open TELEMAC-MASCARET The mathematically superior suite of solvers

Good afternoon,

I am meeting an issue to impose a flowrate in the boundary conditions. The computation can't run until the second iteration. I am working on the V6P1 version. Here is an extract from the used ".conlim" file:

2 2 2 0.0 0.0 0.0 0.0 2 0.0 0.0 0.0 288 721
...
2 2 2 0.0 0.0 0.0 0.0 2 0.0 0.0 0.0 809 729
4 5 5 0.0 0.0 0.0 0.0 4 0.0 0.0 0.0 353 730
...
4 5 5 0.0 0.0 0.0 0.0 4 0.0 0.0 0.0 651 860
2 2 2 0.0 0.0 0.0 0.0 2 0.0 0.0 0.0 1050 861
...
2 2 2 0.0 0.0 0.0 0.0 2 0.0 0.0 0.0 205 869

And that is what is written in the ".liq" file:

# Fichier des frontières liquides transitoires
# Généré le 24 juin 2013
T Q(1)
s m2/s
0.0 8.0E-4
2100.0 0.0192
4200.0 0.0256
6300.0 0.0192
8400.0 8.0E-4

And that is the error message appearing when I run the computation:

ITERATION 1 TEMPS : 1.0000 S
LE FICHIER DES FRONTIERES LIQUIDES CONTIENT 5 LIGNES AVEC:
Q(1)
FRONTIERE LIQUIDE : Q(1) + 8.08761905E-004
DEBIMP : PROBLEME SUR LA FRONTIERE 1
DONNER UN PROFIL DE VITESSES
DANS LE FICHIER DES CONDITIONS AUX LIMITES
OU VERIFIER LES HAUTEURS D'EAU

PLANTE : ARRET DU PROGRAMME APRES ERREUR
RETURNING EXIT CODE: 2
Duree du calcul : 5 secondes (0:0:5) (systeme=0.141 sec)



What is very surprising is that the project works for the case of an imposed velocity.
What is wrong with this case? How can I impose a flowrate?

Kind regards

Hi
You probably have no water on your boundary and then telemac is not able to compute the velocity to impose the discharge

Check the initial condition

regards

Good morning,
I am not sure that the issue comes from the initial conditions. Even if I imposed 0.001m of water on the surface, or if I imposed a water level in "COTES INITIALES" or "COTES IMPOSEES", I meet the same error message in the computation. I can input a water level and a velocity in the boundary conditions for the same project and it runs right. But this way is not faithful to the reality.