Three-dimensional numerical modeling of unconfined and confined wall-jet flow with two different turbulence models

Wall-jet flow is an important flow field in hydraulic engineering, and its applications include flow from the bottom outlet of dams and sluice gates. An in-house three-dimensional (3-D) finite-volume Reynolds-averaged-Navier-Stokes (RANS) numerical model predicts the hydrodynamic characteristics of wall jets with square and rectangular source geometry. Either the low-turbulence Reynolds number k–ω or the standard k–ε turbulence closure models are applied. The calculated results for velocity profile and bed shear stress in both longitudinal and vertical directions compare favourably with both the published experimental results and the FLUENT® finite volume model. The two closure models are compared with the k–ω model, displaying 4% greater average accuracy than the k–ε model. Finally, the influence of lateral confinement of the receiving channel on wall-jet hydrodynamics is investigated, with decreased longitudinal deceleration and decreased bed shear stress observed in a confined jet. This has important implications for sediment transport in the receiving channels downstream of sluice gates.

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Assessment of Turbulence Models for Heated Wall Jet Flow

42nd AIAA Thermophysics Conference ◽

10.2514/6.2011-3951 ◽

2011 ◽

Author(s):

Ghanshyam Singh ◽

Arvind Pattamatta ◽

Hukam Mongia

Keyword(s):

Turbulence Models ◽

Jet Flow ◽

Heated Wall ◽

Wall Jet ◽

Wall Jet Flow

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Experiments of the Three-Dimensional Wall Jet : Flow Visualization by Tuft Grid Method

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2002.3.0_265 ◽

2002 ◽

Vol 2002.3 (0) ◽

pp. 265-266

Author(s):

Haruhisa Yano ◽

Shintaro Yamashita ◽

Yoshihiro Inoue ◽

Shinya Matsui

Keyword(s):

Flow Visualization ◽

Three Dimensional ◽

Grid Method ◽

Jet Flow ◽

Wall Jet ◽

Wall Jet Flow

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Experimental Study on a Three-Dimensional Wall Jet (Flow Field in a Cross-Section of Developed Region)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.72.2940 ◽

2006 ◽

Vol 72 (724) ◽

pp. 2940-2947 ◽

Cited By ~ 1

Author(s):

Yoshihiro INOUE ◽

Haruhisa YANO ◽

Shintaro YAMASHITA

Keyword(s):

Experimental Study ◽

Flow Field ◽

Cross Section ◽

Three Dimensional ◽

Jet Flow ◽

Wall Jet ◽

Wall Jet Flow

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Wall Jet Flow Simulation in a Reservoir Using a Three-Dimensional Mathematical Model.

10.24193/awc2019_25 ◽

2019 ◽

Author(s):

Fatih ÜNEŞ ◽

◽

Mustafa DEMİRCİ ◽

Hakan VARÇİN ◽

◽

...

Keyword(s):

Mathematical Model ◽

Three Dimensional ◽

Flow Simulation ◽

Jet Flow ◽

Wall Jet ◽

Wall Jet Flow

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Three-Dimensional Numerical Investigations of the Flow Pattern and Evolution of the Horseshoe Vortex at a Circular Pier during the Development of a Scour Hole

Applied Sciences ◽

10.3390/app11156898 ◽

2021 ◽

Vol 11 (15) ◽

pp. 6898

Author(s):

Ahmed M. Helmi ◽

Ahmed H. Shehata

Keyword(s):

Shear Stress ◽

Flow Structure ◽

Three Dimensional ◽

Turbulence Models ◽

Horseshoe Vortex ◽

Bed Shear Stress ◽

Scour Hole ◽

Scouring Depth ◽

Mean Size ◽

Stress Variations

In the current study, a three-dimensional CFD model is utilized to investigate the variation of the flow structure and bed shear stress at a single cylindrical pier during scour development. The scour development is presented by seven solidified geometries of the scour hole, collected during previous experimental work at different scour stages. Different turbulence models are evaluated and the (k-ω) model is chosen due to its relative accuracy in capturing the flow oscillation and vortex shedding at the pier downstream side with personal computer computational and storage resources. The numerical results are verified against dimensionless parameters from different previous experimental works. This research describes in detail the flow structure and bed shear stress variations through seven stages of the scour hole development. The dimensionless area-averaged circulation coefficient (Ψi) is developed to evaluate the changes in the vortex strength through the scouring process by eliminating the calculation area effect. It was concluded that the circulation in the (Y) direction is the main driving factor in the development of the scour hole more than the circulation in the (X) direction. The ratio between the horseshoe vortex (HV) mean size and the scouring depth (DV/dS) in addition to the location of the maximum bed shear stress are investigated during different stages of the scour development.

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