Abstract
Side orifices are installed on side walls of the main channel to regulate and measure the flow. Generally, discharge coefficient is the most important hydraulic parameter of side orifices. In this study, using ANFIS and firefly algorithm, discharge coefficient of rectangular and circular side orifices was simulated. Firstly, effective parameters were defined then six ANFIS and ANFIS-FA models were introduced. Monte Carlo simulations were utilized to survey the ability of numerical models, and the k-fold cross-validation approach was used to validate numerical results. Then, a sensitivity analysis was employed to introduce the superior model. The superior model predicted discharge coefficient with reasonable accuracy. This model estimated discharge coefficient in terms of all input variables. For example, for ANFIS model, R and SI were computed 0.832 and 0.029, respectively. In addition, for the hybrid model, RMSE, MARE and SI were calculated as 0.017, 0.017 and 0.027, respectively. Additionally, the ratio of width of the main channel to the side orifice diameter (B/D) was identified as the most effective parameter.
Highlights
Side orifices are classified as divert structures installed on the main channel wall to conduct the flow into the side channel
The ratio of main channel width to side orifice diameter is detected as the most effective input parameter
In this study, using the adaptive neuro-fuzzy inference system (ANFIS) model and the firefly algorithm a hybrid algorithm was developed for estimating discharge coefficient of such hydraulic structures
Summary
Side orifices are classified as divert structures installed on the main channel wall to conduct the flow into the side channel. Such structures are broadly utilized in drainage networks, sewage disposal systems and other hydraulic goals. Due to the importance of divert structures, many experimental, analytical and numerical studies have been carried out on the hydraulic behavior of them. Hussein et al (2010) conducted an experimental study on the behavior of the passing flow through rectangular channels with circular side orifice. They provided a relationship for calculating discharge coefficient of circular sharp-edged
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