open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi all,

I am a new user of blue kenue and t2d.

I managed to triangulate a chanel in blue kenu, made a selafin file and the bc file. In fudaa-Prepro 1.2.0 edited the boundries in the "View 2d".

On one side I have Liquid with prescribed flowrate (-12m3/s, because it is a discharge) and on the other Liquid with prescribed elevation (81.2m).The chanel is full in the start with the elevation of 81.2m (on both sides).

Telemac is working only when I put in the initial elevation 81.2 and select constant elevation! - don't know if I did good?

The problem is that i don't see in the result file (in blue kenue when I enable animation) that the water is moving along the whole chanel with any time step!

I'm stuck on this for two weeks now, and thought that somebody could look at my files and maybe help a little on how to set up the boundry conditions or if I overloocked something!

Thank you in advance!

A 100 hour timestep on a 1m grid is sure to have generated some errors...
I suggest you look to one of the validation examples as a starting point.
You can find them at "www.opentelemac.org/index.php/validation"

Cheers... Martin

I allready have the validation cases, but I tried only the first few.

The water i moving only on the end of the channel regardless of the time step! (I tried with 1s, 10s, 100s...100hour time steps)

I tried to use a triangulation with bigger grid 2m,3m and 4m with different time steps. Of all my tries, the water is moving only in the end of the Chanel only on a bigger area.

So I took Your advice, and now I'm looking trough the rest of the validation cases.
When I finish, I'll have another go with it!

Thanks Martin!

Hello,

Another thing is that you prescribe a negative discharge at the entrance, while it should probably be 12 m3/s if you want the water to get into the domain.

Regards,

JMH

Hello jmhervouet,

where I have the -12m3/s should be the end of the channel (and the water should flow out of the channel), there I have a pumping station and it pulls out of the channel 12m3/s.

The other end of the channel should be the entrance where I have a lake with a constant elevation of 81.2m and it should feed the pumping station trough the channel!

Thanks for looking at my files and taking the time to give an answer!

Regards,

Bela Varga!

Hello,

So on the lake side, with prescribed elevation and free velocities (5 4 4 in the boundary conditions file), the flow should depend on the initial elevation inside the domain, if it is lower, the gradient should create entering velocities.

JMH

Hello,

If the initial elevation in the channel and in the lake are the same, I supposed that in time a flow should be created in the whole channel thus the lake on the one side feeds the pumping station on the other side trough the channel. But that was not happening...

So I tried to put on the boundary a bigger elevation (82m) than the initial elevation in the domain (81.2m) and entering velocities are created but only on the entrance of the channel (the end of the channel is the same as in the previous case). The water is not flowing trough the channel again!

I had an idea that it may be the courant number that is not set right, I'm
studying that at the moment, and looking trough all of the validation cases!

Thanks for your time JMH!

Regards,
Bela Varga!