Water Science and Engineering 2019, 12(3) 244-252 DOI:   https://doi.org/10.1016/j.wse.2019.09.001  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Air-core vortices
Analytical model
Velocity distribution
Spiral streamlines
Free surface profile   
Authors
PubMed

A 3D analytical model for vortex velocity field based on spiral streamline pattern

Maryam Azarpira, Amir Reza Zarrati *

Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran 15914, Iran

Abstract

Vortices that develop over intakes are a hazardous hydraulic phenomenon. In this study, a 3D model was developed to study the flow field in air-core vortices. This model is based on the spiral pattern of streamlines and the analytical solution of the momentum and continuity equations for deriving the three components of velocity. The model provides equations for free surface profiles and 3D patterns of the streamlines. Moreover, a new relationship was suggested for calculating effective viscosity and its distribution across the vortex flow field. The performance of the proposed analytical model was compared with existing experimental data and the results of previous analytical models. The outcomes indicated that the proposed model could predict characteristics of the vortex flow with good accuracy.

Keywords Air-core vortices   Analytical model   Velocity distribution   Spiral streamlines   Free surface profile     
Received 2018-03-09 Revised 2019-06-11 Online:  
DOI: https://doi.org/10.1016/j.wse.2019.09.001
Fund:

This work was supported by the Iran National Science Foundation (INSF, Grant No. 97008045).

Corresponding Authors: Amir Reza Zarrati
Email: Zarrati@aut.ac.ir
About author:

References:

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