smoke spreads

[Alpa24]

Hi,

I am doing smoke effect in huge factory background.
I have made fume which size is 250,350,275.
Smoke goes up strate in size of simple source diameter.
I want that smoke spread as it goes up.
What should i do to spread smoke ?

Thanking you

[Capitanred]

you can add a particle source, which adds only velocty to the voxels. turn on show velocity to see how it affects the grid without the smoke, and when you see how it affects it, then add the smoke, and adjust the values till it spreads right.

I experienced that it works best when adding velocity only when particles are young. ohterwise youll get braches in the smoke, what you probably do not want