TELEMAC-MASCARET Forum: Velocity at the tube nodes (1/1)

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TOPIC: Velocity at the tube nodes

Velocity at the tube nodes 9 years 8 months ago #16234

DanieleD90 OFFLINE Junior Boarder Posts: 55 Thank you received: 3	Good morning everyone, I have a question for you. I used tube data file in my simulation. In tube data file I selected as the first node the one you can see in the attached image. I'd know why there is velocity component also after this node. The tube has quite big dimension, so it should drain all the discharge that flows at the time of the screenshot. Many thanks, Daniele
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Velocity at the tube nodes 9 years 8 months ago #16237

abernard OFFLINE Expert Boarder Posts: 210 Thank you received: 45	Hi Daniele, Your problem may come from the element size distorsion... try to smooth the transition between channel mesh and the rest of the mesh.
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Velocity at the tube nodes 9 years 8 months ago #16238

DanieleD90 OFFLINE Junior Boarder Posts: 55 Thank you received: 3	Thank you, I'll try to do that. By the way, the problem seems to be before the mesh changes.
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Velocity at the tube nodes 9 years 8 months ago #16271

DanieleD90 OFFLINE Junior Boarder Posts: 55 Thank you received: 3	I've tried but nothing... there are still velocity vectors after the inlet tube node. other solution? some parameters that could affect this behaviour?
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Velocity at the tube nodes 9 years 8 months ago #16273

c.coulet
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Hi

I think you didn't understand the concept.
Even if the dimension of the tube is "big" the effect is nodal as it was represented by a sink term in the conservative equation.
So the result is locally wrong.

The main purpose of the tubes in Telemac is to compute a head-loss which depends on local hydraulic condition and allow to represent free and pressure flow in structure which could not be represented with finite elements method.
If the tube never become in charge, you could represent the tube in your mesh but on the contrary, there could be an overflow on the top of the bridge itself and the it's important to take in account the part of the discharge which flow under the bridge to compute a representative head-loss and by consequence to compute an accurate overflow.

Regards

Christophe

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