Mantaflow - liquid particles show up in organized unrealistic structure #73552
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Reference: blender/blender#73552
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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
Added subscriber: @DrSpock
Mantaflow - liquid particles show up in organized structureto Mantaflow - liquid particles show up in organized unrealistic structureAdded subscriber: @nacioss
Same problem here
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
Added subscriber: @vitorboschi
Added subscribers: @sebbas, @mano-wii
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?
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @nicelife
Added subscriber: @HardRooster
Added subscriber: @acm1979
This issue was referenced by
4a6f715421
Changed status from 'Confirmed' to: 'Resolved'
Issue should be resolved now! Render for frame 75 came out like this:
Added subscriber: @gaurav.nema