open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi,

I'm a new user of Tomawac,

I'm using a simple model to begin with boundary conditions prescribed in the parameter file.
When I look at the results in Fudaa, observed values don't match with imposed values. As somebody know why?
I feel I'm not well understanding the concept of spectrum in the wave model and it should be the origin of the mismatch...

Anyway, my final aim is to use variable values in time and space on the boundary. I have read some post explaining how to do it (limwac.f). Will it be the same problem with spectrum or values prescribe in limwac are exactly imposed on the boundary?

Regards

To illustrate my question :
I impose 2 meters of significant wave height in the parameter file.
In Fudaa, I observe 1.26 meters at the beginning and during the simulation on the boundary :

In attachment the parameter, conlim and geo files.

Hi Nicolas,

You should try with a finer discretization of your spectrum by rizing the NUMBER OF DIRECTION.

12 directions mean (0;30;60;90;...;300;330), and your peak direction is 315.

Regards

Hi,

I agree, your discretization may not be fine enough, even for the frequencies. You should look at your spectrum in some points of your domain, and in particular at the boundary, and verify that it is well discretized (otherwise, part of the energy may be cut).

Moreover, as your simulations include source terms, these have an impact on the spectrum, even at the boundary and it can lead to some differences with what you imposed.

Regards,

Elodie

I have taken a NUMBER OF DIRECTION equal to 24 to match with the peak direction equal to 315 and it works! Thank you.

For the frequencies discretization there is no significant differences. I have 1.99 for HS with NUMBER OF FREQUENCIES = 15 and 2.01 for HS with NUMBER OF FREQUENCIES = 30 imposing HS = 2 for both. I will also pay attention to the source terms.

Regards