Modeling Discharge Coefficient of Rectangular Side Orifices

Authors

1 Assoc. Prof., Dept. of Water Eng., Kermanshah Branch, Islamic Azad Univ., Kermanshah, Iran

2 Assist. Prof., Dept. of Water Eng., Kermanshah Branch, Islamic Azad Univ., Kermanshah, Iran

3 M.Sc. Graduate, Dept. of Civil Eng., Iran- Water and Wastewater Research Center, Razi Univ., Kermanshah, Iran

4 Ph.D. Student, Dept. of civil Eng., Razi Univ., Kermanshah, Iran- Water and Wastewater Research Center, Razi Univ., Kermanshah, Iran

Abstract

In this research, the discharge coefficient values of side orifices are modeled using ANFIS and the ANFIS-GA methods. To simulate the discharge coefficient, the effects of the ratio of the main channel width to the side orifice length (B/L), the ratio of the side orifice height to its length (W/L), the ratio of the flow depth in the main channel to the side orifice length (Ym/L) and the Froude number (Fr) were considered. Eleven different models were introduced for each of the ANFIS and ANFIS-GA models to estimate the discharge coefficient. Next, in order to compare the soft computing models’ results with the results of the computational fluid dynamics (CFD), the side orifice discharge coefficient was simulated using FLOW-3D model. To model the flow field turbulence, the standard k-ε and RNG k-ε turbulence models were used. According to the CFD model results, the RNG k-ε turbulence model simulated the flow field turbulence with higher accuracy as compared to k-ε model. Also, the MAPE and RMSE values for the estimated discharges by the CFD model were equal to 12.204 and 0.001, respectively. By analyzing the results of the ANFIS, ANFIS-GA and CFD models, the ANFIS-GA model was introduced as the premier model.

Keywords

References

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Water and Soil Science
Volume 29, Issue 1
April 2019
Pages 83-96

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