Fluid Simulation Creating More Fluid Out of Thin Air. #114506

New Issue

Quinn-I · 2023-11-05T20:48:51+01:00

Quinn-I commented

2023-11-05 20:48:51 +01:00

System Information
Operating system: Linux-6.2.0-33-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce RTX 4070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 530.30.02

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: N/A

Short description of error
Fluid simulation creates new fluid out of thin air

Exact steps for others to reproduce the error
Take the basic cube in blender, and run the "Quick Liquid" on it. Increase the resolution to 64 and use type All with resume enabled. Select the cube and make sure it is set to "Geometry". Bake and then watch the results. More fluid appears that the volume of the original cube.

**System Information** Operating system: Linux-6.2.0-33-generic-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce RTX 4070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 530.30.02 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: N/A **Short description of error** Fluid simulation creates new fluid out of thin air **Exact steps for others to reproduce the error** Take the basic cube in blender, and run the "Quick Liquid" on it. Increase the resolution to 64 and use type All with resume enabled. Select the cube and make sure it is set to "Geometry". Bake and then watch the results. More fluid appears that the volume of the original cube.

Quinn-I added the

labels 2023-11-05 20:48:51 +01:00

Quinn-I commented

2023-11-05 20:49:15 +01:00

Update: Just tried the same on the newest version of blender, same issue. (3.6.5 LTS)

Quinn-I commented

2023-11-06 02:58:36 +01:00

I have another example (more complex but same general idea)

One again, it uses a cube with "Gemetry" not inflow or outflow.

I have another example (more complex but same general idea) One again, it uses a cube with "Gemetry" not inflow or outflow.

0001-0250.mkv

7.6 MiB

Pratik Borhade commented

2023-11-06 06:04:04 +01:00

More fluid appears that the volume of the original cube.

Hi, thanks for the report. Is it observable at start frame or when fluid leaves the source geometry?
I think I'm able to confirm the behavior but wanted to double check before we proceed.

> More fluid appears that the volume of the original cube. Hi, thanks for the report. Is it observable at start frame or when fluid leaves the source geometry? I think I'm able to confirm the behavior but wanted to double check before we proceed.

Pratik Borhade added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-11-06 06:04:12 +01:00

Quinn-I commented

2023-11-23 21:53:52 +01:00

I'm not sure, it seems to be when it leaves the geometry. When it just sits idle, nothing seems to happen, but if there is interaction or if it falls or anything, it appears to create new fluid.

Pratik Borhade commented

2023-11-24 06:24:43 +01:00

Hi, would be helpful if you can highlight the exact issue in screenshot or uploaded video above.

Quinn-I commented

2023-11-24 23:42:24 +01:00

Well the issue is my fluid sim is creating more fluid out of nothing. I have run several tests, and as far as I can tell, it only happens when the fluid is moved from the geometry, either by gravity or collisions, as shown in the attached video.

Pratik Borhade added

Status

Needs Triage

and removed

Status

Needs Information from User

labels 2023-11-25 06:56:13 +01:00

Philipp Oeser commented

2024-01-02 14:27:27 +01:00

Can confirm the problem.

Turning OFF Use Adaptive Time Steps kind of gets rid of the problem.

This issue has been reported before however, see #77510, will close as a duplicate.
Please subscribe in #77510 if you want further updates.

Can confirm the problem. Turning OFF `Use Adaptive Time Steps` kind of gets rid of the problem. This issue has been reported before however, see #77510, will close as a duplicate. Please subscribe in #77510 if you want further updates.

Philipp Oeser closed this issue

2024-01-02 14:27:30 +01:00

Blender Bot added

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labels 2024-01-02 14:27:31 +01:00

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