التحقيق العددي لتقدير معدل الجريان خلال النواظم

Numerical Investigation to Estimate Flow Rate through Regulators

Abstract
In this study, the two cases of flow at the total opening and partial opening of the regulator gate were examined. The simulation was conducted using three-dimensional flow software, and the results were compared with the general and empirical equations for calculating the discharge through the water facilities that were get at in Labeed’s 1987 research.
The objectives of this research is to knowing the effect of gate opening and width and Froude number on volume of flow rate, studying the dimensional and nondimensional factors most affecting the discharge, calibrate the discharge from laboratory experiments with the discharge extracted from a software CFD in FLOW-3D software and extracting an equation to calculate the discharge based on the available data in the water resources departments.
Based on the modeling outcomes from calibration, it may be said that the CFD approach is a useful tool for modelling the flow pattern in regulators, the main equation was extracted, which showed good aggrement with a value of R2=0.756 and RMSE=0.004872 with MAE=0.00412 without the need for softwares, field works, or models, only the initial measurements that can be obtained from state departments and it was concluded that (H/Y) has the most effect on the flow rate by 45.8%, followed by (B/Y) with a rate of 29.4%, and finally (Fr) with a rate of 24.8%. Six models of regulators with a single opening or with multiple opening were used in laboratory water experiments. These models were calibrated by using data from Labeed 1987 by calculating the discharge based on the results of laboratory measurements.