Advances in Environmental Biology, 8(17) September 2014, Pages: 1474-1479 AENSI Journals Advances in Environmental Biology ISSN-1995-0756 EISSN-1998-1066 Journal home page: http://www.aensiweb.com/AEB/ Corresponding Author: Ali Afrous, Department of Water Engineering, Andimeshk Branch, Islamic Azad University, Andimeshk, Iran. E-mail: ali.afrous@gmail.com. Flow Pattern Simulation in Intake of Ilam Reservoir Dam Using Flow3D 1 Mehrdad Safarian and 2 Ali Afrous 1 Department of Water Engineering, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran. 2 Department of Engineering, Andimeshk Branch, Islamic Azad University, Andimeshk, Iran. ARTICLE INFO ABSTRACT Article history: Received 11 June 2014 Received in revised form 21 September 2014 Accepted 25 November 2014 Available online 12 December 2014 Keyword: Illam dam, Intake, Velocity, Flow3D Characteristics and behavior of flows through river are complex phenomenon that study of it sometimes has so much cost. The study of the phenomena of the physical and mathematical models (one-dimensional, two-dimensional, and three-dimensional) and the experience of experts is used. In this study is used FLOW3D model to study the flow pattern in the rear intake of Ilam dam. This dam plays a crucial role in supplying water to downstream areas as well. The results indicate that the flow stream lines have been towards to the western intake from the beginning, so that the construction of dams and reduce the flow velocity; the sedimentation trend of the middle stream service has increased. Efficiency of the dewatering should be minimized from the intake and corrective actions to be taken to resolve existing problems. © 2014 AENSI Publisher All rights reserved. To Cite This Article: M. Safarian and A. Afrous., Flow Pattern Simulation in Intake of Ilam Reservoir Dam Using Flow3D. Adv. Environ. Biol., 8(17), 1474-1479, 2014 INTRODUCTION To understand the current situation and potential morphological study of natural variation or river engineering projects including plants, water diversion and impoundment of the river is inevitable. Yıldırım conducted investigations for the critical submergence in a rectangular intake. In the study, theoretical model setup was chosen as Rankine half body, which can be obtained by superposing line sink and uniform flow [1]. Aghamajidi et al simulated the Flow in T-Shaped Elbow Intake Station Using Flow-3D Result showed that in case of no elbow channel, turbulence energy variations from the beginning of intake`s opening until its end was increased about 60% and turbulence energy dissipation was also increased by 31% from the beginning of intake`s opening (in the river) till its end [2]. Kuroush Vahid et al discussed experimental formation of water surface profiles in a novel intake method by bottom intake with porous environment and showed that flow profile uniformity in low flow is less that uniformity in high flow. In case of low flow due to low velocity on porous surface, more flow is passed through [3]. Esmaeily modeled experimentally and numerically flow pattern of cylindrical spillway and compared it by using Fluent Software. The results of this research showed a good coordination between experimental and fluent results in flow pattern of spillway [4]. Tukur et al examined the rate of sedimentation in the conveyance canals of Kano River Irrigation Project. In this research, five canals were sampled from the total number of canals using systematic sampling technique [5]. Since Ilam dam, the main source of drinking water in Ilam and surrounding villages in this paper, three-dimensional mathematical model of FLOW-3D is used to investigate flow pattern in Ilam dam. MATERIALS AND METHODS Geographic location: Illam dam is located at a distance of 22 km south of Ilam (in Iran) downstream of the confluence of two rivers Dehbaraftab and Chavyz been constructed. Properties of the dam: Dam type: rock fills with clay core Operated elevation: 960 m above sea level Dam crest elevation: 965 m above sea level. Crown Length: 162 meters Foundation height: of 65 m