open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I want to modelize in steady flow a “lateral wasteweir/déversoir lateral”.

I have tried two models with and without “lateral wasteweir/déversoir lateral” and I have got same results !

Does “lateral wasteweir/déversoir lateral” work in the 3.5 version of fudaa_mascaret ?

Thanks for advance

Valérie

Hi
As Mascaret version are always validate, I would says yes this works...
But without any other information about your model, it's difficult to say more.
Please join you model maybe with a small description in order to test your case and check if this is an error on your side or a bug in the code

Regards

Hi,
Thank you for your answer and for your help.
I join you two models :
- The first is the model (M3) with two laterals weirs followed by an usual weir (crest view side) ;
- In the second model (M4) the laterals weirs are highest, so laterals weirs don’t overflow.
Thank you
Valérie

I can’t join models by “.masc”
Here models are..
Valérie

Hi

After investigate the problem, it looks like a "strange bug".
I agree it doesn't work in your case but just because the lateral weirs are not detected by mascaret.
In the computation, as the lateral weirs are treated as the same step as the lateral inflow (with a negative sign of course), you could the problem by adding a lateral inflow in your model with a 0 discharge and then the lateral weir is take in account!

We will investigate more in detail where the problems comes from and solve it.

Thanks for your feedback

Regards

Hi,

Thanks for your answer but sorry I’m not sure to understand your advice “adding a lateral inflow in your model with a 0 discharge and then the lateral weir is take in account”. I don’t understand how the lateral weir is take in account with a 0 discharge. Could you tell me more clarification please ?
Also, I have modelized a simple case to estimate lateral weir impact in steady flow. The upstream flow and the downstream flow is always the same. So I don’t understand how the lateral weir work in a steady flow ?

Thank you very much for your help !

Valérie

Hi

In fact, in the code, the treatment of lateral inflow and lateral weir is done in the same step but only under the condition of the number of inflow is positive. So if you add a lateral inflow in you model, you will activate this part of code and then the lateral weir will work.
the model should look like this:


In the building of the network, the lateral weir looks like an arrow going from the network to the outside, the lateral inflow is the contrary (an arrow coming from the outside to the network). As you could choose the discharge law, if you create a law with Q=0, this will doesn't change your model...

In steady flow, the part of discharge which pass the lateral weir in simply "lost" for the simulation.
The result will look like this:


Hope this helps

Hi
As a complementary advise, it could be good to refine your mesh near the lateral weir location...
The vertical discretization of the cross section could also be refine, (1m is quite large, 0.1 will probably be better)

Regards

Thank you very much for your explanations ! It’s very clear.
Now my model works
Thanks for your advice about the vertical discretization, you’re absolutely right it’s better !

Valérie