reconstruction of surface elevation from modes about hos-ocean HOT 5 CLOSED

Dear Wei Zhang,

Yes. You can use LHEEA/Grid2Grid (execution: postGrid2Grid) with modes_HOS_SWENSE.dat to regenerate the surface elevation.

Please try it and let me know if you have a problem.

Best regards,
Young-Myung CHOI

from hos-ocean.

Hello.
Thanks for replying so soon. I am wondering whether I can do that manually. I mean direct use the data? or I just "refine" the solution from the output.

Best
Wei

from hos-ocean.

Dear Wei Zhang,

You can do it manually. There are subroutines in Grid2Grid "src/libGrid2Grid/surf2Vol/HOSOcean/hosOcean/inc"

• init_read_mod: Read HOS parameters (nX, nY, ...)
• read_ascii_mod_HOSOcean: Read HOS modal amplitudes at each HOS time

Because you already know the modal amplitudes at each time, you can reconstruct them by formula.
Or you can refer the subroutine "reconstruction_direct" in HOS-ocean "sources/PostProcessing/reconstruction.f90".

Have a nice day,

Best regards,
Youngmyung CHOI

from hos-ocean.

Dear Wei Zhang,

Complementary to the reply of Youngmyung (thanks for being reactive on this!) this is not possible to reconstruct directly from the file a_3d.dat the free surface elevation / free surface velocity potential.
The point is that a_3d.dat stores only the wavenumbers and modulus of complex modal amplitudes. Then, the phase of each component is the missing information for what you want to achieve.

Best,
Guillaume

from hos-ocean.

Hi @gducrozet & @YoungmChoi
thanks all for reply.
I tried postG2G in grid2grid. still I cannot get perfect solution.see below

and there are some parameters which I don't know how to set.

Best
Wei

from hos-ocean.