[pipi]

Dear Hans,

Good morning! I have a quick question.

I use REEF3D to simulate a wave experiment, in the lab experiment, our wavemaker is a piston, and the motion of the piston is simple harmonic motion. However, due to the set wave height, period and water depth, the wave presents the Stokes theory, so I set the B 92 5 (5th order stokes theory), and the REEF3D model is highly matched with the experimental results.

I am curious if I set B 92 5, does this mean that the wavemaker (DWG) in the REEF3D model is not a simple harmonic motion, but directly generates stoke theory wave? Because if wavemaker in REEF3D directly create Stokes theory wave, even if the results from the model have high consistency with lab experiment, but the boundary condition in this model does not match the physical experiment, I cannot compare them.

Or do you have any other suggestions to simulate this laboratory experiment?

Thanks in advance!

Kind regards
Dongfang

[kamath]

Hi Pipi,

If you select B 92 5, you select wave generation following the 5th-order Stokes wave theory (and therefore follow it up by a B 91/ B 93 call to provide the wave height and wavelength/period)

If you would like to replicate the experiments exactly, meaning you have access to the wavemaker signal and want to use that, then:

Use B 92 20 or 21 and follow the instructions for the file naming for the file that contains said wavemaker motion data.

Hope that helps!

(In my opinion, generation using B 92 5 should not be a problem for comparison with measured data. As long as the far field free surface elevations agree , the rest should be arguably comparable)

Also in your input files, I see you use B 98 4. I would recommend B 98 1/ 2 / 3. I am not sure that the active absorption at the wave generation zone with the DWG method is truly working as it should.
Also B 92 20/ 21 are best compatible with B 98 3.

[pipi]

Thanks so much, Arun!

I try it now.

Kind regards
Dongfang