摘要
对海洋工程结构物的经济性乃至安全性来说,其水动力学性能的精准预报对其设计具有重要意义。波浪与圆柱之间的相互作用对圆柱周围流场产生严重的非线性干扰,使自由液面产生明显的衍射现象。在对这样的现象进行模拟时,势流方法没有考虑到黏性带来的阻力作用,而完全针对黏性流体的计算流体力学(CFD)求解又在资源占用上非常劣势。该文以纯黏性CFD求解器naoe-FOAM-SJTU为基础,通过高阶谱(HOS)方法进行造波,在保证圆柱附近流场精细化计算的同时,降低外部大范围计算域所需的计算时间和存储空间,对在规则波中单个直立固定圆柱周围的波浪爬升进行了模拟计算,将波浪爬升的数据与纯CFD求解得出的结果进行了对比,且通过快速Fourier变换分析了对波浪爬升产生影响的主要波浪成分。此外,该文还通过对比不同黏性计算域布置下的HOS-CFD耦合模拟波面的衍射情况以及HOS-CFD耦合模拟与纯CFD模拟的计算速率,讨论了HOS-CFD耦合模拟中黏性计算域的参考布置尺寸。
For the economy and even safety of the ocean engineering structure, the precise prediction of the hydrodynamic performance is one crucial aspect for its design. Highly non-linear effect around the vertical cylinder is induced by the interaction of wave and the cylinder, which result in an obvious phenomenon of diffraction named "ringing". When it comes to simulation, potential flow method neglects the influence of viscosity, while the full viscous CFD simulation is of great spend of computational source. Based on our in-house full viscous CFD solver naoe-FOAM-SJTU, combined with the HOS-NWT, the present work simulates the wave elevation around the single vertical cylinder in the regular wave with high accuracy solution ensured in the viscous domain near the cylinder, and decreases the computation scales in outer domain. The data is compared with the result of full CFD solution, and main wave components of surface elevation are picked out with fast Fourier analysis. Furthermore, in order to discuss the appropriate size of the viscous domain, wave diffractions of different sets of viscous domains are compared as well as the calculation efficiency of HOS-CFD combined simulation and full CFD simulation.
作者
韩勃
赵伟文
万德成
HAN Bo;ZHAO Wei-wen;WAN De-cheng(Computational Marine Hydrodynamics Lab(CMHL),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2021年第2期228-236,共9页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金项目(51879159)
国家重点研发计划项目(2019YFB1704200,2019YFC0312400)
长江学者奖励计划(T2014099)。
