In our simulation, Fluid (water) drops on an obstacle and splashes. It mostly works fine, but there is noticeable part which remains on top of the obstacle! In reality, there should be no water there, as you can see the shape of the obstacle is very rounded.

Is there a setting we are missing?

Our settings: Obstacle is no slip. Fluid is free slip (which, it was assumed, forces water not to stick to obstacle). Water. Baking resolution is 150.

Animation of water sticking to top of rounded cube

See some frames:

(1) Water above rounded cube (2) Water hitting rounded cube (3) Water stuck to rounded cube

based on accepted answer:

Animation of water _not_ sticking to rounded cube


1 Answer 1


The no-slip for the obstacle is incorrect. No-slip as in not slippery so it is sticky.

From the wiki page on obstacles -

  • Noslip causes the fluid to stick to the obstacle (zero velocity).
  • Free(-slip) allows movement along the obstacle (only zero normal velocity).
  • Part(-slip) mixes both types, with 0 being mostly noslip, and 1 being identical to freeslip.
  • $\begingroup$ Thanks for correction. Free-slip was the key. $\endgroup$
    – Developer
    Dec 15, 2013 at 11:28

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