Turbulence and cavitation models for time-dependent turbulent cavitating flows |
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Authors: | Ying-Jie Wei Chien-Chou Tseng Guo-Yu Wang |
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Institution: | (1) Laboratory of Ship Hydromechanics, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;(2) LaVision GmbH, Anna-Vandenhoek-Ring 19, 37081 Goettingen, Germany |
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Abstract: | Cavitation typically occurs when the fluid pressure is lower than the vapor pressure at a local thermodynamic state, and the
flow is frequently unsteady and turbulent. To assess the state-of-the-art of computational capabilities for unsteady cavitating
flows, different cavitation and turbulence model combinations are conducted. The selected cavitation models include several
widely-used models including one based on phenomenological argument and the other utilizing interface dynamics. The k-ɛ turbulence model with additional implementation of the filter function and density correction function are considered to
reduce the eddy viscosity according to the computed turbulence length scale and local fluid density respectively. We have
also blended these alternative cavitation and turbulence treatments, to illustrate that the eddy viscosity near the closure
region can significantly influence the capture of detached cavity. From the experimental validations regarding the force analysis,
frequency, and the cavity visualization, no single model combination performs best in all aspects. Furthermore, the implications
of parameters contained in different cavitation models are investigated. The phase change process is more pronounced around
the detached cavity, which is better illus-trated by the interfacial dynamics model. Our study provides insight to aid further
modeling development. |
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Keywords: | Cavitation Turbulence model Cavitation model Hybrid model |
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