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Maniphest T80877

Quick smoke vorticity is broken.
Confirmed, NormalPublicBUG
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Description

System Information
Operating system: Windows 10.
Graphics card: NVIDIA GeForce RTX 2080 Super

Blender Version
Broken: (version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: 0330d1af29c0, type: Release
The same is on experimental 2.91

system-info.txt22 KBDownload

Worked: (newest version of Blender that worked as expected)
I'm not sure, but in video tutorial of Blender 2.7 is working correctly. Link to vid: https://www.youtube.com/watch?v=BhjK-6t9Gqs&t=2m10s

Short description of error
When you add vorticity to smoke sim it does something crazy,video with 0 vorticity:

smoke_novorticity.wmv3 MBDownload

With vorticity value of 3 here is what happens:

smoke_vorticity.wmv3 MBDownload

It happens a bit differently on different strength but once you add any vorticity it goes wrongly.

Exact steps for others to reproduce the error
The file is simple - adding icosphere, make couple keyframes to animate it. Add quick smoke, adjust domain. For emitter make temp.diff -1, enable initial velocity. For smoke domain set vorticity to 3.

smoke_voticity.blend910 KBDownload

Related Objects

Event Timeline

Anna (devox) created this task.Sep 17 2020, 11:51 AM
Anna (devox) updated the task description. (Show Details)Sep 17 2020, 11:54 AM
Anna (devox) updated the task description. (Show Details)Sep 17 2020, 1:34 PM
Germano Cavalcante (mano-wii) added subscribers: Sebastián Barschkis (sebbas), Germano Cavalcante (mano-wii).Sep 18 2020, 8:39 PM

2.7 had another fluid simulation system.
blender 2.7 tutorials no longer apply with 2.8's new fluid system.

Maybe now 3.0 is a high value for turbulence.
I don't think this is a bug.
@Sebastián Barschkis (sebbas), what do you think?

Anna (devox) added a comment.Sep 24 2020, 2:47 PM

Even with lower value, 0.07 for example, it starts ok, but if simulation is longer especially with turbulence field on it does that volume noise closer to the end. I'm not sure if this is an expected behavior.

Sebastián Barschkis (sebbas) added a comment.Sep 24 2020, 2:56 PM

This could be related to the issue from T79537. Will investigate this ..

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Oct 12 2020, 12:59 PM
Philipp Oeser (lichtwerk) added a project: Nodes & Physics.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

@Sebastián Barschkis (sebbas): are you still investigating this? I guess it can be confirmed?

Jacques Lucke (JacquesLucke) changed the subtype of this task from "Report" to "Bug".Oct 14 2020, 11:45 AM
Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).

Setting this as a bug, because I can still reproduce it and this is something that should be fixed.

Dalai Felinto (dfelinto) moved this task from Backlog to Bugs on the Nodes & Physics board.Mar 2 2021, 11:29 AM
Omar Emara (OmarSquircleArt) merged a task: T96208: Fluid sim (smoke/fire) has issues with multiple objects in one domain.Jun 7 2022, 3:05 PM
Omar Emara (OmarSquircleArt) added subscribers: Robert Nederhorst (rnederhorst), Ethan Hall (Ethan1080), Omar Emara (OmarSquircleArt).