Evan Robinson

should we report bugs we encounter, or is it not worth it since wayland isn't officially supported?

In this case, it seems to be a bug (or limitation) with viscosity enabled. I have seen a few other post that suggest this too, like this:

https://forums.odforce.net/topic/30629-flip-viscosity-collision-object-grid-stepping-artifacts/ [forums.odforce.net]

Your particle separation was too low, but then you had reseed adding in lots of particles. I got better results by setting particle separation to 0.01 (which also improves the resolution of the volumes). After doing that I adjusted the particles per voxel in reseed to be less. Then in the flip solver under volume motion then collisions, setting the surface extrapolation to a low value. That gave me the best results, but it didn't get rid of the issue. I even tried re-creating the setup using the sop flip (just to test it) and it still was broken (see photo below). Honestly I would report to sidefx.

Cola8
So if I go quite low such as 0.5 grid scale it starts to look alright, just that it's super slow

Yea, 0.5 is too low. If you can post the hip file (make sure to freeze any geo being loaded from disk) I can take a look.If you can't post the hip, maybe a simplified version with the same issue. I tried re-creating the issue myself, but I can't.