couplex-gaz benchmark synthesis of results for case 1 · socotec cast3m x x fe tough2/eos5 & x...
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Couplex-Gaz Benchmark
Synthesis of results for case 1
Jean TalandierAndra
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
The results from this presentation have been obtained by the groups below
• CEA (F. Caro)
• Colenco (A. Pollers, J. Croisé)
• ECN/Université de Toulon (M. Saad, C. Galusinsky)
• EDF (S. Granet, C. Chavant)
• GRS (V. Javeri)
• Intera (R. Senger)
• Socotec (L.-V. Benet)
• Université de Liège (R. Charlier, F. Collin, P. Gerard, J.P. Radu)
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
FVE MPFAxxCast3MCEA
FExxLagamineULG
FExxCast3MSOCOTEC
IFDxxTough2/eos5 & Tmvoc
INTERA
IFDxTough2/eos7GRS*
FExxCode_AsterEDF
IFDxxTough2_MP/eos5COLENCO
Discretisation methodsCas 1bCas 1aCodeGroup
* Results on Case 2
Groups and codes
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Some of the Couplex-Gaz objectives
Increase the confidence into the numerical tools used to evaluate some critical parameters: the maximum gas pressure in the repository, the saturation around
the canisters and water flux induce by gas
Where are the numerical difficulties for two phase flow problem
Identification of the most interesting methods to solve non linear equations associated to the gas migration in porous media
Propose to the scientific community a concrete test case representative of some specific constraints of our studies
Identification of teams for the next campaigns of simulation
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
High contrast in properties
• Permeability
• Porosity
• Gas Entry pressure
• Retention and relative permeability curves
Callovo-Oxfordien
Zone endommagée
Zone fracturée
Béton de remplissage
Béton de colis
Colis primaire
Jeux résiduels
Milieu Géologique (Callovo-Oxfordien)-
Zone endommagée
Zone fracturée
Béton de remplissage
Béton de colis
Colis primaire
Jeux résiduels
Callovo-Oxfordien
Zone endommagée
Zone fracturée
Béton de remplissage
Béton de colis
Colis primaire
Jeux résiduels
Milieu Géologique (Callovo-Oxfordien)-
Zone endommagée
Zone fracturée
Béton de remplissage
Béton de colis
Colis primaire
Jeux résiduels
Couplex-Gaz Test Case 1
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Meshing strategies
0
2000
4000
6000
8000
10000
12000
14000
colenco grs intera ulg socotec cea edf
Number of elements in mesh
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Case 1a
The idea was to introduce a simplification in the physical model to build an easier case
Finally, the case seems really more difficult to solve compare to case 1b
7,24ULG8,28Socotec7,75EDF
7Colenco7,85CEA
Pmax (MPa)
The Maximum gas pressure is obtained at 10 000 years
0
1
2
3
4
5
6
7
8
9
0 5000 10000 15000 20000
Time (year)
Gas
pre
ssur
e (M
Pa)
ulg
edf
socotec
Colenco
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Case 1a
0
0,05
0,1
0,15
0,2
0,25
0,3
0,35
0,4
0 20000 40000 60000 80000 100000
Time (year)
Wat
er s
atur
atio
n
edf
socotec
Colenco
Water saturation in the waste package
Very slow resaturation of the cell
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Case 1bCase 1a + Dissolution of hydrogen, gas migration in the liquid phase
0
1
2
3
4
5
6
7
8
9
1 10 100 1000 10000 100000
Time (year)
Gas
pre
ssu
re (
MP
a) ULGEDFGRSSocotecCEAcolenco
First period of gas injection End of gas injection phase
Gas pressure in the waste package
0
20
40
60
80
100
120
0 5000 10000 15000
Temps (an)
pro
du
ctio
n H
2 (m
ol/a
n)
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
6.95.5ULG75.6Socotec
6.75.2GRS7.26.5EDF6.25.2Colenco8.16.2CEA
Gas Pressure at 10000 years
Gas Pressure at 500 years
Case 1bMaximum gas pressure
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
0 20000 40000 60000 80000 100000
Time (year)
Wat
er s
atur
atio
n
ULGEDFGRSsocoteccolenco
Water saturation in the waste
0.364.67ULG0.354.64Socotec0.584.65GRS0.24.88EDF0.715.31ColencoSwPg
The difference is larger on Water Saturation than on Gas Pressure
Gas pressure and water saturation in the waste at 50 000 years
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
0
1
2
3
4
5
6
7
8
9
1 10 100 1000 10000 100000
Time (Year)
Gas
Pre
ssu
re (
MP
a)
ULG
EDF
GRS
Socotec
CEA
Colenco
Gas pressure in Cox0,990
0,992
0,994
0,996
0,998
1,000
1 10 100 1000 10000 100000
Time (year)
Wat
er s
atur
atio
n
ULG
EDF
GRS
Socotec
Colenco
Water saturation in Cox
Case 1b
The water saturation is upper than 99%
in the undisturbed clay
1,0E-01
1,0E+00
1,0E+01
1,0E+02
0,4 0,5 0,6 0,7 0,8 0,9 1
Water Saturation
Cap
illar
y pr
essu
re (M
Pa)
Part of the curve used
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
0,70
0,75
0,80
0,85
0,90
0 100 200 300 400 500 600 700 800 900 1000
Time (year)
Wat
er s
atu
ratio
n
ULG
EDF
GRS
Colenco
Equilibration phase 0à ~300 years
Water saturation in concrete Initial conditions Pw and Sw
-8
-6
-4
-2
0
2
4
6
8
50 55 60 65 70 75 80
z (m)
Pw
(M
Pa)
0,00
0,10
0,20
0,30
0,40
0,50
0,60
0,70
0,80
0,90
1,00
50 55 60 65 70 75 80
Z (m)
Wat
er s
atur
atio
n
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
0 20 40 60 80 100 120
z (m)
Pw
(MP
a)
EDF
ULG
Socotec
Water pressure at 250 years
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Time of total resaturation
90 000 (extrapolation)Intera
181 00052 000CEA
90 00089 000ULG87 00086 000Socotec
70 00066 000GRS> 500 000EDF
60 000 (extrapolation)Colenco
Time for Sw=99.8%Time for Sw=99%
Gas pressure increase very low (linear approach) :
Ø 0.01 MPa/year for t =0 à 500 years
Ø 0.0002 MPa/year for t=500 à10 000 years
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
0
2000
4000
6000
8000
10000
12000
14000
d'éléments
1 2 3 4 5 6 7
0
10
20
30
40
50
60
70
1 2 3 4 5 6 7
Duration of a run (hours)
Number of elements in the mesh
•The total time of simulation is not the same for each result (50000 à1 million years)
0
100000
200000
300000
400000
500000
600000
700000
800000
900000
1000000
1 2 3 4 5 6 7
• The computers are not identical
• Some difficulties in convergence at the beginning of the run (equilibration phase)
and at the end when all the domain is almost saturated
• One group used parallelise tool
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
Conclusion
• Good level of mobilization for the first part of the benchmark (about 10 teams involved)
• Very interesting results and a good agreement between the results from different teams
•The complete physical model was generally easier to run than the simplified one
• The main difficulties of the test seems to be at the beginning (equilibration phase) and the total resaturation phase
• At the end of the first stage, 7 teams will receive the subvention CEA, Colenco, EDF, ULG, GRS, Intera, Socotec
• Thanks to Ø The scientific committeeØ All the teams who contribute to the benchmarkØ Véronique Ensergueix, for the help in organisation of the workshop
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© ANDRA – Direction Scientifique Workshop Couplex-Gaz 4 avril 2007
0,990
0,992
0,994
0,996
0,998
1,000
1 10 100 1000 10000 100000
Time (year)
Wat
er s
atur
atio
n
ULG
GRS
Socotec
Colenco
EDF
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
0 20000 40000 60000 80000 100000
Time (year)
Wat
er s
atur
atio
n
ULGGRSsocoteccolencoEDF
Additional results from EDF
Results from EDF with initial gas pressure equal to 1 atm in the saturated zone (Instead of 5 MPa in the previous run)
Water saturation in Cox Water saturation in the waste
Maximum gas pressure = 6.65 MPa at 10 000 years