Noise Method

– Noise Method is the method you can choose to add some procedural noise to your simulation.

– In older Blender versions this parameter was in the Hight Resolution Tab and you could choose between FFT or Wavelet.

– In 9.2 (stable) the only method available is Wavelet.

– You can control how the Wavelet is applied to your smoke/fire by setting some parameters in this tab.

– You can find some information about the code used by Blender (WAVELET_NOISE.h) here:

An Abstract and a Video

– and here:

A very interesting pdf

Blender Smoke Noise Method