University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 50 1 2019 03 21 Numerical Simulation of Lateral Pipe Intake from Open Channel Numerical Simulation of Lateral Pipe Intake from Open Channel 135 147 70118 10.22059/ijswr.2018.252260.667851 FA Mahmood Rahmani Firozjayi Former MSc. Student, Civil Engineering Department, University of Tarbiat Modares, Tehran, Iran Ehsa Behnamtalab Assistant Professor, Civil Engineering Department, Hakim Sabzevari University, Sabzevar, Iran Seyed Aliakbar Salehi Neyshabouri Professor, Civil Engineering Department, University of Tarbiat Modares, Tehran, Iran Journal Article 2018 02 09 Intake structures which are used as water diverting structures in open channels, rivers, and reservoirs are of the oldest issues of hydraulic engineering. In this study, a lateral pipe intake was proposed as a flow diversion structure provided in side walls of a channel, and its discharge characteristics and flow pattern was studied numerically using 3D CFD package, Flow-3D. The simulations have been performed for various parameters. The results showed that the lateral pipe intake with 90^o angle has the highest efficiency among all of our simulation scenarios. The vortex and the separation zone in the lateral pipe intake were formed behind the pipe. Also, formation of the recirculation zone behind the lateral pipe intake can be affected by other parameters like inlet Froude number and transversal position of the pipe intake mouth. Furthermore, an equation was developed for the discharge coefficient in the lateral pipe intake. The computed discharges were within ±15% of the observed ones. Intake structures which are used as water diverting structures in open channels, rivers, and reservoirs are of the oldest issues of hydraulic engineering. In this study, a lateral pipe intake was proposed as a flow diversion structure provided in side walls of a channel, and its discharge characteristics and flow pattern was studied numerically using 3D CFD package, Flow-3D. The simulations have been performed for various parameters. The results showed that the lateral pipe intake with 90^o angle has the highest efficiency among all of our simulation scenarios. The vortex and the separation zone in the lateral pipe intake were formed behind the pipe. Also, formation of the recirculation zone behind the lateral pipe intake can be affected by other parameters like inlet Froude number and transversal position of the pipe intake mouth. Furthermore, an equation was developed for the discharge coefficient in the lateral pipe intake. The computed discharges were within ±15% of the observed ones. https://ijswr.ut.ac.ir/article_70118_a89a07038a60f39fa56648a5bbf2fb3e.pdf