Numerical Modeling of Flow and Aeration System of the AZAD Dam’s Spillway Using ANSYS FLUENT Model

Subject Areas : Article frome a thesis

Mahya Mehdiabadi ¹ , Ali Arman ²

1 - Campus of Agriculture and Natural Resource.,Razi University , Kermsanshah, Iran
2 - Campus of Agriculture and Natural Resource.,Razi University , Kermsanshah, Iran

Received: 2019-05-05 Accepted : 2021-04-26 Published : 2021-04-21

Keywords: cavitation, Aeration system, Ogee spillway, Azad dam, ANSYS FLUENT model,

Abstract :

Introduction: Cavitation is one of the most important problems that may occur due to high flow velocity in dam spillways. In order to predict of dam spillway structure during operation, Azad dam spillway hydraulic model has been modeled in Tehran Water Research Institute. Materials and Methods:In this study, using computational fluid dynamics in the form of a finite volume method used in ANSYS FLUENT software, flow modeling in these channels, and a fluid volume model (VOF) in a three-dimensional state, including two-phase flow of water and air, used for Considering current turbulence, k-ε model has been used. In order to confirm the results of the model, a comparison was made with the results of a hydraulic model implemented without the aero-damping system of Azad spillway. Findings:Then, in order to confirm the location and number of aeration systems, two scenarios (two and three aeration systems) including step ramp (RAMP) on the floor and the wall of the duct with a suitable slope and the installation of the aeration slot in the wall have been used, which sends air near the floor And the walls will be. Conclusion:Then, by checking flow parameters such as speed, pressure and cavitation index, overflow with two aeration systems was confirmed as the best option.

References:

1. دهدار بهبهانی، ص.،(1390)، بررسی هیدرولیک جریان سرریز بالارود با استفاده از مدل ریاضی FLOW 3D و مقایسه با مدل فیزیکی، پایان نامه کارشناسی ارشد، دانشگاه شهید چمران اهواز، اهواز، ایران.

(https://scu.ac.ir/~fathi49)

1. آرامی فدافن م. علوی مقدم م. اژدری مقدم م. اکبری غ. 1390. بررسی تاثیر هوادهی در کاهش کاویتاسیون به وسیله مدل‌سازی سه‌بعدی جریان، یازدهمین سمینار سراسری آبیاری و کاهش تبخیر. کرمان.

(https://civilica.com/doc/157883/)

ورجاوند،پ.فرسادی‌زاده،د.حسین‌زاده‌دلیر،ع.صدرالدینی،ع.1388،"شبیه‌سازی سه بعدی جریان در سرریز جانبی با استفاده از مدل آشفتگی k –ε و مقایسه نتایج با مدل فیزیکی "، مجله دانش آب و خاک،جلد1/20، شماره3 ، دانشگاه تبریز.

(https://www.sid.ir/fa/journal/ViewPaper.aspx?id=141150)

1. ایزدی‌نیا،ا.ریسمانی،ن.میرعلایی، ر.1395،"شبیه‌سازی تاثیر تغییرات جریان بر پدیده کاویتاسیون روی یک سرریز اوجی با استفاده از نرم‌افزار فلوئنت"، نهمین کنگره ملّی مهندسی عمران، دانشگاه فردوسی مشهد.

(http://www.tpbin.com/article/49534)

1. Ozturk M. and Aydin M. c. 2009. Verification of a 3-D numerical model for spillway aerator. Mathematical and Compotational Applications. 14(1): 21-30.

     (https://doi.org/10.3390/mca14010021)

1. Bordbar A. Mousavi-jahromi H. Shafaei Bajestan M. and Sedghi H. 2010. Step effects investigation on the flow regime and cavitation in stepped morning gloye spillways. World Applied Sciences journal. 10(9): 1024-1031.

 (https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.390.3838&rep=rep1&type=pdf)

1. Li CH, gong J,li X, (2011). Numerical simulation of flow over a spillway with turbulence model. Mechanics and Materials volume 90-93 on pages 2511 to 2515.

 (https://doi.org/10.4028/www.scientific.net/AMM.90-93.2511)

1. Yurdagul Kumcu,S,(2016),Investigation of Flow Over Spillway Modeling and Comparison between Experimental Data and CFD Analysis. KSCE Journal of Civil Engineering (2017) 21(3):994-1003. Necmettin Erbakan University, Konya, Turkey.

    (https://doi.org/10.1007/s12205-016-1257-z(`