0
$\begingroup$

I've been fighting with this sim all week. After attempting mantaflow for literally years now I still don't have a handle on how it behaves. Is it mantaflow, or is it me!?

That said, I have a basic fluid sim setup and for no reason the mesh suddenly explodes as if there is a force or invisible boundary affecting it. Yet there is not.

If anyone could open this project and just let me know what I'm missing I would be forever grateful.

PROJECT FILE

It starts out fine: enter image description here

Then a few frames in it suddenly goes crazy: enter image description here

Improve this question
$\endgroup$
5
  • 1
    $\begingroup$ The instability could be related to enabling the Viscosity feature. There is a current bug report about this here: developer.blender.org/T102755 With Viscosity enabled, I get similar unstable results. Disabling viscosity seems to result in a correct flow. $\endgroup$
    – RLGUY
    Commented Jan 6, 2023 at 22:00
  • $\begingroup$ Ah man, thank you for this! I get so overwhelmed with all the other glitches that I totally forgot about the viscosity bug (which I did read about before but forgot). Now if I could figure out why the voxel size, domain size, and baking cache are so fickle my life would be complete ;) $\endgroup$
    – Glen Candle
    Commented Jan 6, 2023 at 23:11
  • $\begingroup$ @RLGUY If you want to write your comment as an answer I will mark it accordingly, thanks $\endgroup$
    – Glen Candle
    Commented Jan 6, 2023 at 23:11
  • $\begingroup$ Hey @RLGUY I just noticed that you are developer of the FLIP Fluids add-on. I'm installing the demo now to see if it works. Quick question- how does scale affect a fluid sim using the plugin? In other words, can I work on a small scene that has a domain size of roughly 12-inches, or should I work at a larger scale? $\endgroup$
    – Glen Candle
    Commented Jan 6, 2023 at 23:28
  • 1
    $\begingroup$ The addon simulator should be able to handle small scales around 12-inches, but may require changing some settings for better results (tips in documentation: github.com/rlguy/Blender-FLIP-Fluids/wiki/…). Scaling larger can sometimes be easier to work with if the end result is intended to be in slow motion. Feel free to contact us with questions at support [at] flipfluids [dot] com. $\endgroup$
    – RLGUY
    Commented Jan 7, 2023 at 1:48

1 Answer 1

Reset to default
1
$\begingroup$

The instability may be related to enabling the Viscosity feature. There is a current bug report about this here: https://developer.blender.org/T102755

With Viscosity enabled, I get similar unstable results. Disabling viscosity seems to result in a correct flow.

Improve this answer
$\endgroup$

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .