Some notes on numerical simulation of the turbulent cavitating flow with a dynamic cubic nonlinear sub-grid scale model
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Available online at https://link.springer.com/journal/42241 http://www.jhydrodynamics.com Journal of Hydrodynamics, 2020, 32(4): 790-794 https://doi.org/10.1007/s42241-020-0041-1
Some notes on numerical simulation of the turbulent cavitating flow with a dynamic cubic nonlinear sub-grid scale model in OpenFOAM * Zi-yang Wang1, Xian-bei Huang2, Huai-yu Cheng1, Bin Ji1 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China 2. College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China (Received May 31, 2020, Revised June 8, 2020, Accepted June 9, 2020, Published online August 6, 2020) ©China Ship Scientific Research Center 2020 Abstract: The accuracy of large eddy simulation (LES) is highly dependent on the performance of sub-grid scale (SGS) model. In the present paper, a dynamic cubic nonlinear sub-grid scale model (DCNM) proposed by Huang et al. is implemented for the simulation of unsteady cavitating flow around a 3-D Clark-Y hydrofoil in OpenFOAM. Its performance in predicting the evolution of cloud cavitation is discussed in detail. The simulation with a linear model, the dynamic Smagorinsky model (DSM), is also conducted as a comparison. The results with DCNM show a better agreement with the available experimental observation. The comparison between DCNM and DSM further suggests that the DCNM is able to predict the backscatter more precisely, which is an important feature in LES. The characteristics of DCNM is analyzed to account for its advantages in the prediction of unsteady cloud cavitation as well. The results reveal that it is the nonlinear terms of DCNM that makes DCNM capture sub-grid scale vortices better and more suitable for studying the transient behaviors of cloud cavitation than DSM. Key words: Cavitation, large eddy simulation (LES), nonlinear sub-grid scale model, OpenFOAM
Cloud cavitation is a special hydraulic phenomenon, which is characterized by complex phase-change, flow separation and multi-phase vortex structures[1-3]. It is ineluctable to induce vibration, noise and even material damage, which pose a major threat to the stability and efficiency of the hydraulic machineries. Therefore, much attention have been attracted to the mechanism of unsteady cloud cavitating flow[4-5]. With the great improvement of computer technology, large eddy simulation (LES), is attracting more and more interest with notable success in simulating cloud cavitation[6]. Long et al.[7] conducted a 3-D Lagrangian technique to provide an insight into the cavitating flows around a twisted hydrofoil. Ji et al.[8] researched into the transient cloud cavitation structures and cavitation-vortex interaction systematically. Wang et al.[9] analyzed the cloud cavitation characteristics over a Clark-Y hydrofoil using adaptive mesh refinement in OpenFOAM. However, * Project supported by the National Natural Science Foundation of China (Grant Nos. 51822903, 11772239). Biography: Zi-y
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