Starting with an empty hollow cylinder that fills when top is moved

[stelees]

Hi there,
I have a large cylinder in a grid, the grid is filled 100%, it is filled for ocean otherwise the particles seem to settle down in the grid and it doesn't stay full. The cylinder was made into an editable mesh, the top poly removed, a shell added. On top of the cylinder is a lid in two halves, these are animated to open. I would like to have the liquid pour into the empty cylinder as the lid slides open, the problem is the cylinder is always full of particles.
I have put a dummy object inside the cylinder to stop it have liquid then over a frame animate it out through the bottom of the main cylinder with view it would stay empty, but it does not.

What am I missing with this concept?

[Svetlin.Nikolov]

Sounds to me like the ocean fillup is the key here. Better make sure your grid walls are all jammed, and also that the scene scale is correct and you use enough steps per frame so that the liquid does not compress. Now, whether the liquid compresses, leaks out or is destroyed by some moving geometry that puts it into a state it cannot exist, this is up to you to find out - you can follow the Cache File Content box during the timeline and see if the liquid particles remain the same number - if they do, then the liquid compresses.

[stelees]

Hey, I had the walls all closed but then the moving geo has an impact on the whole surface and the liquid hits the walls.. this is meant to be in the ocean (the grid will be a bit bigger). I am not sure how to set this up. I have a dummy object that fills the void for the first few frames and then animates downwards. I have the main cylinder outside the top of the grid just to capture a small amount of water that should drop into the main cylinder when the top panels open, but the main cylinder always has particles in it.
I have attached a basic version of this to see if you can see what I am doing wrong.
Silo.zip

[georgi.zhekov]

Thanks for the scene. So there are two important things to make it work:

1. Make sure that Cylinder010 has the Clear Inside option turned of from the Phoenix properties right-click menu. Here is an example how it looks with Clear Inside on/off - https://docs.chaosgroup.com/display/...andClearInside
2. Set the Initial Fillup% to be something like 95 for example. In your case where it is set to 100%, the simulator will fill the top with liquid every frame so it will look like the whole simulator is always full.