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TOPIC: Uniform flow in a circular channel

Uniform flow in a circular channel 6 years 3 months ago #31040

  • cinschm
  • cinschm's Avatar
Hello, friends.

I'm trying to simulate a very simple flow in a circular channel. It consists on a half tube, discharge of 12 l/s, ks=1mm and I should obtain an uniform flow of 10.2 cm depth (these data was taken from an article whose results I'm trying to reproduce using Telemac).

It occurs that, setting these conditions to the model, I'm not obtaining an uniform flow, and the water dephts are higher than I was expecting.
I'm wondering if I'm setting some conditions in my cas file that are not compatible to uniform flow condition.

I'm attaching my model files, I'll be very thankful if someone could help me :)
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Uniform flow in a circular channel 6 years 3 months ago #31049

  • riadh
  • riadh's Avatar
Hello

while reproducing the case, it is not normal to set the hydraulic boundary conditions and geometry to the model. However, the friction coeffcient, is not straightforward. This latter reproduces the friction effects but not only. That's why you have to change it and use it as a calibration parameter.
You are saying that the water depth is high, this means that the friction coefficient could be high, reduce it and see.
On the other hand, your model will have very probably severe wetting and drying episodes. It is recommanded to use schemes 13 or 14 in these cases:

TYPE OF ADVECTION : 14;5

Telemac will ask you to add several other option with this advection scheme, so follow the instructions or see the user manual.

with my kind regards

Riadh
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Uniform flow in a circular channel 6 years 3 months ago #31141

  • cinschm
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Hello, Riadh!
Thank you so much for you reply!!! :cheer:
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