ChrisCousins

Fixed! By watching the MPM masterclass, which is super-helpful by the way.
The missing checkbox was this one, which watches out for particles creeping through the collider, exactly what I wanted.

Hi - any tips on keeping MPM solver from messing up collisions? I've got some viscous/sticky fluids inside a sealed collider, using the vdb/invert option in the MPM collider node. The simulation always has leaks/errors, it looks like the sim is lagging the animation and this allows the edge particles to escape. See vid attached

Things I've tried:
1. substeps - min/max up to 200/20000
2. CFL - down to 0.01
3. looser/denser meshing for the collider
4. changing collision type to animated deforming (instead of animated/rigid)

Thanks for any advice! Chris

This is probably obvious to everyone but me, but just in case anyone similarly deluded stumbles across this thread...

It's no longer necessary to save out a spectrum file for every frame!

Level 12 is working great, this ocean looks tasty. Now excuse me while I delete a couple of hundred Gb from my cache drive...