新型非线性动态气蚀模型的开发及其数值验证

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Haidong Yu,Xiaobo Quan,Haipeng Wei,Matevž Dular, Song Fu
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引用次数: 0

摘要

针对空化气泡团的建模问题,我们通过严格的数学推导,提出了一种考虑雷利-普莱塞特方程二阶导数项的新型非线性动态空化模型(NDCM)。新模型有两点改进:i)通过引入分别用于生长和塌陷过程的 $\psi_v$ 和 $\psi_c$ 的非均匀势函数,消除了经验系数;ii)只需要两个模型参数,这两个参数都基于物理量--布莱克临界半径 $R_b$ 和平均最大生长半径 $R_m。我们使用 OpenFOAM 开发了相应的空化求解器,并在其中采用了修正动量插值(MMI)方法,以确保计算结果与时间步长无关。我们采用了三个验证案例,即数值气泡簇坍塌、超声波喇叭实验和细长体周围的流体动力空化。结果表明,$\psi_v$和$\psi_c$能准确揭示空化的非线性特征,$R_b$和$R_m$能反映空化模型与实际物理量的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a Novel Nonlinear Dynamic Cavitation Model and Its Numerical Validations
Aiming at modeling the cavitation bubble cluster, we propose a novel nonlinear dynamic cavitation model (NDCM) considering the second derivative term in Rayleigh-Plesset equation through strict mathematical derivation. There are two improvements of the new model: i) the empirical coefficients are eliminated by introduction of the nonuniform potential functions of $\psi_v$ and $\psi_c$ for growth and collapse processes respectively, and ii) only two model parameters are required, which both base on physical quantities–the Blake critical radius $R_b$ and the average maximum growth radius $R_m.$ The corresponding cavitation solver was developed by using OpenFOAM in which we implemented the modified momentum interpolation (MMI) method to ensure that the calculated results are independent of time step size. Three validation cases, namely numerical bubble cluster collapse, ultrasonic horn experiment, and hydrodynamic cavitation around slender body are employed. The results indicate that $\psi_v$ and $\psi_c$ can reveal the nonlinear characteristics for cavity accurately, and $R_b$ and $R_m$ can reflect the relevance between cavitation model and actual physical quantities. Moreover, it is discussed the potentiality of NDCM that is generally applied on the cavitating flow possessing with dispersed bubbly cloud.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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