I'm doing a lava (viscous fluid sim). Flip particles are emitted from a ball, fall down, hit the collider. And I add a uniform pop force(+Z) to pull the particles along Z axis. This works OK when the density attribute is turned off. But when I turn it on, the particles just collapse on themselves, snapped on the collider... I literaly have no clue why this happens...

PS：the particles have density attribute on themselves. The friction is low. So there must be some other reasons...




hip file:

I think you should check off "solver pressure with adaptivity" if "density by attribute" was on
due to the unsupported varying density in the adaptive solver currently.