The characteristics of unsteady cavitation around a NACA0015 hydrofoil with emphasis on the thermodynamic effect. (15th November 2022)

• Record Type: Journal Article
• Authors: Xu, Bin; Liu, Keyang; Deng, Yilin; Shen, Xi; Wang, Hao; Zhang, Desheng; Jiao, Yanmei
• Is Part Of: Ocean engineering. Volume 264(2022)
• Publication Date: 2022-11-15
• Subjects: Cavitating flow -- Hydrofoil -- Thermodynamic effect -- Compressibility -- Vorticity transport equation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2022.112418
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This paper aims to numerically investigate the characteristics of unsteady cavitation around a NACA0015 hydrofoil, emphasizing the thermodynamic effect. A homogeneous mixture model coupled with a filter-based density correction turbulence model and a modified Zwart cavitation model is employed to conduct the simulation. The simulation results give the unsteady process of cavitation at different shedding stages (i.e., no shedding stage, partially shedding stage, and fully shedding stage) with emphasis on the thermodynamic effect. The vorticity transport equation is employed to reveal the thermodynamic impact in detail. The importance of stretching, dilation, and baroclinic term are identified to understand the evolution mechanism of cavitating flow in fluoroketone around a NACA0015 hydrofoil with thermal effects. Besides, the "anti-thermodynamic effect" phenomenon was captured in the fully shedding stage. This research could be potentially used to understand the complex dynamic mechanism of the cavitating flow in fluoroketone with thermal effects. Highlights: The incoming fluoroketone can directly flow across the liquid-vapor interface due to the thermodynamic effect. The role of the vortex dilatation term (VDT), the vortex stretching term (VST), and the baroclinic torque term (BTT) are identified. The "anti-thermodynamic effect" phenomenon was captured in the fully shedding stage.