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Hello,

I am currently working on a dambreak, the idea being to simulate the failure including that the spillway is running during the break. Thus, the river downstream is not dry, and it passes a given flow.

I do not know how to approach the problem and impose the flow in the river, knowing that the retained water volume in the dam is taken into account in the model (same situation as in the case of Malpasset tutorial).
If anyone has an idea or similar experience is welcome.

Regards.

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Bonjour,

Je travaille actuellement sur une rupture de barrage, l'idée étant de simuler cette rupture en considérant que l'évacuateur de crues a fonctionné pendant la rupture. Ainsi, le cours d'eau en aval n'est pas sec, et un débit donné y transite.

Je ne sais pas trop comment prendre le problème et imposer ce débit dans le cours d'eau, sachant que la retenue est prise en compte dans le modèle (même situation que pour le cas tutoriel de Malpasset).
Si quelqu'un a une idée, ou une expérience similaire elle est la bienvenue.

Cordialement.

Hi
How did you plan to manage your dam in the model?
If you want to run your simulation with flow on the spillway, I suppose you include the Dam and the spillway in your mesh, so you could run the simulation before the break and obtain water in the river downstream the dam.
If you manage the dam as a sill, things are similar.
When your result reach a steady state you could consider it as an initial condition for the second simulation where you remove the dam...

In the Malpasset test case, the dam is not include in the model. We just represent it as an initial condition for the water.
If you want the same point of view, just let your simulation run without dam (prescribed discharge upstream equal to the discharge over the spillway) and when you reach a steady state, use this result as an initial condition after changing the water level upstream your dam to represent its effect.

Regards

Thank you for your answer,

I built a model where the dam is erased partially at the To (as in Malpasset tutorial).

The problem is that the spillway is a free overflow type that means there is an waterfall upstream.

I can follow your advice and work with an initial condition from a permanent state. The problem is that the dam is in the middle of the calculation domain, and I don't know how to introduce the spillway outlet in the middle of the model.

The second problem is that the spillway still work during the partial dambreak, so the Q(h) law must be respected...



Regards.

As I understand, the spillway is not on the dam itself.
So in my mind, you could manage it as a sill (and the Q(h) is OK)
2D simulation -> you neglect the waterfall
for the initial condition of the dam, you could use the element masking technique

regards