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Hello all,

Introducing wind is not causing any change in the output parameters. I have attached the steering file. Also the computation is taking too long. Any suggestions?

Thanks in advance,
Divya

Hi,

you put "CONSIDERATION OF SOURCE TERMS = NON" so no source terms are taking into account, even the wave generation by wind...

Regards,

Elodie

Hi Elodie,

Thanks for your reply. After changing "CONSIDERATION OF SOURCE TERMS=YES", the simulation fails to run. I have added the attachment of the screenshot of the error displayed.

Regards,
Divya

Hi,

your program failed because of a segmentation fault. There is probably a problem related to memory in your fortran file.
Please check the error, as suggested in the message.

Regards,

Elodie

Hi,

Thank you for your reply. The fortran file seems to be working properly if i ignore wind effect. My fortran file is to incorporate temporally varying boundary conditions. Do I need to alter my fortran file to incorporate stationary wind?

Regards,
Divya

Hi,

as explained in the Tomawac documentation, you can specify a stationary wind without any fortran file, using the keywords STATIONARY WIND=YES, WIND VELOCITY ALONG X and WIND VELOCITY ALONG Y (constant and homogeneous velocity in m/s).
If your wind is not stationary but can be described analytically, you can also use the subroutine ANAVEN.f.

Regards,

Elodie

Hi,

Thanks for your reply. That is exactly what I have done. The fortran file is the modified LIMWAC.f in order to incorporate temporally varying boundary conditions and not AVANEN.f. I am sorry if I am sounding redundant. I have attached my fortran file as well.



Thanks,
Divya

Hello Divya,

It may not be the princi.f file that is causing the trouble.

I have run an example where TOMAWAC uses offshore boundary conditions that vary with time (the same princi.f file as above) together with winds that i) vary in time and space (specified in a *.slf file), and ii) are constant in time and space (specified in the steering file). Both cases simulated without problem.

It may not make much sense to use temporally varying wave boundary condition with constant winds (case ii). Maybe this combination is causing something inconsistent in the physics that is making the simulation crash. Or it could be something in the steering file (or one of its parameters).

I hope this helps,

Pat

Hi Pat,

Thanks for your reply. I have been able to have a complete simulation for winds which are constant in time and space. However, inclusion of winds made absolutely no difference in my results. Hence, I tried including keywords such as Linear wave growth and wave growth limiter, I have started to get the error I mentioned in my previous post. Probably, I must try running the simulation for winds varying in time and space.

Thanks again,
Divya

Hi Divya,

If you are not getting any waves generated by wind, this is something worthwhile investigating. I would troubleshoot the problem by going through these incremental steps:

1/ Use SMB equations for the wind and estimate wind generated waves for your site in question. Make sure the fetch you use is similar to what is available in your domain.

2/ Make your entire domain a closed boundary (as if were a closed basin), and run TOMAWAC with constant winds. Compare wind generated waves with 1/.

3/ If satisfied with 2/, add a small constant wave (say 0.1 m) at the offshore boundary and simulate with constant winds. Here you want to ensure that wind generated waves are much higher than what is propagated from the offshore boundary.

Hopefully going through these steps would give you an idea as to what is causing the problem you are experiencing.

Pat