TELEMAC-MASCARET Forum: Problem of water line before a weir (1/1)

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TOPIC: Problem of water line before a weir

Problem of water line before a weir 9 years 2 months ago #18385

arrighi

Hello,

I want to modelize in a steady state a portion of a river which contains a weir.
I impose a constante discharge upstream (Q100) and a constant water level downstream.

For the small discharge (about 0.1*Q100), the water line is ok. But for high discharge (about 0.25*Q100), the water line increase before the weir whereas the regime is subcritical (Fr<1). I attached to this post a picture of the water line.

I thought that it was a problem of stability of the model.
I have tried to modify these parameters : mesh, planimetrage, time step, but nothing works.

Does anyone know how to solve this problem ?

Thanks in advance

Claire

Attachments:

Question.png (135KB)

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Problem of water line before a weir 9 years 2 months ago #18386

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Did you make a test with the steady kernel? You wrote that Fr<1 but could you add the value on the graph? Regards
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Problem of water line before a weir 9 years 2 months ago #18387

arrighi	Yes, the result i have shown was with the steady kernel. I attached the graph of the Froude. Thanks you Claire Attachments: Froude.png (4KB)
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Problem of water line before a weir 9 years 2 months ago #18389

c.coulet OFFLINE Moderator Posts: 3722 Thank you received: 1031	Hi It could be due to the mesh size. If you refine your pesh, you will probably have a better result. Maybe you could post your model in order to check some parameters. Regards
	Christophe The administrator has disabled public write access.