CFD方法模拟高航速DTMB5415艏波破碎  

CFD simulation of breaking bow wave of high speed DTMB 5415

作　　者：吴定坤 王建华[1] 万德成[1] WU Ding-kun;WANG Jian-hua;WAN De-cheng(Computational Marine Hydrodynamics Lab(CMHL),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]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,上海200240

出　　处：《水动力学研究与进展（A辑）》2021年第1期20-27,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51809169,51879159);长江学者奖励计划(T2014099);国家重点研发计划项目(2019-YFB1704200,2019YFC0312400);工信部数值水池创新专项课题(2016-23/09)。

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。该研究采用基于Open FOAM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,并与模型实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和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。When ships sail at high speed, wave breaking often occurs at the bow, and the breaking bow wave will be accompanied by complex flow field, resulting in energy loss and wave breaking resistance. At present, the physics and mechanisms of breaking wave are hard to investigate by experiment. Computational Fluid Dynamics(CFD) method, which can capture more detail of flow field, are usually used to simulate high Reynolds number phenomenon. In this study,naoe-FOAM-SJTU, a self-developed solver based on OpenFOAM, was used to simulate the breaking bow wave of DTMB5415 ship model at Fr=0.35. Reynolds-Averaged Navier-Stokes(RANS) approach is used to solve the flow field, and Volume of Fluid(VOF) technique is used to capture the free surface. Wave elevation and the hull resistance are predicted and compared with the results of experiment, and three different scales of grids are used to verify the grid convergence. Delayed detached eddy simulation(DDES) method is also used to predict the breaking bow wave phenomenon. The wave elevation and vorticity field in the bow wave region are presented and analyzed. The results show that DDES is better at resolving the details of breaking bow wave process than RANS.

关 键 词：DTMB5415 艏波破碎 DDES naoe-FOAM-SJTU求解器 

分 类 号：O357[理学—流体力学]