Simulating particles & liquid in a cyclone

[JuhaHo]

From  your screenshot, your Fluid Force is overriding any other forces above it. If you want additional gravity, put the gravity force below the Fluid Force operator. Regular Force operators (where you've got your gravity assigned) are additive, so the force will be added onto the Fluid Force velocities.

Thanks,

I tested this, but things became even worse.

What about these built-in forces? Should I enable those?