open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi all,

I have a UK tidal model working correctly, and I try to include the rivers to improve the flow dynamics in the nearshore region. I have done many tests but unfortunately do not manage to reproduce the river flow.

To prescribe the discharge, I created a SOURCE input in the steering file, as follow:
ABSCISSAE OF SOURCES = -0.324
ORDINATES OF SOURCES = 53.716
WATER DISCHARGE OF SOURCES = 309.0

I also introduced a momentum flux:
VELOCITIES OF THE SOURCES ALONG X = 0.4
VELOCITIES OF THE SOURCES ALONG Y = 0.0

But that did not work.

Would you have any recommendation or advice?
Please find attached my steering file.

Thanks a lot,
Claire

Hi Claire

Just a remark about your computation.
a discharge of about 300 m3/s on a source point is maybe the source of your problem...
Particularly if you just have 0.4 m/s for velocity...
I hope the water height is sufficient

Regards

Hi,

Thanks for your reply.
I see what you mean, so have tried much larger velocities magnitude, so that the source looks more like a source point (Q=A*V, Q being the constant discharge, V the velocity and A the source-cross-section).

But that did not work.

I am missing anything? Has someone already implemented a discharge that way?

Thanks again,
Claire

Hello Claire

If your source points are located at the boundary, this could not give physical velocity field. Rather consider liquid boundary with a prescribed discharge.

I hope that this helps

with my best regards

Riadh

Hi Riadh,

Yes, it does help: I have amended the boundary conditions, and it works now

Thank you very much.
Best regards,
Claire