open TELEMAC-MASCARET The mathematically superior suite of solvers

I'm trying to study the hydraulic jump of the following exercise:

3 slopes Channel :
-0 to 10 meter : 0.25% (Subcritical)
-10 to 20 meter : 3% (Supercritical)
-20 to 25 meter : 0.25% (Subcritical)

Discharge: 0.03 m3/s


In the iteration 24 depth negative occurrences, I do not know if I have a wrong solver parameter

Could you please explain?

Hi
As you're a beginner, it could be great for you to start with some of the examples available in the distribution.
Your case looks like you want to simulate a lab experiment with a very small water depth but you use a too large mesh.
It's also strongly advise to avoid shock at the beginning of simulations so you could try to put the discharge upstream progressively.
Finally you could start with a constant elevation, increase the discharge and slowly decrease the downstream water level to reach the steady state you want to simulate

regards

Hello

As said by Christophe, you can edit existing validation cases:
- hydraulic_jump for transcritical case
- bumpflu for subcritcal case
- bumpcri for supercritical case

These cases are in the folder examples/telemac2d

I hope that this helps

with my best regards

Riadh

I have done what I have been advised, however, there are still mistakes.


The examples do not serve me, since, I need a hydraulic jump due to a change of slope not a hydraulic jump due to a dam.


They have some example of something similar to what I need.

Thanks

Hello,

You can have strange things occuring in the unsteady phase of the computation, so it is better to have parameters that allow tidal flats or dry zones, to cope for temporary situations :

TIDAL FLATS : YES
OPTION FOR THE TREATMENT OF TIDAL FLATS : 1
TREATMENT OF NEGATIVE DEPTHS : 2

With best regards,

Jean-Michel Hervouet