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TOPIC: Problem with the normal depth as downstream boundary condition

Problem with the normal depth as downstream boundary condition 9 years 4 months ago #17514

  • arrighi
  • arrighi's Avatar
Hello,

I am a beginner in Mascaret. I have a simple model which works in permanent flow with a constant downstream boundary.

I want to use a normal water depth as downstream boundary but the model does not work anymore.
I try with unsteady conditions but it still doesn't work and this error appears:
“Cross Section # 25 is dry”.

I have also tried to refine the mesh, to change time step, discharge... but it doesn’t seem to help.

Does the function normal depth is supposed to work in steady and unsteady state?

I attached to this post the model.

Can you help me make it works

Thanks in advance

Claire
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Problem with the normal depth as downstream boundary condition 9 years 4 months ago #17520

  • n.goutal
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Hello,

The boundary conditions "normal depth " does not work .

Best regards

NG
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Problem with the normal depth as downstream boundary condition 9 years 4 months ago #17756

  • arrighi
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Hello,

Thank you for your reply.

I also would like to know if the rating curve works in a steady state. When I put it as downstream boundary condition this error appears : Downstream boundary condition # 2 is not of type cote imposee.

Thanks in advance

Claire
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Problem with the normal depth as downstream boundary condition 9 years 4 months ago #17764

  • n.goutal
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Hello,

In case of steady flow , you can't use a rating curve.
You must use a water level as boundary condition.
If you want use a rating curve, you use the unsteady - fluvial model.
Best regards
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Problem with the normal depth as downstream boundary condition 9 years 4 months ago #17765

  • arrighi
  • arrighi's Avatar
Thank you for your reply.

I will try with the unsteady flow.

Claire
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