Mantaflow - liquid particles show up in organized unrealistic structure #73552

New Issue

Andrew Sprok · 2020-02-02T23:21:54+01:00

Andrew Sprok commented

2020-02-02 23:21:54 +01:00

System Information
Operating system: Windows 10 Home, Version 10.0.18363 Build 18363

Graphics card: ASUS R9 290X DirectCU II OC

Blender Version
Broken: V2.82 Beta, 3ba5461af0, 2020-02-01,
Worked:

Short description of error

In this attached scene a cube emits a water jet while it is moving in the Y direction in stationary water close to its surface, simulating a primitive water propulsion. I tried to do different settings for the fluid particles but the particles always show up in an organized 3D structure making it look very unrealistic as the pattern is very noticeable from nearly any direction. I gave the water particles red color to make the pattern a lot more visible.
I also noticed that if I change the emitter cube initial velocity to a higher value than the previous one was, then I need to change the simulation speed to a lower value to get continuous jet of liquid flow, otherwise it seems like the fluid is pulsing. The bigger the velocity increase the bigger the gaps between the pulses.
The third thing that I noticed, if the emitting cube size is under 0.15 for all 3 axis then it no longer emits liquid. Initially I tried it with 0.1 in all 3 axis and did not emit fluid.

Exact steps for others to reproduce the error

To test the particle structure bake the fluid parts and render or even just deactivate the fluid and the mesh of the domain and view the fluid particles only rotating the view to examine the particle structure.
For breaking the stream of fluid change the Y direction initial velocity to about 2 and bake, examine fluid flow pattern.
Change the emitting cube size to 0.1 or smaller to all axis and bake.

Mantaflow Jet Test 1.blend

System Information Operating system: Windows 10 Home, Version 10.0.18363 Build 18363 Graphics card: ASUS R9 290X DirectCU II OC Blender Version Broken: V2.82 Beta, 3ba5461af0c8, 2020-02-01, Worked: **Short description of error** 1. In this attached scene a cube emits a water jet while it is moving in the Y direction in stationary water close to its surface, simulating a primitive water propulsion. I tried to do different settings for the fluid particles but the particles always show up in an organized 3D structure making it look very unrealistic as the pattern is very noticeable from nearly any direction. I gave the water particles red color to make the pattern a lot more visible. 2. I also noticed that if I change the emitter cube initial velocity to a higher value than the previous one was, then I need to change the simulation speed to a lower value to get continuous jet of liquid flow, otherwise it seems like the fluid is pulsing. The bigger the velocity increase the bigger the gaps between the pulses. 3. The third thing that I noticed, if the emitting cube size is under 0.15 for all 3 axis then it no longer emits liquid. Initially I tried it with 0.1 in all 3 axis and did not emit fluid. **Exact steps for others to reproduce the error** 1. To test the particle structure bake the fluid parts and render or even just deactivate the fluid and the mesh of the domain and view the fluid particles only rotating the view to examine the particle structure. 2. For breaking the stream of fluid change the Y direction initial velocity to about 2 and bake, examine fluid flow pattern. 3. Change the emitting cube size to 0.1 or smaller to all axis and bake. ![Mantaflow Liquid Particles.JPG](https://archive.blender.org/developer/F8318030/Mantaflow_Liquid_Particles.JPG) [Mantaflow Jet Test 1.blend](https://archive.blender.org/developer/F8318033/Mantaflow_Jet_Test_1.blend)

Andrew Sprok commented

2020-02-02 23:21:54 +01:00

Added subscriber: @DrSpock

Andrew Sprok changed title from ~~Mantaflow - liquid particles show up in organized structure~~ to Mantaflow - liquid particles show up in organized unrealistic structure

2020-02-04 04:59:10 +01:00

Marco commented

2020-02-04 13:40:15 +01:00

Added subscriber: @nacioss

Marco commented

2020-02-04 13:40:16 +01:00

Same problem here

![image.png](https://archive.blender.org/developer/F8320700/image.png) Same problem here

Andrew Sprok commented

2020-02-05 04:38:06 +01:00

I tested it again with the latest daily build f51286cb8c, 2020-02-04 and it is still the same. I wanted to make sure that I did not miss some fixes or updates. The red bits in the water are the particles of course, for better observation.

0001-0075.mp4

I tested it again with the latest daily build f51286cb8cc8, 2020-02-04 and it is still the same. I wanted to make sure that I did not miss some fixes or updates. The red bits in the water are the particles of course, for better observation. [0001-0075.mp4](https://archive.blender.org/developer/F8322166/0001-0075.mp4)

Vitor Boschi commented

2020-02-05 15:00:03 +01:00

Added subscriber: @vitorboschi

Germano Cavalcante commented

2020-02-06 17:02:31 +01:00

Added subscribers: @sebbas, @mano-wii

Germano Cavalcante commented

2020-02-06 17:02:31 +01:00

I can confirm the regular distribution of the particles, which is impossible in the real world, but I can't say if this is an error in the settings, a limitation of the resolution or something else ...
@sebbas?

I can confirm the regular distribution of the particles, which is impossible in the real world, but I can't say if this is an error in the settings, a limitation of the resolution or something else ... @sebbas?

Sebastián Barschkis commented

2020-02-07 00:30:08 +01:00

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

Bjoern Siegert commented

2020-03-13 19:22:58 +01:00

Added subscriber: @nicelife

Casey Frost commented

2020-03-14 16:30:11 +01:00

Added subscriber: @HardRooster

Adam commented

2020-04-08 16:59:22 +02:00

Added subscriber: @acm1979

blender-admin commented

2020-04-08 18:29:11 +02:00

This issue was referenced by 4a6f715421

This issue was referenced by 4a6f715421af0d6cc15dc9e7ab6f3f90438d0a3d

Sebastián Barschkis commented

2020-04-08 18:30:44 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sebastián Barschkis closed this issue

2020-04-08 18:30:44 +02:00

Sebastián Barschkis self-assigned this 2020-04-08 18:30:44 +02:00

Sebastián Barschkis commented

2020-04-08 18:32:01 +02:00

Issue should be resolved now! Render for frame 75 came out like this:

Issue should be resolved now! Render for frame 75 came out like this: ![fix_T73552.png](https://archive.blender.org/developer/F8456933/fix_T73552.png)

Gaurav Nema commented

2020-04-20 16:07:00 +02:00

Added subscriber: @gaurav.nema

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Mantaflow - liquid particles show up in organized unrealistic structure #73552