Why are these fluid particles not being blocked correctly?

Question

I am doing this tutorial. I have this cylinder / lamp and an emitter plane (see arrow).

Just below the emitter plane I closed the cylinder with a face. And checked Size Deflect. Also the cylinder has Collision marked. Now the fluid particles should be blocked by the cylinder / lamp ? But as you can they are not. What should I change to block the fluid particles by the lamp ?

I am not very skilled at that so I wont give an answer, but you have a parameter to increase the precision of the simulation. You can find it in the physics section of the particles system. Its name is "subframes" and is set to 0 by default. Set it to 2, for instance. The principle is to calculate more simulation steps (here 2+1) during each rendering frame. To say it differently, for each frame (image) calculated, the simulation calculates more than 1 (here 2+1) frames so that it will not miss the collision (or will miss less) — lemon, Aug 02 '16 at 11:10
You can also change the calculation mode : it is found in "integration". By default "Midpoint". But the tooltip says that "verlet" for instance is more accurate. — lemon, Aug 02 '16 at 11:14
Seriously, I am not... but I learn a lot with the questions : ) — lemon, Aug 02 '16 at 11:15

score 2 · Accepted Answer · edited Apr 13 '17 at 12:57

The most possible reason for that behaviour is non-manifold geometry.

When closing particles within the lamp by filling a face inside of the lamp, you create non-manifold mesh which might be hard to deal with for engine. Particles fly through from the bottom, where the face is created and which should block them.

To make the mesh as manifold one, first delete that inside face. Then you'll need to:

Solidify the mesh (either with Solidify modifier or by extruding geometry in Edit mode and scaling extrusion a bit inside).
Create a face which will block particles. For that, select edge loop, left from original face, bevel it with Ctrl+B and fill 2 new faces (they will be Ngons, however it doesn't really matter here).

Beveled edge loop:

Filling new faces:

Particles will fly inside and collide with walls as expected:

WOW, Mr Zak. That is really a big improvement – Aug 02 '16 at 15:30 — , Aug 02 '16 at 15:30

Why are these fluid particles not being blocked correctly?

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