open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,
My question is about hydraulic stability in low-gradient features such as lake in T2D. The file attached give an example of a lake I'm actually working on. There are 4 tributaries coming in to the lake and 1 outlet. I fixed the discharge at the 4 tributaries and the water level at the outelt. Results show variation in velocity field and some numerical instabilities near shores. There are no "banc decouvrant" on the domain. What modeling approach should we used or which numerical parameters should we adjust in order to get a more stable (damped) result?
Thanks,
Simon

Hello

nice model!
Actually,
- it is a little bit strange that you don't have tidal flat effects on such a model. It depends on what you are planning to simulate but, it could be a smart choice.
- what kind of instability do you have? I guess at the liquid boundaries vicinity. This is normal since you're starting with a cold start (not solution of the equations we're resolving by Telemac). First, you need to generate a physically acceptable state (hot start), by letting the code running for a long time in order to generate a steady state, for instance.
- the clipping option is not recommended, hence put CLIPPING= FALSE
- you're using a single friction coefficient for all the domain, which is not very physically acceptable.

I hope that this helps
with my best regards
Riadh ATA