Which spectrum is used for FFT waves?

[ConnorDTaylor]

Is the P-M spectrum or ECKV spectrum used in the 'fft' wave algorithm?

I am trying to determine which of the wave spectrums are being used, in the source code I am seeing the P-M spectrum and the ECKV spectrum. It is unclear to me which spectrum is actually being used in the simulator though.

I thought it was the P-M spectrum with the cosine-2s spreading function, but I don't know for sure.

Connor

[srmainwaring]

ECKV with ECKV spreading for standing waves or Cos2s for travelling (the default).

https://github.com/srmainwaring/asv_wave_sim/blob/40eed5158fcab37421826ffa3ba33aab94d55e28/gz-waves/src/LinearRandomFFTWaveSimulation.cc#L283-L297

[ConnorDTaylor]

For my understanding: Do both of these spreading functions get used in the simulator simultaneously? Or is there a setting which defines which spreading function is used?

[srmainwaring]

Looks like it's hardcoded to use the travelling wave version:

https://github.com/srmainwaring/asv_wave_sim/blob/40eed5158fcab37421826ffa3ba33aab94d55e28/gz-waves/src/LinearRandomFFTWaveSimulationImpl.hh#L213

So, Cos2s always.