Large eddy simulation of cavitation vortex interaction and pressure fluctuation around hydrofoil ALE 15. (1st September 2018)

• Record Type: Journal Article
• Authors: Liu, Ming; Tan, Lei; Liu, Yabin; Xu, Yun.; Cao, Shuliang
• Is Part Of: Ocean engineering. Volume 163(2018)
• Page Start: 264
• Page End: 274
• Publication Date: 2018-09-01
• Subjects: Hydrofoil ALE 15 -- Cavitating flow -- Large eddy simulation -- Vortex -- Pressure fluctuation; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2018.06.005
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Numerical investigation on cavitating flow around a three dimensional hydrofoil ALE 15 is conducted by means of large eddy simulation. The calculated values of statistical average velocities agree well with the experimental data. Evolution of cavitation shows that the vortex structure and re-entrant jet in the vicinity of hydrofoil surface result in cavitation separation and shedding. The vorticity transport equation with vortex stretching term, vortex dilatation term, and baroclinic torque term is introduced to reveal the mechanism of cavitation-vortex interaction. Analysis results show that the cavitation-vortex interaction is mainly affected by the vortex stretching term and vortex dilatation term. The calculated pressure fluctuations on the hydrofoil shortest side show a pulse shift due to cavitation oscillation. The primary frequency of shedding cavitation is 307.14 Hz, which agrees well with the experimental data of 302 Hz. Highlights: Vorticity transport equation is used to reveal the cavitation-vortex interaction. Vortex stretching term, dilatation term, baroclinic torque terms are analyzed. Cavitation-vortex interaction affected by vortex stretching and dilatation terms. Pressure fluctuations on the hydrofoil shortest side show a pulse shift.