Large-Eddy Simulations of cavitation in a square surface cavity
| Autor: | Liping Sun, Bassam A. Younis, Shaoshi Dai |
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| Rok vydání: | 2014 |
| Předmět: |
Cavitation
Numerical and Computational Mathematics Materials science Artificial Intelligence and Image Processing Applied Mathematics Acoustics Bubble Flow (psychology) Vortex shedding Square (algebra) Vortex Physics::Fluid Dynamics LES Modeling and Simulation Physics::Space Physics Volume of fluid method Mechanical Engineering & Transports Trailing edge Multiphase |
| Zdroj: | Applied Mathematical Modelling, vol 38, iss 23 Dai, S; Younis, BA; & Sun, L. (2014). Large-Eddy Simulations of cavitation in a square surface cavity. Applied Mathematical Modelling, 38(23), 5665-5683. doi: 10.1016/j.apm.2014.04.059. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/5vp3q3zm Dai, S; Younis, BA; & Sun, L. (2014). Large-Eddy Simulations of cavitation in a square surface cavity. Applied Mathematical Modelling, 38(23), 5665-5683. doi: 10.1016/j.apm.2014.04.059. UC Office of the President: Research Grants Program Office (RGPO). Retrieved from: http://www.escholarship.org/uc/item/1cr1n403 |
| ISSN: | 0307-904X |
| Popis: | We report on the development and application of a multiphase approach to the prediction of cavitation induced by high-speed flow over and within a square surface cavity. The approach entails employing a full cavitation model in conjunction with Large-Eddy Simulations in order to capture the initiation and development of bubble formations in turbulent-flow conditions. The incipient formation of the bubble cloud, and the flow processes of vortex shedding and shear-layer oscillations are tracked using the Volume of Fluid method. The validity of the computational approach was assessed by comparisons with experiments on cavitating flow over a hydrofoil. Application to the case of flow over and within a two-dimensional square cavity with cavitation clearly reveal the presence of traveling cavitation at the corner of the cavity trailing edge, and vortex cavitation within the cavity. It is shown that the collapse of cavitation bubbles results in an impact frequency that is higher than the frequency of the shear-layer oscillations. This implies that structural damage due to cavitation is likely to be most severe at the corner formed at the intersection of the cavity's trailing edge and the flat surface upstream of it. © 2014 Elsevier Inc. All rights reserved. |
| Databáze: | OpenAIRE |
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