how to vary diffusion rate for FLIP streams?

[zephyr707]

Hi all,

I've attached a hip file with 3 fluids mixing together. I am trying to figure out how to vary the diffusion rate for the fluids or even to disable it entirely for a stream. For example, I would like to keep the green diffusing into the red, but have the cyan stream maintain its color and not mix with the red or to mix slightly slower or at a variable rate. I can't figure out how to set it up.

I have tried a separate flipobject and a separate solver and also tried to play with the diffusion Particles parameter, but don't understand how or which "Geometry" to specify.

any help would be much appreciated! and if I'm setting this up all incorrectly please let me know, I'm not sure what the best way to assign color to the box fluid object.

many thanks.

for_odforce_flipgas.hipnc

[ryew]

I don't have time to check the file, but have you tried using different viscosity settings? If you do a search on odforce, someone else was after something similar by using viscosity to keep two fluids separated (oil and water, I think?)

[zephyr707]

hi rye,

thanks for the reply. the liquids in this example file are actually viscous fluids and they do remain separate, but the color diffusion is what I want to control and I'm not sure if that is influenced by viscosity or not. I'll play around with it some more, but it would be nice to control rate of color diffusion separately from viscosity, if possible, as I was also planning on diffusing the viscosity attribute as well as color.

I don't have time to check the file, but have you tried using different viscosity settings? If you do a search on odforce, someone else was after something similar by using viscosity to keep two fluids separated (oil and water, I think?)