1. 大连理工大学 海岸和近海工程国家重点实验室， 辽宁 大连 116024；2. 大连理工大学 深海工程研究中心， 辽宁 大连 116024； 3. 国家海洋环境监测中心， 辽宁 大连 11602
出版日期:2020-01-28发布日期:2020-01-16通讯作者:孙家文，男，副研究员，E-mail: sunjw84@126.com.作者简介:马哲（1983-），男，辽宁省锦州市人，博士，讲师，研究方向为深海浮式结构概念设计及水动力性能分析.基金资助:国家自然科学基金(51651902), 辽宁省自然科学基金(201601056), 中央高校基本科研业务费专项资金（DUT19JC47）资助项目Numerical Simulation of Nonlinear Wave Based on an Improved Source Wave Method
MA Zhe 1, 2，ZHOU Ting 2，SUN Jiawen 1, 3，FANG Kezhao 1，ZHAI Gangjun 1, 21. State Key Laboratory of Coastal and Offshore Engineering, Dalian Univerdity of Technology, Dalian 116024, Liaoning, China; 2. Deepwater Engineering Research Center, Dalian University of Technology, Dalian 116024, Liaoning, China; 3. National Marine Environmental Monitoring Center, Dalian 116023, Liaoning, China
Online:2020-01-28Published:2020-01-16摘要/Abstract
摘要： 传统的质量源造波方法在强非线性波浪模拟过程中精度不高，不同波况造波源区初始设置较为复杂, 针对这些问题本文提出了改进方法.考虑质量源区双向质量输出(横向和垂向)，改进质量源源强函数并进行理论推导；基于OpenFOAM开源程序开展网格和时间步长收敛性验证；讨论在不同相对水深以及不同非线性强度条件下，二阶Stokes波幅值和相位与文献中传统方法模拟结果的相对误差，并对孤立波的传播过程进行模拟分析.数值模拟结果表明，改进方法不仅能提高效率，而且能提高质量源造波在较强非线性范围的模拟精度，尤其在非线性强度参数为0.2时，波幅及相位误差相对于传统方法分别降低21.7%和46.5%.
关键词: 质量源造波； 源区形状； 波浪非线性； OpenFOAM； 孤立波
Abstract: In the traditional mass source wave method, the accuracy is not high in the process of strong non-linear wave simulation, and the original setting of wave source area is complicated in different wave conditions. An improved method is proposed in this paper. Bidirectional quality outputs of the source area (lateral and vertical) are considered simultaneously, and the source function is improved and performed by theoretical derivation. The convergences of mesh and time step are verified based on the OpenFOAM program. The relative errors of second-order Stokes wave in amplitude and phase, comparing with traditional results, are discussed under different relative depths and different nonlinearity conditions. Then, a further simulation of the solitary waves propagation is performed. The numerical results show that the improved method can not only increase the efficiency but also improve the simulation accuracy of the mass source method in the high nonlinear range, especially when the nonlinearity parameter is 0.2, the amplitude error and the phase error are reduced by 21.7% and 46.5% respectively, compared to traditional ones.
Key words: mass source wave; source area shape; wave nonlinearity; OpenFOAM; solitary wave
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