Fluid-Fluid Collision Velocity

[jamesearnest244]

Hi,

I'm working on a sim of milk being poured into a cup of coffee. The coffee part is brought into the FLIP Object as Initial Data, and the milk is sourced in with a Volume Source DOP. I would like to control the collision velocity of the two different fluids, so I can control the size of the splash when they meet. The problem is, the Collision Scale attribute on the FLIP solver only controls collisions with other DOP objects, not within the fluid itself. I don't want to increase the velocity of the incoming particles, just to make the reaction of the fluid stronger.

Thanks for any tips!

Edited November 7, 2020 by jamesearnest244

[Vinz]

Hi James

I am just throwing the first fixes that come to my mind (as I have no idea of your level this may be things you know but..):

 

try switch between splashy kernel and swirly kernel (volume motion)

play with velocity smoothing (volume motion)

play with the height in space of you source (emitter) to the impact

make milk more viscous than coffee

add air drag force in DOP

higher substeps will keep the particles from moving too fast between frames

see if Feedback Scale help (volume motion/solver)

the overall scale of your scene will affect greatly the collision result (I would say the larger the scene, the less splashy.. to be confirmed)

 

 

 

Edited November 9, 2020 by Vinz