基于SPH方法,建立了模拟海洋波流环境的拉格朗日型水动力数学模型.波浪场由计算域端部的推 板造波机生成,并由另一端的阻尼层吸收.入流与出流边界设置在计算域底部,通过对入出流区域内流体旅 加指定速度和压力,并建立两区域间的流体循环关系,使计算域内形成均匀流场.另外,在数值模拟初期阶 段引入了入流缓冲处理和自由液面“刚盖”处理方法,不仅提升了数值计算的稳定性,还极大地缩短了波流场 初期不稳定时间.最后,采用建立的数学模型对已有文献中的波流耦合试验进行了数值重现,结果表明所 建立的数学模型可以准确地模拟波浪、均匀水流以及两者间的相互作用,波流同向时,流场作用导致波陡降 低,波浪作用改变流场速度分布.Based on the SPH method,a Lagrangian hydrodynamic model is built to simulate wave-current coupling. The wave is generated with a piston-type of wave-maker set at one end of the tank, and is absorbed by an artificial damping layer set at another end. Inflow region and outflow region is below the bottom of the tank. By imposing assigned velocity and pressure in these two regions, together with a fluid circulation between them, a uniform flow is formed in the computational domain. In addition, at the initial stage of simulation, the velocities of inflow and outflow are buffered by using a ramp function, and rigid-lid treatment is implemented on the free surface of fluid. In this way, the numerical model proves to be more stable, and the time period of simulation will be greatly shortened. An available physical experiment concerning wave-current coupling is reproduced with the present model. It is shown that the established numerical model is capable of simulating wave, current and their interaction accurately. The wave steepness becomes smaller when interacted with following current, and the flow field fluctuates periodically under the action of the wave.

关 键 词：波流相互作用 耦合数学模型 数值波流水槽 拉格朗日法 SPH方法 

分 类 号：TV139.2[水利工程—水力学及河流动力学]