EXPERIMENTAL AND NUMERICAL INVESTIGATION OF FREE SURFACE VORTEX

An experimental model was set up to investigate the formation and evolution of the free surface vortex. A Particle Image Velocimetry (PIV) was used to measure the free surface vortex flow field at different development stages. Flow visualization was used to locate the vortex position and find its st...

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Bibliographic Details
Published in:Journal of Hydrodynamics 2008-08, Vol.20 (4), p.485-491
Main Authors: LI, Hai-feng, CHEN, Hong-xun, MA, Zheng, Yi, Zhou
Format: Article
Language:English
Subjects:
Engineering
Engineering Fluid Dynamics
free surface vortex
Hydrology/Water Resources
Numerical and Computational Physics
numerical simulation
Particle Image Velocimetry (PIV)
rankine vortex
Simulation
兰金度数
数字模拟技术
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Summary:An experimental model was set up to investigate the formation and evolution of the free surface vortex. A Particle Image Velocimetry (PIV) was used to measure the free surface vortex flow field at different development stages. Flow visualization was used to locate the vortex position and find its structure. Empirical formulas about the critical submergence and the whole field structure were obtained. It is found that the tangential velocity distribution is similar to that of the Rankine vortex and the radial velocity changes little in the vortex functional scope. Vortex starts from the free surface and gradually intensifies to air entrainment vortex. The vortex core moves during the formation and evolution of the free surface vortex. Based on the experimental model, the vortex position and structure were predicted by numerical simulation combined with a vortex model and compared with that of the experiments, which shows satisfactory agreement.
ISSN:1001-6058
1878-0342
1000-4874
DOI:10.1016/S1001-6058(08)60084-0