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首页> 外文期刊>Applied Mathematical Modelling >Numerical investigation of body and hole effects on the cavitating flow behind a disk cavitator at extremely low cavitation numbers
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Numerical investigation of body and hole effects on the cavitating flow behind a disk cavitator at extremely low cavitation numbers

机译：极低空化数下体和孔对圆盘空化器后面空化流影响的数值研究

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Supercavitation has been recently proposed as an effective method for drag reduction of underwater vehicles. For this purpose, a cavitator is used to generate a large continuous bubble to cover the vehicle. Extremely low cavitation numbers are required in these applications to provide a sufficiently voluminous cavity. In this study, the effects of body presence inside the cavity of a disk-shaped cavitator are studied numerically. An element based finite volume approach is used for solving Reynolds-averaged Navier-Stokes equations. In order to validate the numerical scheme, turbulence and cavitation models, the cavitating flow over a hemispherical nosed cylinder body and also behind a disk-shaped cavitator has been simulated and the numerical results are validated against existing analytical and experimental data. Next, the effects of body presence inside the cavity of the disk-cavitator on the cavity characteristics are investigated. Results show that the cavity length is slightly smaller when it closes on the body, in comparison with the freely-closing cavity. Furthermore, the effects of adding a concentric hole with various diameters to the disk-cavitator on the cavity features are examined. The degree of drag reduction and changes of the cavity dimensions are determined at various cavitation numbers.
机译：最近，提出了超空化作为降低水下航行器阻力的有效方法。为此，空化器用于产生较大的连续气泡以覆盖车辆。在这些应用中需要极低的空化数以提供足够大的空腔。在这项研究中，数值研究了盘形空化器腔体内物体存在的影响。基于元素的有限体积方法用于求解雷诺平均Navier-Stokes方程。为了验证数值方案，湍流和空化模型，对半球形鼻形圆柱体以及圆盘状空化器后面的空化流进行了模拟，并根据现有的分析和实验数据对数值结果进行了验证。接下来，研究了在圆盘空化器的腔体内存在的物体对腔特性的影响。结果表明，与自由闭合的腔体相比，腔体在闭合时的长度略短。此外，研究了在空腔特征上向圆盘空化器添加不同直径的同心孔的效果。减阻程度和型腔尺寸的变化是在各种空化次数下确定的。

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