Abstract
The Reynolds-averaged Navier-Stokes (RANS), such as the original k-ω two-equation closures, have been very popular in providing good prediction for a wide variety of flows with presently available computational resource. But for cavitating flows, the above equations noticeably over-predict turbulent production and hence effective viscosity. In this paper, the detached eddy simulation (DES) method for time-dependent turbulent cavitating flows is investigated. To assess the state-of-the-art of computational capabilities, different turbulence models including the widely used RANS model and DES model are conducted. Firstly, in order to investigate the grid dependency in computations, different grid sizes are adopted in the computation. Furthermore, the credibility of DES model is supported by the unsteady cavitating flows over a 2D hydrofoil. The results show that the DES model can effectively reduce the eddy viscosities. From the experimental validations regarding the force analysis, frequency and the unsteady cavity visualizations, more favorable agreement with experimental visualizations and measurements are obtained by DES model. DES model is better able to capture unsteady phenomena including cavity length and the resulting hydrodynamic characteristics, reproduces the time-averaged velocity quantitatively around the hydrofoil, and yields more acceptable and unsteady dynamics features. The DES model has shown to be effective in improving the overall predictive capability of unsteady cavitating flows.
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This project is supported by National Natural Science Foundation of China (Grant No.11172040)
HUANG Biao, born in 1985, is currently a PhD candidate at Beijing Institute of Technology, China. His research interests include the numerical simulation of multiphase cavitating flows.
WANG Guoyu, born in 1961, is currently a professor at Beijing Institute of Technology, China. He received his PhD degree from Tohoku University, Japan, in 1999. His research interests include the fluid machinery and engineering and the mechanism of cavitation and supercavitation flow.
YU Zhiyi, born in 1975, is currently an associate professor at Beijing Institute of Technology, China. He received his PhD degree from Tsinghua University, China, in 2005. His research interests include numerical simulation of multiphase flows.
SHI Shuguo, born in 1983, is currently a PhD candidate at Beijing Institute of Technology, China. Her research interests include the numerical simulation of multiphase cavitating flows.
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Huang, B., Wang, G., Yu, Z. et al. Detached-eddy simulation for time-dependent turbulent cavitating flows. Chin. J. Mech. Eng. 25, 484–490 (2012). https://doi.org/10.3901/CJME.2012.03.484
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DOI: https://doi.org/10.3901/CJME.2012.03.484