Investigation of the Effect of Edge Shape on Characteristics of Flow Under Vertical Gates

Daneshfaraz, Rasoul; Ghahramanzadeh, Ali; Ghaderi, Amir; Joudi, Ali; Abraham, John

doi:10.5942/jawwa.2016.108.0102

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…They indicated that nappe breakers placed on the trapezoidal labyrinth weirs and circular labyrinth weirs reduced the discharge coefficient by up to 4% compared to an un-amended weir. Numerical methods have been used by various researchers in recent decades [12][13][14][15][16][17]. Shaghaghian and Sharifi [18] investigated the characteristics of flow in triangular labyrinth weirs using FLUENT.…”

Section: Figure 1 -Labyrinth Weir In a Channel With Converging Wallsmentioning

confidence: 99%

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Daneshfaraz

Ghaderi

Abraham³

et al. 2021

Teknik Dergi

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In this study, the effect of channel-bed slope and non-prismatic converging channel on the discharge coefficient of labyrinth weirs is numerically investigated utilizing FLOW-3D model. Numerical simulation results show that modifying the labyrinth weir channel through both methods improves the discharge coefficient. Among the selected bed slopes and converging channel wall, the slope of β=4% and angle of θ=10° yielded the highest discharge coefficient. For a ratio H T /P=0.1, (H T : flow height, P: weir height) the discharge coefficient and discharge rate for bed slope and convergence angle case were 19.22%, 23.9% and 22.28%, 25.91% higher than for a conventional labyrinth weir in prismatic channel, respectively. Simultaneous application of a bed slope and convergence angle significantly increases the discharge coefficient and discharge value case were 28.64% and 30.42% higher than compared to the conventional case. Therefore, changing the bed slope and wall angle of the weir channel increases the discharge coefficient and in this type of weir and these design alterations should be considered in weir design.

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Section: Figure 1 -Labyrinth Weir In a Channel With Converging Wallsmentioning

confidence: 99%

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Daneshfaraz

Ghaderi

Abraham³

et al. 2021

Teknik Dergi

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“…The outflow B.C. is applied to prevent the effects of the outside conditions of the solution network [28]. Also, the Wall boundary condition was defined for walls and channel bed which act as virtual frictionless walls [29].…”

Section: Specifications Of the Airfoil-shaped Pier Model And Computatmentioning

confidence: 99%

CFD simulation of local scouring around airfoil-shaped bridge piers with and without collar

Ghaderi

Abbasi

2019

Sādhanā

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In this paper, the effectiveness of airfoil-shaped pier with and without a collar on local scour depth reduction is numerically investigated utilizing FLOW-3D model. The results show that on a constant T* = VT/D (V: velocity, T: time, D: pier width), increasing the width of the ballet of pier would result on the reduction of maximum scour depth and it would mitigate the scouring depth behind the piers. Also, because of lack of uplift vortices in using airfoil-shaped pier, there would be no scouring behind the piers. Utilizing collar on the airfoilshaped pier would result in a reduction of maximum scouring depth in front of the pier as well and the uplift vortices behind the pier would reduce. Investigation of orientation discipline of the airfoil-shaped pier on flow route shows that the pier which is reversely placed in the flow direction (the keen part in front), will cause the horseshoe vortex to weaken and make the scouring to start from downstream. However, scouring caused by horseshoe vortex in front of the airfoil-shaped pier is strongly more than scouring caused by wake vortex in the rear of the pier.

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“…If F = 0, the cell is completely full of air, and if F = 1, the cell is full of water. The free surface occurs where F = 0.5 (Daneshfaraz et al 2016a).…”

Section: Continuity Equations Momentum and Free Surfacementioning

confidence: 99%

Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD

et al. 2019

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Side weirs are utilized to regulate water surface and to control discharge and water elevation in rivers and channels. Here, the discharge coefficient for trapezoidal sharp-crested side weirs (TSCSW) and their affecting parameters are numerically investigated. To simulate the hydraulic and geometric characteristics of TSCSWs, three weir crest lengths of 15 cm, 20 cm and 30 cm with lengths of 20 cm, 30 cm and 40 cm and with two different sidewall slopes are utilized. The results show that for constant P/B (P: weir height, B: main channel width), the depth of flow along the channel and weir decreases as the crest length increases. Also, with increasing P/y 1 ratio (P: weir height, y 1 : upstream flow depth), the discharge coefficient decreases for small crest lengths and increases for large crest lengths. The results show that for constant T/L ratio (T: passing flow width, L: side weir crest length), increasing the length, height and sidewall slope of a side weir will increase the discharge coefficient. It is observed that as the upstream Froude number increases for side weirs with longer crest lengths, the intensity of deviating flow and kinetic energy over the TSCSW will increase. Finally, some relations with high correlation factors are proposed for obtaining discharge coefficients using the dimensionless parameters of P/y 1 , T/L and Fr 1 . Based on proposed relations and sensitivity analysis, it is shown that T/L and P/y 1 are the most effective parameters for reducing the discharge coefficient reduction.

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Investigation of the Effect of Edge Shape on Characteristics of Flow Under Vertical Gates

Cited by 21 publications

References 10 publications

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

CFD simulation of local scouring around airfoil-shaped bridge piers with and without collar

Investigation of trapezoidal sharp-crested side weir discharge coefficients under subcritical flow regimes using CFD

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