Fluid sim (smoke/fire) has issues with multiple objects in one domain #96208
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Reference: blender/blender#96208
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System Information
Operating system: Win 11
Graphics card: RTX6000
Blender Version
Broken: 3.1.0 RC (March 03)
Worked: N/A
The simulation goes haywire after frame 230. This appears to be an issue with multiple fluid (inflow) objects entering the same fluid domain
Exact steps for others to reproduce the error
see attached blend file. SIm happens very quickly.
After frame 230 the problem will start to become very apparent.fluid-sim-bug.blend
Added subscriber: @RobN
Added subscriber: @OmarEmaraDev
Changed status from 'Needs Triage' to: 'Needs User Info'
I can confirm the issue. But can you try to narrow down its cause as much as possible. For instance, I disabled Dissolve and Noise and the issue still happened, so they are not the case.
Steps to recreate it from the default settings would be good.
Added subscriber: @Ethan-Hall
Turn off
Use Adaptive Time Stepsin the domain object's physics settings. That seems to make the simulation more tame.fluid-sim-bug.mp4
Thanks to you both for this. I am trying to really narrow the issue down.
Did you manage to narrow this issue down?
I couldn't reliably do this unfortunately. I did try but it was a bit cagey and the adaptive time step was a bit better. I then adjusted animations, etc and it sorted it out for the most part. Apologies for any wasted time on this.
That's okay. I will try to do that myself.
Closed as duplicate of #80877
I narrowed it down to the vorticity of the gas, so merging to that report.