open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,there.

When I try to run a flooding case, I set "INITIAL CONDITIONS = 'ZERO DEPTH' "

but the following error occurs:

DEBIMP : PROBLEM ON BOUNDARY NUMBER 1
GIVE A VELOCITY PROFILE
IN THE BOUNDARY CONDITIONS FILE
OR CHECK THE WATER DEPTHS

According to the hint , I add the "VELOCITY PROFILES = 1"

However, it seems that the improvement doesn't work.

I wonder if something else should be done to solve the problem.

Could someone be nice to tell me how to do next?

Thanks in advance.

Best wishes

Hello,

There are many posts on this subject. If you want to start from a dry land, your flow will be supercritical at the beginning, so at your entrance you must specify also the depth, or at least you must have some water on this boundary in the initial conditions.

With best regards,

Jean-Michel Hervouet

Thank you, jmhervouet.

Do you mean the depth value(which is not zero) is necessary for the computation?

If thus, I don't think the following error hint is quite accurate.

But, I'm not sure about this~~~

DEBIMP : PROBLEM ON BOUNDARY NUMBER 1
GIVE A VELOCITY PROFILE
IN THE BOUNDARY CONDITIONS FILE
OR CHECK THE WATER DEPTHS

Best wishes

Hello,

The hint is CHECK THE WATER DEPTHS, but I'll be more explicit in the next version because this question is often raised.

Regards,

JMH

Hello,jmhervouet

Would you please tell me when the free boundary condition (i.e.4,4,4) and incident wave boundary condition(i.e.1.1.1) should be used,respectively?

For a flooding case with open boundary, which one is more proper?

Besides, whichever of the two above boundary condition is used, the SL value is required.

I'm not quite sure of how the value should be given.

Best wishes

Hello,

The incident wave boundary condition should never be used, it will be removed from the next version and is replaced with the Thompson boundary condition.

Condition 4 4 4 is for supercritical exit. Flooding on a dry area is generally supercritical, but when the depth increases it may become again fluvial.

Regards,

JMH