Mantaflow - liquid inflow initial velocity settings have no effect #73422
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Reference: blender/blender#73422
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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,
fc1f5bded4
, 2020-01-24, as found on the splash screenWorked: could not get it work on previous versions either
In the attached file the object 'water_jet_inflow' 'Initial Velocity' settings seem to take no effect at all. I tried various combinations of settings and the result was either the same visual output or no output at all.
The objective was to generate a jet like stream as the disk moves to the right, as seen on the attached image by the red arrow path and the file. If I remove the animation of the disk then the particles just flow towards the bottom of the screen and see no velocity change. In the blend 2.82 manual I could only find the old fluid sim related information, nothing about the Mantaflow settings but I tried different combinations and nothing produced any change there.
Also, is the initial velocity x.y and z direction in m/s or what unit is it supposed to be because there is no mention in the popup info when hovering the settings?
Mantaflow Water Jet propulsion test.blend
Added subscriber: @DrSpock
#73425 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @(Deleted)
Added subscriber: @sebbas
Changed status from 'Confirmed' to: 'Needs User Info'
Hi! Can you try to out the latest Blender build. I made some changes to initial velocities in
33317b4647
Also, when I looked at the file I found the following things that are important to keep in mind:
For reference, here is how I changed the emitters from your scene:
Plane emitter:
Volume emitter:
Hi Sebbas,
Thanks for the tips. I tried them and worked.
Not sure what the Normal component does so I left that alone.
What I find difficult is to control the amount of fluid. If the emitter is smaller than 0.1x0.1x0.1 it stops emitting. The other thing is the amount of liquid is dependent on size of the object, the Resolutions Divisions, Time Scale, Liquid Particle Maximum and Initial Velocities. For example I do not know how I could simulate a water hose to have a continuous jet of water coming out of a 1cm orifice and creating a continuous water stream in a 10m x 2m x 2m domain.
I also observed that if I get a good water flow from an object, if I change the domain size to double or triple then every setting is out of place and have to find some combination that works again.
All this experimentation also led me to discover some fluid particle problems which I reported here #73552, if that is actually a problem and not related to some settings.
Changed status from 'Needs User Info' to: 'Resolved'