Comparing shallow mixing layers over rough and smooth beds

B. Cerino; S. Proust; C. Berni; V. I. Nikora

doi:10.1201/9781003323037-5

Comparing shallow mixing layers over rough and smooth beds

B. Cerino
, S. Proust
, C. Berni
, V. I. Nikora

Engineering

INRAE

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

Abstract

Shallow Mixing Layers (SMLs) over hydraulically rough bottom in freesurface flows behind a splitter plate are studied in an 18 m long and 1.98 m wide tilted openchannel flume. Two independent inlet tanks at the entrance create two streams with different velocities. The studied shear flows over rough bed are compared to shear flows over hydraulically smooth bed, which were previously investigated in the same flume with similar ranges of flow rate and shear parameter (λ = (U₂-U₁)/(U₂-U₁) where U₂ and U₁ are streamwise time-averaged velocities characterizing the high-speed and low-speed streams, respectively. The focus is on assessing the effects of the bed-surface state (rough and smooth) on the mean flow and turbulence statistics. Initial results show a difference in transverse velocity and Reynolds stress with reduced values over a rough bed. The development of the SML width shows the same overall trend reaching a constant value downstream of the channel.

Original language	English
Title of host publication	River Flow 2022
Subtitle of host publication	Proceedings of the 11th Conference on Fluvial Hydraulics
Editors	Ana Maria Ferreira da Silva, Colin Rennie, Susan Gaskin, Jay Lacey, Bruce MacVicar
Publisher	CRC Press/Balkema
Pages	35-38
Number of pages	4
ISBN (Print)	9781032346137
DOIs	https://doi.org/10.1201/9781003323037-5
Publication status	Published - 14 Aug 2024
Event	11th International Conference on Fluvial Hydraulics, River Flow 2022 - Kingston, Canada Duration: 8 Nov 2022 → 10 Nov 2022

Conference

Conference	11th International Conference on Fluvial Hydraulics, River Flow 2022
Country/Territory	Canada
City	Kingston
Period	8/11/22 → 10/11/22

Access to Document

10.1201/9781003323037-5Licence: Unspecified

Cite this

Comparing shallow mixing layers over rough and smooth beds. / Cerino, B.; Proust, S.; Berni, C. et al.
River Flow 2022: Proceedings of the 11th Conference on Fluvial Hydraulics. ed. / Ana Maria Ferreira da Silva; Colin Rennie; Susan Gaskin; Jay Lacey; Bruce MacVicar. CRC Press/Balkema, 2024. p. 35-38.

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

Cerino, B, Proust, S, Berni, C & Nikora, VI 2024, Comparing shallow mixing layers over rough and smooth beds. in AMF da Silva, C Rennie, S Gaskin, J Lacey & B MacVicar (eds), River Flow 2022: Proceedings of the 11th Conference on Fluvial Hydraulics. CRC Press/Balkema, pp. 35-38, 11th International Conference on Fluvial Hydraulics, River Flow 2022, Kingston, Canada, 8/11/22. https://doi.org/10.1201/9781003323037-5

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title = "Comparing shallow mixing layers over rough and smooth beds",

abstract = "Shallow Mixing Layers (SMLs) over hydraulically rough bottom in freesurface flows behind a splitter plate are studied in an 18 m long and 1.98 m wide tilted openchannel flume. Two independent inlet tanks at the entrance create two streams with different velocities. The studied shear flows over rough bed are compared to shear flows over hydraulically smooth bed, which were previously investigated in the same flume with similar ranges of flow rate and shear parameter (λ = (U2-U1)/(U2-U1) where U2 and U1 are streamwise time-averaged velocities characterizing the high-speed and low-speed streams, respectively. The focus is on assessing the effects of the bed-surface state (rough and smooth) on the mean flow and turbulence statistics. Initial results show a difference in transverse velocity and Reynolds stress with reduced values over a rough bed. The development of the SML width shows the same overall trend reaching a constant value downstream of the channel.",

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AU - Berni, C.

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N2 - Shallow Mixing Layers (SMLs) over hydraulically rough bottom in freesurface flows behind a splitter plate are studied in an 18 m long and 1.98 m wide tilted openchannel flume. Two independent inlet tanks at the entrance create two streams with different velocities. The studied shear flows over rough bed are compared to shear flows over hydraulically smooth bed, which were previously investigated in the same flume with similar ranges of flow rate and shear parameter (λ = (U2-U1)/(U2-U1) where U2 and U1 are streamwise time-averaged velocities characterizing the high-speed and low-speed streams, respectively. The focus is on assessing the effects of the bed-surface state (rough and smooth) on the mean flow and turbulence statistics. Initial results show a difference in transverse velocity and Reynolds stress with reduced values over a rough bed. The development of the SML width shows the same overall trend reaching a constant value downstream of the channel.

AB - Shallow Mixing Layers (SMLs) over hydraulically rough bottom in freesurface flows behind a splitter plate are studied in an 18 m long and 1.98 m wide tilted openchannel flume. Two independent inlet tanks at the entrance create two streams with different velocities. The studied shear flows over rough bed are compared to shear flows over hydraulically smooth bed, which were previously investigated in the same flume with similar ranges of flow rate and shear parameter (λ = (U2-U1)/(U2-U1) where U2 and U1 are streamwise time-averaged velocities characterizing the high-speed and low-speed streams, respectively. The focus is on assessing the effects of the bed-surface state (rough and smooth) on the mean flow and turbulence statistics. Initial results show a difference in transverse velocity and Reynolds stress with reduced values over a rough bed. The development of the SML width shows the same overall trend reaching a constant value downstream of the channel.

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A2 - Rennie, Colin

A2 - Gaskin, Susan

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T2 - 11th International Conference on Fluvial Hydraulics, River Flow 2022

Y2 - 8 November 2022 through 10 November 2022

ER -

Comparing shallow mixing layers over rough and smooth beds

Abstract

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