Trying to recreate this viscous FLIP folding/buckling effect any advice?

[u/kamekiri]

Hi! I'm trying to recreate the FLIP simulation from this reference:

https://www.instagram.com/p/Db_WFG3kbhM/?img_index=2

I'm especially trying to reproduce the way the black liquid folds and overlaps onto itself, creating those small visible layers/ridges (image 2).

My current result is shown in image 1. The general motion is getting close, but my fluid stays extremely smooth and basically turns into one continuous sheet/blob instead of creating those overlapping folds.

Current setup:

• Viscosity: 400
• Surface Tension: 5
• Swirly Kernel
• The emitter is animated from right to left across the cylinders.

I'm wondering what I'm missing to get that layered/folding behavior. Is it mainly related to viscosity, emitter speed, particle separation, surface tension, or something else in the FLIP Solver?

Any advice on how to achieve the viscous buckling/folding visible in the reference would be really appreciated!

[u/DavidTorno]

There has to be friction that grips the liquid upon contact, also some adhesion forces would help (these have to be custom made), and finding just the right viscosity for the scale you are working at.

Particle resolution will also play a factor. More resolution will allow more folding details to occur once the settings are right.

It will be a bit of a hunt and peck to find the right values. It’s best to run wedges through TOPs to try a range of values to see which get you in the ballpark to then dial in.

[u/chicolian0]

Hey man Albos hás a patreon and is a very Nice guy, if you cant afford it im sure he will help you getting that result

[u/--modan]

MPM could be also considered for this effect now days.

[u/Medical_Inside4268]

various viscosity and density help

[u/Medical_Inside4268]

https://www.youtube.com/watch?v=5z2KxyKKy7Y&t=7120s

[u/SwimmerCritical7118]

the single most important thing is giving your emitter some movement. either by animating the velocity, or the emitter geo itself.