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HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY AT IVEN DAM
Reporter: Ayurzana.B, M Sc.School of Civil Engineering and Architecture of MUST
MUSTSchool of Civil Engineering and Architecture
EEDHydraulics, Hydraulic structures
professor team
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Research goals
Research object: Iven dam, Selenge province, Mongolia
•To determine and evaluate of flow regimes using Physical and Numerical modeling with Probably Max discharge of spillway at Iven dam•To acquire and study usage of hydraulic modeling methodology•To identify approach of improve standard designing method
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Pervious study
Hinds, 1926, Side channel spillways: Hydraulic theory and Experimental determination of losses
Yen, Venzel et all, 1970, Spatially varied flow equation in Side channel spillway
Sliskii.S, 1986, Hydraulic estimation of High-pressure hydraulic structures
Mariana Maradjieva, 2007, Hydraulic research on side-channel spillways based on physical modeling and optimization
Jerzy Machajski, 2010, Model investigations of side channel spillway of The Pilchovice dam on the Bobr river
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Pervious study
Physical model of The Pilchovice dam in Poland
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Pervious study
R.Gabl, S.Achleitner et all, 2012, Side-channel spillway – Hybrid modeling
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Research Methodology
Analytical Fluid dynamics AFDExperimental Fluid dynamics EFDComputational Fluid Dynamics CFD
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Analytical Fluid dynamics AFD
We can obtain equation of Side-channel spillway using Momentum equation /Reynolds Transport theorem/ and Energy equation
Momentum between from cross section 1 - 1 to 2 - 2
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Analytical Fluid dynamics AFD
Spatially varied flow equation SVF
Energy Principle
Decreasing dischargeIncreasing discharge
Solving method: Fr = 1 and Finite difference method
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Experimental Fluid Dynamics ЕFD
Geometry, kinematic, dynamic and mechanical similarity
Geometry similarity
Kinematic similarity
Dynamic similarity
Similarity criteria (numbers)
Otherwise
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Experimental Fluid Dynamics ЕFD
Discharge relation
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Computational Fluid Dynamics CFD
Шингэний динамикийг тооцоолон бодох арга Computational fluid dynamicВычислительная гидродинамика
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Computational Fluid Dynamics CFD
Reynolds Averaged Navier-Stokes (RANS)
Finite Volume method (FVM), Finite Element Method (FEM), Finite Difference method (FDM)
VoF (Volume of Fluid) have been given by Hoh, Woodward (1976)
K – E turbulence model
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Computational Fluid Dynamics CFD
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Standard design method- Flow regimeProbably max flow PMF - Design discharge Q5% = 131.0 m3/s
0 10 20 30 40 50 60770.00
770.50
771.00
771.50
772.00
772.50
773.00
773.50
774.00
774.50
775.00
f(x) = − 0.00139193381655364 x + 774.40944769083
Trough length , m
Ele
vatio
n, m
Water surface profile and bottom of channel (velocity increasing by linear relation)
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Standard design method- Flow regimeDesign discharge Q5% = 131.0 m3/s
0 10 20 30 40 50 60770.00
770.50
771.00
771.50
772.00
772.50
773.00
773.50
774.00
774.50
775.00
f(x) = − 0.00193703778469983 x + 774.399967143917
Trough bottom length , m
Ele
vatio
n, m
Water surface profile and bottom of channel (cross section area increasing by linear relation)
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Standard design method- Flow regimeDesign discharge Q5% = 131.0 m3/s
0 10 20 30 40 50 60 70770.00
770.50
771.00
771.50
772.00
772.50
773.00
773.50
774.00
774.50
775.00
772.69
772.12771.87 771.77 771.73
771.73
773.03
772.53772.21
771.99
771.82771.68
Length , m
Ele
vatio
n, m
Second solution
First solution
Fr Flow Cross section1.78 Supercritical 0 0.77 Subcritical 10.80 Subcritical 20.82 Subcritical 30.84 Subcritical 40.85 Subcritical 50.87 Subcritical 6
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Physical modeling
Physical model scale factor:
If prototype material is concrete which roughness is equal to n = 0.017, model roughness would be:
Model discharge:
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Physical modeling
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Physical modeling
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
CFD modeling
K-Epsilon Turbulence, Turbulent,Water and air - Segregated Flow, water temperature is not change - Segregated Fluid Isothermal, Define interaction between air and water - Volume of Fluid model
Selected model was Implicit Unsteady because Flow was Eulerian Phases, Three dimensional, unsteady flow and Dominated force is Gravity, and automatically selected Reynolds Averaged Navier-Stokes
CFD domain
Trimmer mesh
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50.400.450.500.550.600.650.700.750.800.85
X `
Crest length, trough x - axis, m
Dept
h,m
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50.40
0.50
0.60
0.70
0.80
0.90
1.00
0.91
0.70
0.54
1
Crest length, trough x - axis, m
Dep
th, m
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50.40
0.50
0.60
0.70
0.80
0.90
1.00
0.92
0.68
0.53
Crest length, trough x-axis
Def
th, m
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 50.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.40
0.50
0.69
Crest length, m
Def
th, m
Average error 0,04m
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 52.50
2.70
2.90
3.10
3.30
3.50
3.70
3.08
3.24
3.52f(x) = 2.90635495115232 x^0.118172403571405f(x) = 0.00912126310558319 x² + 0.0421723699357739 x + 3.07628697826975
X $
Crest length, m
Vel
ocit
y, m
/s
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 52.00
2.20
2.40
2.60
2.80
3.00
3.20
3.40
3.60
3.80
3.60
2.522.16
f(x) = 0.0576 x² − 1.88411095042053E-16 x + 2.16
velocity
Crest length, m
Vel
ocit
y, m
/s
Physical modeling
CFD modeling
Relative error 2,27%
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
Test №2
Test №1
Relative error 1,8% Test№2 VS Test№3
Relative error 72,3% Test VS SDMTest №3
Standard designing method
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
131m3/s
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
106.5m3/s
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
Cross section 3
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
Cross section 6
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Comparision ResultsWater surface elevation
CFD
Physical model
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Results
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Conclusion
1. As a result of the study, capacity of the side channel spillway at Iven dam should be increased.
2. Before any hydraulic structure (dam, channel, weir, and bypass construction etc) is built, the hydraulic structure should be validated using physical and CFD modeling
3. From the studies, approach results of the spillway SDM that have been effective nowadays, are defined to be not matching with physical and CFD models. This informs us to update or create a new approach to do SDM.
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Recommendation
There for to improve the accurate of standard design method, we should be assume below condition, then to study using Physical and CFD model.
-Bottom slope is not changed trough the Side-Channel-Similarity of all cross section according to geometry similarity
HYDRAULIC MODELING OF SIDE-CHANNEL SPILLWAY ON IVEN DAM
Thanks for your attention
HYDRAULICS AND HYDRAULIC ENGINEERING TEAM
Future goals
-Deeply learn HEC Package-Storm water management modeling in UB city (SWMM)-CFD modeling of special hydraulic structure and river habitat (Spillway, outlet and fish passage/ladder)