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Water 2018, 10(3), 306; https://doi.org/10.3390/w10030306

Dip Phenomenon in High-Curved Turbulent Flows and Application of Entropy Theory

1
Dipartimento di Ingegneria Civile, Ambientale e Aerospaziale, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy
2
Research Institute for Geo-Hydrological Protection, CNR, Via Madonna Alta, 126, 06128 Perugia, Italy
*
Author to whom correspondence should be addressed.
Received: 7 February 2018 / Revised: 7 March 2018 / Accepted: 9 March 2018 / Published: 12 March 2018
(This article belongs to the Special Issue Turbulence in River and Maritime Hydraulics)
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Abstract

The estimation of velocity profile in turbulent open channels is a difficult task due to the significant effects of the secondary flow. The present paper investigates the mechanism of the velocity-dip phenomenon, whereby the location of the maximum velocity appears to be below the free surface. Previous studies conducted in straight channels relate the mechanism of the velocity-dip phenomenon to secondary flow induced by anisotropy of turbulence. This work focuses on high-curved channels where the secondary motion, which is also induced by the channel’s curvature, evolves along the bend. The width-to-depth ratio, B/h, is one of the most important parameters that are affecting the secondary motion entity. In particular, the present study aims to investigate the evolution of the velocity-dip along the bend for two values of the width-to-depth ratio and the applicability of the entropic model for the dip-phenomenon estimation. The results show that the velocity-dip is more accentuated for low values of the width-to-depth ratio, where the secondary motion plays a fundamental role in the distribution of the downstream flow velocity, although the velocity-dip is also present when the aspect ratio is higher than 10. Furthermore, the velocity profiles that were estimated by applying the entropic model are in good agreement with the measured ones, especially for B/h < 10. View Full-Text
Keywords: rivers; meanders; turbulence; secondary motion; prediction rivers; meanders; turbulence; secondary motion; prediction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Termini, D.; Moramarco, T. Dip Phenomenon in High-Curved Turbulent Flows and Application of Entropy Theory. Water 2018, 10, 306.

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