Numerical simulations of propeller cavitation flows based on OpenFOAM
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Numerical simulations of propeller cavitation flows based on OpenFOAM * Min-sheng Zhao, Wei-wen Zhao, De-cheng Wan Computational Marine Hydrodynamics Lab (CMHL), State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China (Received October 9, 2020, Revised October 22, 2020, Accepted October 23, 2020, Published online November 26, 2020) ©China Ship Scientific Research Center 2020 Abstract: In order to study the cavitation and hydrodynamic characteristics of propeller under uniform and non-uniform flows, numerical investigations are performed using interPhaseChangeDyMFoam in the open source computational fluid dynamics (CFD) software platform OpenFOAM with Schnerr-Sauer cavitation model. The simulation results can be used as a reference to evaluate the working ability of a propeller in case of actual navigation. A new grid encryption method is adopted in the research to better capture the existence of vortex cavitation at the propeller tip. The method of function input is carried out in the study to simulate the condition of non-uniform flow and reduce the calculation amount. Typical unsteady dynamics are predicted by the Reynolds-averaged Navier-Stokes (RANS) method with a modified shear stress transport (SST) k - turbulence model. The numerical results of the propeller such as cavitation shape and pressure distribution under uniform and non-uniform flow are analyzed and compared with each other. Key words: OpenFOAM, E779A propeller, cavitation, non uniform flow
Introduction The study of cavitation plays an important role in today’s hydrodynamics research. Such phenomenon contains many complex flows known in hydrodynamics, including turbulence, two-phase flow and so on. Up to now, there are still some limitations in people's understanding about the formation mechanism of cavitation and the dynamics involved in the shedding of the cavitation period. With the development of industry, hydrodynamic equipment always operates at high speed condition, which makes it difficult to avoid cavitation, and the vibration and noise caused by the phenomenon affect the hydrodynamic performance of equipment. Therefore, the research on the unsteady characteristics of cavitation has always been a hot topic of fluid mechanics. * Project supported by the National Natural Science Foundation of China (Grant Nos. 51879159, 51809169 and 51909160), the National Key Research and Development Program of China (Grant Nos. 2019YFB1704200, 2019YFC0312400), the Chang Jiang Scholars Program (Grant No. T2014099) and the Innovative Special Project of Numerical Tank of Ministry of Industry and Information Technology of China (Grant No. 2016-23/09). Biography: Min-sheng Zhao (1994-), Male, Ph. D. Candidate, E-mail: [email protected] Corresponding author: De-cheng Wan, E-mail: [email protected]
Researchers have done a lot of experiments on cavitation in the laboratory, these data and observed phenomena are of great help to study the mechanism and c
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