Analysis of Simulation Outputs for the Mutual Effect of Flow in Weir and Gate System

Sarhan, Sarhan Abdulsatar; Jalil, Shaker A.

doi:10.29196/jubes.v26i6.1050

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…The combined weir-gate system with milder trapezoidal side slopes of bottom opening has a highest efficiency for discharging weir flow Qw which varies between 20% to 40% as compared to the traditional one and this is accepted with (Sarhan and Jalil, 2018) [21], see Fig. (7).…”

Section: Resultsmentioning

confidence: 87%

Hydraulic Performance for Combined Weir-Gate Structure

Hussein

Jalil

2020

Tikrit j. eng. sci.

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Combined hydraulic structure play an important role in controlling flow in open channels. This study was based on experimental and numerical modeling investigations for combined hydraulic structure. For this purpose three physical models of combined sharp crested trapezoidal weir with bottom opening and one physical model of sharp crested trapezoidal weir separately were used and tested by running eight different flow rates over each model. In which three configurations of bottom opening were tested; the first configuration is a rectangular gate while other two configuration were trapezoidal with two different side slopes of (1V:4H) and (1V:2H). The water surface profiles passing through weir-gate system were measured for all thirty two runs of all models which show uniform flow at 2.11h from the upstream of weir. The commercial computational fluid dynamic software ANSYS CFX was used to simulate flow numerically. The verification of the numerical model was based on water surface profiles and discharge which showed acceptable agreement. Also, the results showed that discharge coefficient Cd varies from (0.52-0.58). Furthermore, it was shown that both models with trapezoidal gate pass a higher discharge of flow than the model with rectangular gate with average percentage increase of discharge (40.78% and 19.40%) for trapezoidal side slopes (1H:2V and 1H:4V) respectively. In addition, the combined system with milder trapezoidal side slopes of bottom opening had a better performance for discharging weir flow which is about 40% as compared with traditional one. Finally, the empirical equations for stage-discharge relationship were estimated for all models and discharge coefficients were estimated for all runs.

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Section: Resultsmentioning

confidence: 87%

Hydraulic Performance for Combined Weir-Gate Structure

Hussein

Jalil

2020

Tikrit j. eng. sci.

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“…It was observed that there is no significant correlation between the upstream Froude number and the discharge coefficient. Authors in [14] conducted a comparison between the numerical results obtained from the Flow 3D software and experimental tests to investigate the flow characteristics of a compound system comprising a vertical sharp-crested weir and gate. Authors in [15] examined the flow characteristics over a combined sharp-crowned rectangulartriangular weir.…”

Section: Introductionmentioning

confidence: 99%

Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions

Alsaydalani

2024

Eng. Technol. Appl. Sci. Res.

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Two-component composite hydraulic structures are commonly employed in irrigation systems. The first component, responsible for managing the overflow, is represented by a weir consisting of two rectangles. The second component, responsible for regulating the underflow, is represented by a semicircular gate. Both components are essential for measuring, directing, and controlling the flow. In this study, we experimentally investigated the flow through a combined two-rectangle sharp-crested weir with a semicircular gate placed across the channel as a control structure. The upper rectangle of the weir has a width of 20 cm, while the lower rectangle has varying widths (W2) of 5, 7, and 9 cm and depths (z) of 6, 9, and 11 cm. Additionally, three different values were considered for the gate diameter (d), namely 8, 12, and 15 cm. These dimensions were tested interchangeably, including a weir without a gate (d = 0), under different water head conditions. The results indicate that the discharge passing through the combined structure of the two rectangles and the gate is significantly affected by the weir and gate dimensions. After analyzing the data, empirical formulas were developed to predict the discharge coefficient (Cd) of the combined structure. It is important to note that the analysis and results presented in this study are limited to the range of data that were tested.

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“…In [13], the numerical results produced by the Flow 3D software were compared with experimental results to examine the flow of a compound system that consisted of a vertical sharp-crowned weir and gate. In [14], the flow characteristics over a combined sharp-crowned rectangular triangular weir were studied.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Jump Characteristics Downstream of a Compound Weir consisting of Two Rectangles with a below Semicircular Gate

Alsaydalani

2024

Eng. Technol. Appl. Sci. Res.

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Weirs are often used in laboratories, industries, and irrigation channels to measure discharge. The discharge capacity of a structure is vital for its safety and plays an important role in the combined gate-weir flow, which is a complicated phenomenon in hydropower. This study carried out experiments on a combined hydraulic structure, which included a compound sharp-crested weir made up of two rectangles along with an inverted semicircular sharp gate. Installed on a straight channel, this structure served as a control instrument. The study aimed to investigate the downstream hydraulic jump characteristics of this combined structure, specifically, the sequent depth ratio (y2/y1), the hydraulic jump height ratio (Hj/y1), the energy loss ratio through the jump (EL/Eu), and the jump length ratio (Lj/y1). The width of the upper rectangle on the weir was set at 20 cm. The width of the lower rectangle (W2) was set at 5, 7, and 9 cm, while its depths (z) were fixed at 6, 9, and 11 cm. The gate's diameters varied between 8, 12, and 15 cm. These measurements were alternated with varying initial Froude numbers (Fn1) ranging between 1.32 and 1.5. The results showed that the dimensions of both the weir and the gate influenced the hydraulic jump characteristics. Empirical formulas were developed to predict y2/y1, Hj/y1, EL/Eu, and Lj/y1 based on the differing dimensions of the combined structure. The findings and analysis of this study are limited to the range of data that were tested.

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Analysis of Simulation Outputs for the Mutual Effect of Flow in Weir and Gate System

Cited by 6 publications

References 15 publications

Hydraulic Performance for Combined Weir-Gate Structure

Hydraulic Performance for Combined Weir-Gate Structure

Discharge Coefficient of a Two-Rectangle Compound Weir combined with a Semicircular Gate beneath it under Various Hydraulic and Geometric Conditions

Hydraulic Jump Characteristics Downstream of a Compound Weir consisting of Two Rectangles with a below Semicircular Gate

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