Hi all!
I'm trying to understand what the workflow is when advecting smoke with an external volume velocity from inside a dop pyro solver.
So far I had no success, and couldn't really find much info about it.
I have some custom volume velocities that I can make work with particles, but not with pyro.

Also, as an alternative, I'd like to try and use the gas turbulence dynamics node, but limit its action to x and z axis.
Is it possible to use a sop solver to change the Y VEL to 0, each frame? is there a more efficient way?

You can source it like you would density, and target the vel field. Usually with an "add" or "pull" operation.

Tanto
You can source it like you would density, and target the vel field. Usually with an "add" or "pull" operation.

this would be from the same source volume, right?

Not necessarily, you can use several source volume nodes with different inputs and merge them.

Also for your second question, just use a volume wrangle before sourcing your velocity, with:

Tanto
Not necessarily, you can use several source volume nodes with different inputs and merge them.

Yes thank you! I made it by merging in a source volume that only had the vel from my other volume and it works fine.
And thank you for the code, I actually added that in a vop to get rid of any velocity pointing upwards on my source, but do you think I can use it inside the pyro solver? I can easily do it with particles, but with Pyro it's a bit of a mystery for me.
Sometimes I apply forces inside the solver that (even if I limit them to only add x and z direction force) end up pushing the sim upwards - or downwards.

Sure, if you locate the sources in the solver, you can do the same using a Gas Field Wrangle, of Gas Field VOP.

Tanto
Sure, if you locate the sources in the solver, you can do the same using a Gas Field Wrangle, of Gas Field VOP.

ah nice,that's the nodes i need then. thank you!