open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi, everyone

I want to couple telemac2d with sisyphe and the suspended sediment is discharged continuously from the headwater. I assume that initially there is no sediment in the water column and at the seabed for the computation purpose. But the result shows the error:

EQUNOR (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 120 RELATIVE PRECISION: NaN
EQUNOR (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 120 RELATIVE PRECISION: NaN
GRACJG (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 600 RELATIVE PRECISION: NaN
EQUNOR (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 120 RELATIVE PRECISION: NaN
GRACJG (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 600 RELATIVE PRECISION: NaN
EQUNOR (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 120 RELATIVE PRECISION: NaN
GRACJG (BIEF) : EXCEEDING MAXIMUM ITERATIONS: 600 RELATIVE PRECISION: NaN
...

I think the erosion rate E was limited by the available sediment on the seabed at each time step. When the total sediment deposited on the seabed divided by the timestep was less than the calculated erosion rate E, the erosion rate should adjusted to be equivalent to the available sediment on the seabed divided by timestep.But I donot know how to do it.

Do you have any suggestions for my case?

Thanks a lot.

Hello,

does the hydrodynamic model work satisfactorly without coupling to Sisyphe and without Tracer in Telemac-2D? I would start here.
And a too high time step is often likely the source of the error: EXCEEDING MAXIMUM ITERATIONS.
Other point: you don't need to specify a tracer in Telemac-2D if you couple it with Sisyphe which in this case is solving the advection-diffusion equation for the suspended load material.
I would try also another simpler turbulence model like the the constant eddy viscosity model.


Hope this helps,
Clemens

Hello,
Yes, it works well without coupling with Sisyphe and without tracer in Telemac-2D.

I have reduce the time step to 10s, but it didnot work. I will try as you say. Thanks a lot.

bestreagrds

zqzuoan