Contents & References of Numerical analysis of the flow near the aeration ramp of the tunnel overflow
List:
1 Introduction 3
1-1 Introduction 3
1-2 Statement of the problem 4
1-3 Necessity of conducting the research 4
1-4 The purpose of the research 5
1-5 Thesis structure 5
2 Technical literature and subject background 7
2-1 Introduction 7
2-2 Cavitation in overflows 10
2-3-1 Effects of cavitation 10
2-3-2 The mechanism of destruction caused by cavitation 11
2-4 Step overflows 13 2-4-3 Aeration 13 2-5 Flow aeration 14 2-5-1 General classification of flow aeration 15 2-5-2 Effects of flow aeration in weirs 18 2-6 Researches related to aeration 19
3 Materials and methods 40
3-1 Introduction 40
3-2 Equations governing the flow 40
3-3 Preparation of numerical model 42
3-3-1 Model and laboratory conditions 42
3-3-2 Introduction of Fluent software 45
3-3-3 Geometry and numerical model meshing 51 3-3-4 Boundary conditions and initial conditions 54 3-3-5 Software settings 55 3-3-6 Sensitivity analysis 56 4 Results of numerical flow analysis - without aeration 59 4-1 Introduction 59
4-2 Validation of the results of the numerical model 59
4-2-1 Reconnection length 59
4-2-2
4-3-1 The effect of increasing the height and angle of the ramp on the reconnection length 66
4-3-2 The effect of increasing the height and angle of the ramp on CP min 68
4-3-3 The effect of increasing the height and angle of the ramp on the intensity of turbulence 69
4-4 The flow velocity profiles passing over the ramp 70
4-5 Pressure distribution 72
5 Results of numerical analysis of flow - with aeration 77
5-1 Introduction 77
5-2 Velocity profiles 83 5-3 The effect of the geometric dimensions of the ramp on the flow parameters 86 5-3-1 The effect of increasing the height and angle of the ramp on the cavity length 86 5-3-2 The effect of increasing the height and angle of the ramp on CP min 87 5-3-3 The effect of increasing the height and angle of the ramp on the intensity of turbulence 88 5-4 Effect of aeration on flow characteristics 90 5-4-1 Cavity length 90 5-4-2 Minimum pressure coefficient CP min 93 5-4-3 Turbulence intensity 95 5-4-4 Velocity profiles 96 5-4-5 Profiles Pressure 100
5-5 The efficiency of two-dimensional and three-dimensional numerical models in simulating the flow passing over the ramp
Source:
Arami Fadafen, M; Alvi Moghadam, M.; Azhdari Moghadam, M.; Akbari, Gha: (2017), "Evaluation of the effect of aeration in reducing cavitation by three-dimensional flow modeling". The 11th National Seminar on Irrigation and Evaporation Reduction, Shahid Bahonar University of Kerman.
Asfi, M; Ziaei, A., N: (2017), "2D numerical simulation of hydraulic jump on inverse inclined surfaces with a step at the end with FLUENT software". 6th National Congress of Civil Engineering, Semnan University.
Azhdari Moghadam, M; Arami Fadafan, M.: (2016), "Investigation of changes in the air concentration of the flow passing through the aerator
Azhdari Moghadam, M; Arami Fadafen, M.: (2012), "Investigation of changes in the air concentration of the flow passing through the aerator using the CFD method". 9th International Congress of Civil Engineering, Isfahan University of Technology.
Azhdari Moghadam, M.; Akbari, G; Alvi Moghadam, M.; Arami Fadafan, M.: (2016), "Investigating the cavitation occurrence on the spillway shot and the need to use aerators (case study: Karun Dam 1)". 10th Iranian Hydraulics Conference, Gilan University.
Bahrami, A; Barani, Gha: (2008), "Numerical study of air concentration changes in currents passing through the shot". 8th International Congress of Civil Engineering, Shiraz University.
Bahrami, A; Barani, Gha: (2007), "Investigation of effective factors in aeration and the role of aerators in preventing cavitation in overflows". The 3rd Iran Water Resources Management Conference, Tabriz University.
Birami, M. K: (2007), "Water transfer structures". Publications of Isfahan University of Technology, 7th edition.
Joan, M.; Hamzaei, M.; Iqbalzadeh, A: (2009), "Numerical simulation of free water surface profile on wide edge spillways". The first national conference of applied research on water resources of Iran, Kermanshah.
Hassanzadeh, R; Kamali, N., J.: (2019), Flow modeling on barrier breakwaters using FLUENT numerical model. The 11th National Seminar on Irrigation and Evaporation Reduction, Shahid Bahonar University of Kerman.
Khosroujerdi, A. and pious, Z. (2016), "Investigation of the effect of aeration ramp dimensions on cavitation in the spillway of Siazakh and Gavshan dams", 11th Iran Hydraulic Conference.
Khosroujeri, A; Shahmohammadi Mehrjardi, M: (2006), "Hydraulic investigation of a peak overflow with an axial arch". 9th National Seminar on Irrigation and Evaporation Reduction, Kerman.
Dehghani Sanich, M. A. (2017), "Numerical simulation with Fluent 6.3 software", third edition, Naqos Publications.
Rostami, M.; Alas, M; Mesbahi, J.; Talkhablo, M.: (2016), "Evaluation of energy loss and flow pattern on stepped spillway using Fluent software". The 6th Iranian Hydraulic Conference, Shahrekord University.
Rohani Guchani, M; Salehi Neishabouri, A, A; Hosseini, A: (2008), "A three-dimensional numerical study of the effect of roughness on the formation of cavitation in the spillway of Shahid Abbaspur Dam". 9th Iranian Hydraulic Conference, Tarbiat Modares University.
Zandy, Y: (2015), "Cavitation in spillways". Publications of Islamic Azad University of Tabriz, 1st edition.
Sultani, M; Rahimi Assal, R: (2012), "Computational fluid dynamics with the help of FLUENT software". Design publication.
Syed Ashraf, A; Akhtari, A, A: (2017), "3D Numerical Modeling of Flow in Oblique Lateral Overflows and in Non-Prismatic Rectangular Channels". The 6th National Congress of Civil Engineering, Semnan University.
Shamsaei, A; Khosronjad; A: (2008), "Numerical analysis of cavitation phenomenon in dam overflow". International Conference on Hydraulic Structures, Shahid Bahonar University, Kerman. Shamsaei, A: (2014), "Design and Construction of Reservoir Dams: Concrete Dams". (3rd volume), Iran University of Science and Technology.
Shamsai, A; Mohammadi, A. (2007), "Study of the effect of step geometry on energy loss in stepped spillways by numerical simulation". The 3rd Iran Water Resources Management Conference, Tabriz University.
Abdi, H; Khajovand Khazaei, S: (2016), "3D numerical modeling of free peak overflow in order to investigate the occurrence of cavitation phenomenon (with a case study)". The first international conference and the third national conference on dams and hydroelectric power plants, Tehran.
Attarzadeh, A; Zarati, A., R.; Shanehsazzadeh, A: (2016), "Flow conditions at the place of sudden slope change of overflows". Scientific Research Journal of Imran Modares, twelfth volume, number 1. Kavianpour, M. , Toloui, A. and Maksoumi, A. (2008), "Evaluation of pressure fluctuations downstream of aerators in the lower tunnels of dams with circular sections", National Conference of Hydroelectric Power Plants of the country. Kavianpour, M; Hosseini, M.: (2009), "Numerical investigation of two-phase flow characteristics on stepped spillways (case study: Siah Bisheh dam spillway)". 5th National Congress of Civil Engineering, Ferdowsi University of Mashhad.
Kavianpur, M. Haji Kennedy, H. Pirouz, B: (2007), "Numerical solution of the aeration flow downstream of the aerators in the lower dischargers of Sefid Rood Dam". 3rd Iran Water Management Conference, Tabriz University.
Mohbi, M. and Kavianpour, M. (2017), "Numerical investigation of static pressure changes during stepped spillways using Fluent software", 11th Iranian Hydraulic Conference, November 2018, Urmia University.