When i enter a Externally generated wave-elevation time series of breaking wave, I found that the input was different from the wave elevation diagram I generated, and I tried repeatedly but never came up with an ideal waveform diagram. Is the input file already processed by OpenFast.
Dear @ShaoYang.Wang,
Presumably you are using WaveMod = 5? Does your wave-elevation file extend to WaveTMax and match the time step of WaveDT? Are you applying low- or high-frequency cut-offs, WvLowCOff and/or WvHiCOff.
Best regards,
Dear @Jason.Jonkman ,
Thank you for your reply！
Yes, I using WaveMod = 5. And the parameter settings of the wave have matched ‘WaveTMax’ and ‘WaveDT’.
I supposed ‘WvLowCOf’, ‘WvHiCOff’ and parameters in 2ND-ORDER WAVES may can’t satisfy this kind of Freak wave, which means it need 3rd or higher waves settings . I’m not sure if I’m right.
I found that there were indeed a lot of changes when I changed these parameters in ‘WvLowCOf’, ‘WvHiCOff’ and parameters in 2ND-ORDER WAVES 。Thankes very much and I’ll try to adjust these parameters a little more.
Best Regards,
Shaoyang
1 Like
Dear @ShaoYang.Wang,
If you want to get exactly the wave elevation you’ve specified back out using WaveMod = 5, I would set WvLowCOff = 0 and WvHiCOff > pi/WaveDT, which would otherwise remove energy from the specified wave. I would also disable second-order wave kinematics (WvDiffQTF = WvSumQTF = FALSE), which would add energy from the specified wave.
Best regards,
Dear Jason.Jonkman,
Following your suggestion I got the desired result.
Thanks!
Best Regards,
Shaoyang