Hi all,

Im trying to set up a fluid solver, but now I'm stuck at the buoyancy. What I want to do, is work with an ambient temperature field (a gradient) instead of a constant value. Is there a a way to achieve this with the standard Gas Bouyancy node?

I also tried to set up a simple gasfieldvop instead, where I subtract the temp field from an ambient temp field and multiply the scaled result to my velocity field.
But here I have the problem that velocity leaks in from top and bottom.

Do you have any ideas, how to solve this?
And is there a way to store the gradient in a 1D lookup table instead of using a 3D volume?

Cheers,
Stefan