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A comparative study of two cavitation modeling strategies for simulation of inviscid cavitating flows

机译：两种模拟空化流的空化建模策略的比较研究

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摘要

In the present work, two cavitation modeling strategies, namely the barotropic cavitation model and the transport equation-based model are applied and assessed for the numerical simulation of inviscid cavitating flows over two-dimensional and axisymmetric geometries. The algorithm uses the preconditioned Euler equations employing the interface capturing method for both the cavitation models. A same numerical solution procedure is used herein for discretizing the governing equations resulting from these two cavitation modeling strategies for the assessment to be valid and reliable. A central difference finite-volume scheme employing the suitable dissipation terms to account for density jumps across the cavity interface is shown to yield an effective method for solving the Euler equations. Results for steady inviscid cavitating flows over the NACA0012 and NACA66(MOD) hydrofoils and the hemispherical and ogive head shape bodies are obtained by applying these two cavitation modeling strategies and they are compared with each other for different conditions. A sensitivity study is conducted to evaluate the effects of various numerical and physical parameters involved in each cavitation model on the solution. The advantages and drawbacks of these two strategies for modeling of cavitating flows are also discussed. The present inviscid cavitation results are also compared with the experiments and the other inviscid and viscous cavitation results performed by other researchers and some conclusions are made. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在目前的工作中，应用了两种空化建模策略，即正压空化模型和基于输运方程的模型，并对二维​​和轴对称几何形状上的无粘性空化流进行了数值模拟。该算法将预处理的Euler方程用于两个空化模型，并采用接口捕获方法。本文使用相同的数值求解程序来离散化由这两种气蚀建模策略得出的控制方程，以使评估有效且可靠。中心差分有限体积方案采用适当的耗散项来解决腔体界面上的密度跃变，显示出一种求解欧拉方程的有效方法。通过应用这两种空化建模策略，获得了在NACA0012和NACA66（MOD）水翼上以及半球形和弓形头部形体上的稳定无粘性空化流的结果，并将它们在不同条件下进行了比较。进行了敏感性研究，以评估每种空化模型所涉及的各种数值和物理参数对溶液的影响。还讨论了这两种用于空化流建模的策略的优缺点。还将当前的无粘空化结果与实验进行了比较，并由其他研究人员进行了其他无粘稠化的空化结果，并得出了一些结论。 （C）2015 Elsevier Ltd.保留所有权利。

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