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| 1 | Computational and Empirical Investigation of Propeller Tip Vortex Cavitation Noise显示文摘In this study,non-cavitating and cavitating flow around the benchmark DTMB 4119 model propeller are solved using both viscous and potential based solvers.Cavitating and non-cavitating propeller radiated noises are then predicted by using a hybrid method in which RANS(Reynolds-averaged Navier-Stokes)and FWH(Ffowcs Williams Hawkings)equations are solved together in open water conditions.Sheet cavitation on the propeller blades is modelled by using a VOF(Volume of Fiuld)method equipped with Schnerr-Sauer cavitation model.Nevertheless,tip vortex cavitation noise is estimated by using two different semi-empirical techniques,namely Tip Vortex Index(TVI,based on potential flow theory)and Tip Vortex Contribution(TVC).As the reference distance between noise source and receiver is not defined in open water case for TVI technique,one of the outputs of this study is to propose a reference distance for TVI technique by coupling two semi-empirical techniques and ITTC distance normalization.At the defined distance,the starting point of the tip vortex cavitation is determined for different advance ratios and cavitation numbers using potential flow solver.Also,it is examined that whether the hybrid method and potential flow solver give the same noise results at the inception point of tip vortex cavitation.Results show that TVI method based on potential flow theory is reliable and can practically be used to replace the hybrid method(RANS with FWH approach)when tip vortex cavitation starts. | Savas SEZEN Sakir BAL | 2020 | China Ocean Engineering2020，34，2： | 3 |
| 2 | Numerical Simulation of the Flow around Two-dimensional Partially Cavitating Hydrofoils显示文摘在现在的学习,一条新途径被用于洞预言为二维(2D ) 由潜力的水翼船基于边界元素方法(BEM ) 。边界元素方法被 Dirichlet 类型边界条件的使用在面板表面和洞表面上与来源和马甲分布一起对待。一条反复的答案途径被用来决定洞形状在上部分 cavitating 水翼船。在一个指定成穴数字和洞长度的情况中,反复的答案方法由排水量厚度的增加或减法继续水翼船的洞表面。适当的洞形状被洞表面的动态边界条件和整个陪衬表面的运动学的边界条件包括洞获得。为一个给定的成穴数字, 2D 水翼船的洞长度在不同的洞长度之中根据最小的错误标准被决定,它在洞表面上满足动态边界条件。NACA 16006, NACA 16012 和 NACA 16015 水翼船节为攻击的二个角度被调查。结果与另外的潜在的基于的边界元素代码, PCPAN 和商业 CFD 代码相比(流畅) 。因而,从二条维的途径获得的结果与那些从其它获得了一致,这被显示出。 | Fahri Celik Yasemin Arikan Ozden Sakir Bal | 2014 | Journal of Marine Science and Application2014，13，3： | 2 |
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