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srmainwaring / asv_wave_sim

This package contains plugins that support the simulation of waves and surface vessels in Gazebo.
GNU General Public License v3.0
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Which spectrum is used for FFT waves? #169

Closed ConnorDTaylor closed 4 months ago

ConnorDTaylor commented 4 months ago

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 commented 4 months ago

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 commented 4 months ago

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 commented 4 months ago

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.