Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel

There are no studies specifically aimed at characterizing and quantifying drag forces on finite cylinder arrays in the mixing layer of compound channel flows. Addressing this research gap, the current study is aimed at characterizing experimentally drag forces and drag coefficients on a square-cylin...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Rui M. L. Ferreira, Miltiadis Gymnopoulos, Panayotis Prinos, Elsa Alves, Ana M. Ricardo
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	drag coefficient square cylinder array mixing layer compound channel Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/6683ba742b3e4d9bbad8bfa862015746
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6683ba742b3e4d9bbad8bfa862015746
record_format	dspace
spelling	oai:doaj.org-article:6683ba742b3e4d9bbad8bfa8620157462021-11-25T19:15:43ZDrag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel10.3390/w132232252073-4441https://doaj.org/article/6683ba742b3e4d9bbad8bfa8620157462021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/22/3225https://doaj.org/toc/2073-4441There are no studies specifically aimed at characterizing and quantifying drag forces on finite cylinder arrays in the mixing layer of compound channel flows. Addressing this research gap, the current study is aimed at characterizing experimentally drag forces and drag coefficients on a square-cylinder array placed near the main-channel/floodplain interface, where a mixing layer develops. Testing conditions comprise two values of relative submergence of the floodplain and similar ranges of Froude and bulk Reynolds numbers. Time-averaged hydrodynamic drag forces are calculated from an integral analysis: the Reynolds-averaged integral momentum (RAIM) conservation equations are applied to a control volume to compute the drag force, with all other terms in the RAIM equations directly estimated from velocity or depth measurements. This investigation revealed that, for both tested conditions, the values of the array-averaged drag coefficient are smaller than those of cylinders in tandem or side by side. It is argued that momentum exchanges between the flow in the main channel and the flow in front of the array contributes to reduce the pressure difference on cylinders closer to the interface. The observed drag reduction does not scale with the normalized shear rate or the relative submersion. It is proposed that the value of the drag coefficient is inversely proportional to a Reynolds number based on the velocity difference between the main-channel and the array and on cylinder spacing.Rui M. L. FerreiraMiltiadis GymnopoulosPanayotis PrinosElsa AlvesAna M. RicardoMDPI AGarticledrag coefficientsquare cylinder arraymixing layercompound channelHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3225, p 3225 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	drag coefficient square cylinder array mixing layer compound channel Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	drag coefficient square cylinder array mixing layer compound channel Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Rui M. L. Ferreira Miltiadis Gymnopoulos Panayotis Prinos Elsa Alves Ana M. Ricardo Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
description	There are no studies specifically aimed at characterizing and quantifying drag forces on finite cylinder arrays in the mixing layer of compound channel flows. Addressing this research gap, the current study is aimed at characterizing experimentally drag forces and drag coefficients on a square-cylinder array placed near the main-channel/floodplain interface, where a mixing layer develops. Testing conditions comprise two values of relative submergence of the floodplain and similar ranges of Froude and bulk Reynolds numbers. Time-averaged hydrodynamic drag forces are calculated from an integral analysis: the Reynolds-averaged integral momentum (RAIM) conservation equations are applied to a control volume to compute the drag force, with all other terms in the RAIM equations directly estimated from velocity or depth measurements. This investigation revealed that, for both tested conditions, the values of the array-averaged drag coefficient are smaller than those of cylinders in tandem or side by side. It is argued that momentum exchanges between the flow in the main channel and the flow in front of the array contributes to reduce the pressure difference on cylinders closer to the interface. The observed drag reduction does not scale with the normalized shear rate or the relative submersion. It is proposed that the value of the drag coefficient is inversely proportional to a Reynolds number based on the velocity difference between the main-channel and the array and on cylinder spacing.
format	article
author	Rui M. L. Ferreira Miltiadis Gymnopoulos Panayotis Prinos Elsa Alves Ana M. Ricardo
author_facet	Rui M. L. Ferreira Miltiadis Gymnopoulos Panayotis Prinos Elsa Alves Ana M. Ricardo
author_sort	Rui M. L. Ferreira
title	Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
title_short	Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
title_full	Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
title_fullStr	Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
title_full_unstemmed	Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel
title_sort	drag on a square-cylinder array placed in the mixing layer of a compound channel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6683ba742b3e4d9bbad8bfa862015746
work_keys_str_mv	AT ruimlferreira dragonasquarecylinderarrayplacedinthemixinglayerofacompoundchannel AT miltiadisgymnopoulos dragonasquarecylinderarrayplacedinthemixinglayerofacompoundchannel AT panayotisprinos dragonasquarecylinderarrayplacedinthemixinglayerofacompoundchannel AT elsaalves dragonasquarecylinderarrayplacedinthemixinglayerofacompoundchannel AT anamricardo dragonasquarecylinderarrayplacedinthemixinglayerofacompoundchannel
_version_	1718410094210711552

Drag on a Square-Cylinder Array Placed in the Mixing Layer of a Compound Channel

Ejemplares similares