Numerical analysis of flow over side weir

Mohammed, Ahmed Y.

doi:10.1016/j.jksues.2013.03.004

Cited by 12 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(6) also showed very good agreement, as the average difference does not exceed 2.8 %. The best agreement of our measurements with the equations from other authors was found by the comparison with the study from [4], in which the side walls in the side channel were also considered, as was done in our case. Furthermore, the measured values are in good agreement with the calculated values according to the equation in [13], where the average difference does not exceed 3.7 % and the maximum difference 8 %.…”

Section: Verification Using Other Experimental Data For Sharp-crestedsupporting

confidence: 81%

“…Several equations have been proposed for the calculation of the coefficient C d for the sharp-crested side weir and for the broad-crested weir. Most of the authors have considered the impact of the inflow Froude number in their equation [2] and [3], some have also considered the impact of the overflow height [4] and [5], but only a few have taken into account the impact of the length of the side weir. The impact of the width of a broadcrested side weir has also been investigated [6] and [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the Operating and Geometric Characteristics of a Bottom-hinged Flap Gate on the Discharge Coefficient of a Side Weir

Müller¹,

Novak²,

Steinman

et al. 2015

SV-JME

View full text Add to dashboard Cite

Bottom-hinged flap gates on side weirs are often used for the regulation of flow diversion in case of water abstraction for a variety of needs. In this study, a new equation for the discharge coefficient of a bottom-hinged flap gate on a side weir was proposed on the basis of discharge measurements. The equation was divided into two parts. The first part covers the impact of the sharp-crested side weir and the second the influence of the position and the width of the flap gate. In this manner, the discharge coefficient can be calculated with other authors' equations for a sharp-crested side weir, which then must be multiplied by the new proposed coefficient. Very good agreement was found between the obtained discharge coefficients and the one calculated with the proposed equation. Furthermore, the results were compared with the equations of other authors for the discharge coefficients of sharp-and broad crested side weirs. The agreement was found to be very good. Additionally, measurements of water levels along the edge of the flap gate and measurements of the velocity field were carried out with a computer-aided visualization method. From these measurements, it was possible to show that the contraction of the water jet varies with the gate-opening angle. It was also found that the side weir with a flap gate has the most favorable hydrodynamic shape around the gate-opening angle of 33°, where the discharge coefficient reaches its maximum.

show abstract

Section: Verification Using Other Experimental Data For Sharp-crestedsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Influence of the Operating and Geometric Characteristics of a Bottom-hinged Flap Gate on the Discharge Coefficient of a Side Weir

Müller¹,

Novak²,

Steinman

et al. 2015

SV-JME

View full text Add to dashboard Cite

show abstract

“…Ali et al (2018) Borghei et al (2003) Singh et al(1994) − 89.1471 − 85.9892 0.149129 0.171664 0.065501 0.19969 Jalili and Borghei (1996) − 63.6206 − 60.4627 0.248475 0.318192 0.147583 0.332717 Borghei et al (1999) − 63.9808 − 60.8228 0.237019 0.310161 0.816017 0.317376 Ali et al (2018) − 60.5438 − 61.7628 0.256712 0.356521 0.713012 0.319743 Borghei et al(2003) − 69.9232 − 69.8343 0.275439 0.363231 0.816562 0.335476 -5% +5% Table 4 represent statistics comparison for the present work with previous studies, and it may be seen that the GEP model refers to highest value of R 2 (0.994) and the lowest value of MARE and RMSE (0.00523 and 0.00465), respectively, as well as the AIC refers to the best value (− 216.51) compared with all others equations, and all that indicate that the execution of GEP is the best with respect to other previous equations; overall, all values refer to a good agreement of equation for the present work compared with MLR according to Ahmed (2015) and all other previous equations. Figure 5 shows a comparison between the discharge coefficients estimated using MLR models and GEP models, respectively, while Figs.…”

Section: Resultsmentioning

confidence: 53%

“…examined using (Statistical Package Social Sciences SPSS user guide). According to Ahmed (2015), from Eq. 7 using several models of SPSS, Eq.…”

Section: Modeling Of Skew Side Weir Using Mlrmentioning

confidence: 99%

“…Honar and Javan (2007) and Amir et al (2016). The numerical analysis on inclined side weir was investigated by Ahmed (2011), Ahmed et al (2013) and Ahmed (2015). A powerful tool is recently used to solve complex nonlinear and multi-linear regression equations in hydraulic engineering such as artificial neural network (ANN), genetic programming (GP) and statistic's analysis using Monte Carlo method, Kisi et al (2012), Ahmed (2018), Hayawi et al (2019) and Ahmed and Anna (2020).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gene Expression Programming (GEP) to predict coefficient of discharge for oblique side weir

Mohammed

Sharifi

2020

Appl Water Sci

Self Cite

View full text Add to dashboard Cite

In irrigation and drainage structures, side weir is widely used for flow diversion from main to branch channels. Side weir is also used as a measuring device for discharge measurements, so discharge coefficient was mainly studied in many previous studies. Skew side weir was not taking a good highlight in previous studies and literature, so the present work discharge coefficient calculation for the skew side weir was adopted and studied. Multiple Linear Regression (MLR) and Gene Expression Programming (GEP) tools were used in the present study and compared with observed values of C d. The mean absolute error for C d observed and calculated in MLR and GEP was not exceeded 5%. The C d values for skew side weir ranged from (0.65) to (0.85), while its values for straight vertical side from previous literature weir ranged from (0.45) to (0.65); this mean skew side weir can be used for increase in discharge diversion to the branch channel at the same water levels by 27%. The Akaike information criteria (AIC) with (AICs), root-mean-square error (RMSE), mean absolute relative error (MARE) and scatter index (SI) are used in this study for measuring the GEP model performance. From results, the GEP model has AIC = − 216.51, AICs = − 918.51, RMSE = 0.004653, MARE = 0.005234, R 2 = 0.994 and SI = 0.006231 performed the best. According to previous results, the new equation presented through GEP can be adopted for discharge coefficient calculation in skew side weir.

show abstract