【作者】 吴定坤； 王建华； 万德成；

【Author】 WU Ding-kun;WANG Jian-hua;WAN De-cheng;Computational Marine Hydrodynamics Lab (CMHL),State Key Laboratory of Ocean Engineering,School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University;

【机构】 上海交通大学船海计算水动力学研究中心(CMHL)船舶海洋与建筑工程学院海洋工程国家重点实验室；

【摘要】 船舶高速航行时船艏处会经常发生波浪破碎现象,艏波破碎会伴随着复杂的流场变形还会造成能量损失形成破波阻力,对艏波破碎流场的数值模拟是目前水动力学研究中最为复杂的问题之一。本研究采用基于OpenFOAM自主开发的求解器naoe-FOAM-SJTU,针对标准船模DTMB进行了艏波破碎的数值模拟。计算离散方法采用有限体积法,利用RANS方法求解流场,VOF方法捕捉自由液面。计算工况为出现稳定破波形态的航速Fr=0.35,对船体阻力进行预报,并与模型试验结果进行对比验证,用不同尺度的网格开展网格收敛性研究。利用DDES方法计算模拟艏波破碎现象,给出了该航速下的兴波波形,自由面附近涡量场等流场信息,对比分析了自由液面的破波情况,结果表明DDES在获取艏波破碎过程的细节上有很大的优势,能够比RANS捕捉到更多的自由面凹陷和翻卷空隙验证了当前CFD方法对艏波破碎模拟的可行性。更多还原

【Abstract】 When ships sail at high speed,wave breakage often occurs at the bow,and the bow wave breakage will be accompanied by complex flow field deformation,resulting in energy loss and wave breaking resistance.In this study,naoe-FOAM-SJTU,a self-developed solver based on OpenFOAM,was used to simulate the bow wave breaking of the standard ship model DTMB.The finite volume method is used for discrete calculation,RANS method is used to solve the flow field,and VOF method is used to capture the free liquid surface.The calculation condition is that the speed Fr=0.35 with stable wave breaking pattern,and the hull resistance is predicted and compared with the model test results,and the grid convergence is studied with different scales of grids.Using DDES and RANS methods to calculate and simulate the bow wave breaking phenomenon respectively,the wave-making waveform and vorticity field near the free surface at this speed are given,and the wave breaking situation of the free surface is compared and analyzed.The results show that DDES has great advantages in obtaining the details of bow wave breaking process,and can capture more free surface depressions and rolling gaps than RANS,which proves the feasibility of the current CFD method for bow wave breaking simulation.更多还原