open TELEMAC-MASCARET The mathematically superior suite of solvers

Hello,

I am a newbie in Telemac-Tomawac coupling - We are trying to get Significant wave height during a typhoon period (maximum recorded 4.7 m) but our model gives values really small (0.2 m to 0.6 m).

First, we are trying a constant wind corresponding to the amplitude of 20 m/s
After some few tests, the wave height remains smaller than the recorded value - tides are forced at the boundary...

If someone could have a look to our steering files, and geometry, boundary files and tell me if I can improve anything ...That would be really helpful :)



Thanks;

Adam

PS: Attached the files - Coupling Telemac3D and Tomawac

Hi
Before running coupled simulations, try to just run Tomawac as stand alone.
the coupling will just gives you the water level but as a first approx you could consider a fix value directly given in the tomawac steering file...
Even you give a constant wind, as there is a wind file I think this is the file which is considered so first check if the wind is really at the value you want...
Finally, you mesh is probably too rough end it's extend too small. Wave generation by wind in a such small domain should not be the most important process in comparison to the waves coming from the larger external area

Hope this helps

Hi,

Thanks for your suggestions !

Yes the wind is not read from the file, I checked the values is constant.

Unfortunately, cannot extend the region, the bathymetry is only provided in this small region... and I am running Telemac in sequential..

I runned Tomawac only without coupling - still the same result (with and without winds) - See the attached files uncoupled (with and without winds) and coupling results

THe uncoupled tomawac without winds (the waveheight decreases to 0 after the first time step since we consider a nil spectrum at the boundary...)

Any help would be really appreciated, thanks again,

Adam

Hello,

If you don't have a fetch big enough so that your waves can raise you will never get the wave height you observe in reality. The problem is not a coupling problem, but simply the model you run. Do you think that in the physical problem the spectrum at the boundary is nill ?

hope it helps.