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首页> 外文期刊>Applied Ocean Research >URANS investigation of the interaction between the free surface and a shallowly submerged underwater vehicle at steady drift
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URANS investigation of the interaction between the free surface and a shallowly submerged underwater vehicle at steady drift

机译：urans在稳定漂移处调查自由表面与浅埋水下车辆之间的相互作用

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摘要

An axisymmetric underwater vehicle (UV) at a steady drift angle experiences the complex three-dimensional crossflow separation. This separation arises from the unfavorable circumferential pressure gradient developed from the windward side toward the leeward side. As is well known, the separated flow in the leeward side gives rise to the formation of a pair of vortices, which affects considerably the forces and moments acting on the UV. In this regard, the main purpose of the present study is to evaluate the role of the leeward vortical flow structure in the hydrodynamic behavior of a shallowly submerged UV at a moderate drift angle traveling beneath the free surface. Accordingly, the static drift tests are performed on the SUBOFF UV model using URANS equations coupled with a Reynolds stress turbulence model. The simulations are carried out in the commercial code STARCCM + at a constant advance velocity based on Froude number equal to F-n = 0.512 over submergence depths and drift angles ranging from h = 1.1D to h = infinity and from beta = 0 to beta = 18.11 degrees, respectively. The validation of the numerical model is partially conducted by using the existing experimental data of the forces and moment acting on the totally submerged bare hull model. Significant interaction between the low-pressure region created by the leeward vortical flow structure and the free surface is observed. As a result of this interaction, the leeward vortical flow structure appears to be largely responsible for the behavior of the forces and moments exerted on a shallowly submerged UV at steady drift.
机译：稳定漂移角的轴对称水下车辆（UV）经历复杂的三维横流分离。这种分离产生从迎风侧从迎风侧产生的不利的圆周压力梯度。众所周知，Leeward侧的分离流动产生了一对涡流的形成，这显着影响了在UV上作用的力和力矩。在这方面，本研究的主要目的是评估Leeward志法结构在自由表面下方行进的中等漂移角的浅​​层浸没UV的流体动力学行为中的作用。因此，使用与Reynolds应力湍流模型耦合的URANS方程，对缓冲UV模型进行静态漂移测试。在商业代码Starccm +中以等于Fn = 0.512的普通数量的恒定预付速度在普通的血液深度和漂移角度，从H = 1.1d到h =无穷大，并且从β= 0到β= 18.11程度分别。通过使用在完全浸没的裸壳模型上的力和时刻的现有实验数据部分地进行数值模型的验证。观察到由背风涡流结构和自由表面产生的低压区域之间的显着相互作用。由于这种相互作用，延新的涡流结构似乎基本上负责施加在稳定漂移的浅层浸没的UV上的力和时刻的行为。

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