Numerical Modeling of Sharp-Crested Triangular Plan Form Weirs Using FLUENT

Shaghaghian, Mahmoud Reza; Sharifi, Mohammad Taghi

doi:10.17485/ijst/2015/v8i34/78200

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…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. The software was able to accurately simulate flow characteristics in labyrinth weirs.…”

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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“…Recently, studies have been interested in using CFD modelling as an additional design tool for labyrinth weirs (Shaghaghian & Sharifi 2015;Daneshfaraz et al 2016Daneshfaraz et al , 2019Seo et al 2016;Hu et al 2018;Sangsefidi et al 2019). A limited number of numerical researches have been achieved to date on the hydraulic characteristics of labyrinth weirs.…”

Section: Introductionmentioning

confidence: 99%

Using CFD modelling to study hydraulic flow over labyrinth weirs

2021

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Compound labyrinth weir is a new type of labyrinth weirs that consider a good applicable choice for increasing the capacity of discharge. The flow over a compound labyrinth weirs is a complex problem because the flow behavior is three-dimension. The present study aims to simulate the flow over the compound labyrinth weir into the critical regions that can not be observed when using an experimental test. The computational fluid dynamics (CFD) programme was utilised to implement a sensitive analysis for this purpose and different flow conditions. The MAPE and RMSE indices were utilised to verify the CFD results with experimental work. The statistics indices of the maximum error ME, RMSE and MAPE were 4.7%, 0.033 and 3.9 respectively. Therefore, the findings showed that there is a good matching between the experimental and CFD results. The CFD results demonstrated that the hydraulics behaviour of the compound labyrinth weir was similar to the oblique and linear weirs in high discharges. The results also confirmed that air cavities and bubbles existed behind the nappe flow in addition to the negative pressure that may occur beneath the nappe when the flow is aerated. Furthermore, the flow was divided into two parts and most streamlines were concentrated over the notches. Moreover, the flow velocity passing through the notches was bigger than the flow velocity over the high crest of the compound labyrinth weir.

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“…The results showed that for high-head conditions, the lowering of downstream bed level increases its efficiency, especially in the case of an arced labyrinth weir. Shaghaghian and Sharifi [26] investigated the characteristics of flow in triangular labyrinth weirs using commercial software FLUENT. Carrillo et al [27] numerically studied the discharge coefficient on free and submerged flows over labyrinth weirs and analyzed the free surface flow profile.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Hydraulics of Flow over Trapezoidal–Triangular Labyrinth Weirs

Ghaderi

Daneshfaraz

Dasineh

et al. 2020

Water

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In this work experimental and numerical investigations were carried out to study the influence of the geometric parameters of trapezoidal–triangular labyrinth weirs (TTLW) on the discharge coefficient, energy dissipation, and downstream flow regime, considering two different orientations in labyrinth weir position respective to the reservoir discharge channel. To simulate the free flow surface, the volume of fluid (VOF) method, and the Renormalization Group (RNG) k-ε model turbulence were adopted in the FLOW-3D software. The flow over the labyrinth weir (in both orientations) is simulated as a steady-state flow, and the discharge coefficient is validated with experimental data. The results highlighted that the numerical model shows proper coordination with experimental results and also the discharge coefficient decreases by decreasing the sidewall angle due to the collision of the falling jets for the high value of H/P (H: the hydraulic head, P: the weir height). Hydraulics of flow over TTLW has free flow conditions in low discharge and submerged flow conditions in high discharge. TTLW approximately dissipates the maximum amount of energy due to the collision of nappes in the upstream apexes and to the circulating flow in the pool generated behind the nappes; moreover, an increase in sidewall angle and weir height leads to reduced energy. The energy dissipation of TTLW is largest compared to vertical drop and has the least possible value of residual energy as flow increases.

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Numerical Modeling of Sharp-Crested Triangular Plan Form Weirs Using FLUENT

Cited by 11 publications

References 7 publications

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Effect of Different Channels on Discharge Coefficient of Labyrinth Weirs

Using CFD modelling to study hydraulic flow over labyrinth weirs

Energy Dissipation and Hydraulics of Flow over Trapezoidal–Triangular Labyrinth Weirs

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