I wanna make a cloudy sky (no big deal - thx for the samples ). However I want to animate to a clear sky. So all the clouds move away..... Since I never have done anythink with fluids - I can't finde any value in the fluids to do this.....
Perhaps you might wish to simply animate the position of the fluid container.. the edgeDropoff would need to be high enough to avoid a sharp edge. You could also increase the transparency over time.
If you adjust the texture noise values, lowering the frequency, increasing the depth, playing with the ratio and thresholds, then you could get cloud groups that are surrounded by large empty patches. One could then simply animate the texture xz offsets to move the texture until the view sees mainly an empty spot.
Another possiblity is to use a projective texture(shading network) to mask out some clouds.. transparency might be the best attribute to texture, although one may need to increase the volumeSamplesOverride on the fluid when doing this.