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TOPIC: How to assign several prescribed flows

How to assign several prescribed flows 4 years 3 months ago #36458

  • Mustermann
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Hi,

I use Telemac to model the hydrodynamics of a lake and defined the tributaries as prescribed flow boundaries. How to assign them different flows in the .cas file?

Thank you very much in advance.
Clemens
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How to assign several prescribed flows 4 years 3 months ago #36461

  • Leballeur
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Hi Clemens,

The section 4.2 of the telemac2d user manual will give you the answer.
A quick research of the keyword “PRESCRIBED FLOWRATES” among the examples shows that the test case “confluence” uses 3 liquid boundaries including 2 with different prescribed flowrates.

I hope it helps.

Regards,
Laurent
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How to assign several prescribed flows 4 years 3 months ago #36493

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Hi Laurent,

thanks for the help.
I tried to follow the example, but unfortunately there is no real hint given how to define the order of the flow and how to find out which one is at which position. I assume it is somehow related to the node number, but not sure about that. According to the user manual there should also be the option to prescribe the flowrates in the boundary conditions file, how can this be done?

Regards,
- Clemens
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How to assign several prescribed flows 4 years 3 months ago #36495

  • pham
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Hello Clemens,

When running for example confluence in serial mode, you have the following writing in the listing:
THERE IS 3 LIQUID BOUNDARIES:

BOUNDARY 1 :
BEGINS AT BOUNDARY POINT: 421 , WITH GLOBAL NUMBER: 1
AND COORDINATES: 0.000000 0.000000
ENDS AT BOUNDARY POINT: 429 , WITH GLOBAL NUMBER: 2370
AND COORDINATES: 0.000000 0.8000000

BOUNDARY 2 :
BEGINS AT BOUNDARY POINT: 144 , WITH GLOBAL NUMBER: 2011
AND COORDINATES: -7.371499 3.330000
ENDS AT BOUNDARY POINT: 150 , WITH GLOBAL NUMBER: 2012
AND COORDINATES: -7.981899 3.330000

BOUNDARY 3 :
BEGINS AT BOUNDARY POINT: 256 , WITH GLOBAL NUMBER: 1507
AND COORDINATES: -10.80000 0.8000000
ENDS AT BOUNDARY POINT: 264 , WITH GLOBAL NUMBER: 1508
AND COORDINATES: -10.80000 0.000000

You then have the order of every liquid boundaries and the the number of first and last node.
Boundaries are described anticlockwise.

You can do the same with your geometry with only 1 time step.

Otherwise, and more easily, you can run a postel script (e.g. for confluence example):
plot.py mesh2d geo_confluence.slf -b geo_confluence.cli --liq-bnd

Hope this helps,

Chi-Tuan
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How to assign several prescribed flows 4 years 3 months ago #36496

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Example of the generated figure
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