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

ANDRA


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)

ANDRA


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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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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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 colis

Colis primaire

Jeux résiduels

Callovo-Oxfordien

Zone endommagée

Zone fracturée


Béton de colis

Colis primaire

Jeux résiduels

Milieu Géologique (Callovo-Oxfordien)-

Zone endommagée

Zone fracturée


Béton de colis

Colis primaire

Jeux résiduels

Couplex-Gaz Test Case 1

ANDRA


Meshing strategies

0

2000

4000

6000

8000

10000

12000

14000

colenco grs intera ulg socotec cea edf

Number of elements in mesh

ANDRA


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

ANDRA


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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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)

ANDRA


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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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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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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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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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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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

ANDRA


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

couplex-gaz benchmark synthesis of results for case 1 · socotec cast3m x x fe tough2/eos5 & x...

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