mantaflow instability on high timesteps #89431

New Issue

Ankit Meel · 2021-06-25T12:36:42+02:00

Ankit Meel commented

2021-06-25 12:36:42 +02:00

macOS 10.14
Intel HD 6000

Broken ce64cfd6ed, 2.83.12

error

11110001-0070.mp4

Exact steps for others to reproduce the error

Add quick liquid to default cube.
Set minimum and maximum timesteps to 100.
Bake up to frame 70 and watch the liquid explode.

macOS 10.14 Intel HD 6000 Broken ce64cfd6edc2a0ec0aabfd4daaa5f655763cc74b, 2.83.12 **error** [11110001-0070.mp4](https://archive.blender.org/developer/F9964435/11110001-0070.mp4) **Exact steps for others to reproduce the error** - Add quick liquid to default cube. - Set minimum and maximum timesteps to 100. - Bake up to frame 70 and watch the liquid explode.

Ankit Meel commented

2021-06-25 12:36:42 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Ankit Meel commented

2021-06-25 12:36:42 +02:00

Added subscribers: @ankitm, @Fernando-Alcala

hal9000 commented

2021-07-01 21:33:13 +02:00

Added subscriber: @hal9000

hal9000 commented

2021-07-02 02:43:09 +02:00

Hi there,

out of curiosity I tested the influence of the Particle Radius Parameter since it was mentioned in the documentation to influence the volume of the liquid and hence in part the physicallity (see here).

With equal settings I get for r=Particle Radius:
r=0.5: flip_part_rad_0.5.mp4
r=0.6: flip_part_rad_0.6.mp4
r=0.7: flip_part_rad_0.7.mp4
r=0.8: flip_part_rad_0.8.mp4
r=1.0: Is the default and can be seen in the original post.

If it had a positive influence I would have assumed to observe it at about 0.6 but no improvements are visible. r=0.5 is obviously too small and r>0.6 features much more of the 'random jets'.

In conclusion:
Tweaking the particle radius does not fix the issue.

EDIT: I used Blender 3.0.0-alpha 0ff1c38fcc on Window 10 Home.

Hi there, out of curiosity I tested the influence of the *Particle Radius* Parameter since it was mentioned in the documentation to influence the volume of the liquid and hence in part the physicallity (see [here](https://docs.blender.org/manual/en/latest/physics/fluid/type/domain/settings.html#liquid)). With equal settings I get for `r=Particle Radius`: r=0.5: [flip_part_rad_0.5.mp4](https://archive.blender.org/developer/F10208343/flip_part_rad_0.5.mp4) r=0.6: [flip_part_rad_0.6.mp4](https://archive.blender.org/developer/F10208338/flip_part_rad_0.6.mp4) r=0.7: [flip_part_rad_0.7.mp4](https://archive.blender.org/developer/F10208341/flip_part_rad_0.7.mp4) r=0.8: [flip_part_rad_0.8.mp4](https://archive.blender.org/developer/F10208342/flip_part_rad_0.8.mp4) r=1.0: Is the default and can be seen in the original post. If it had a positive influence I would have assumed to observe it at about 0.6 but no improvements are visible. r=0.5 is obviously too small and r>0.6 features much more of the 'random jets'. In conclusion: **Tweaking the particle radius does not fix the issue.** EDIT: I used Blender 3.0.0-alpha 0ff1c38fcc8c on Window 10 Home.

Dalai Felinto commented

2022-05-09 10:59:11 +02:00

Mantaflow (fluid simulator) has no active developer at the moment. Moving those reports as known issues so at least other users can find their issues already reported.

Philipp Oeser removed the

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mantaflow instability on high timesteps #89431