Initial fill issues...

[Andersep]

Hi there

I have a problem with the initial fill feature. When ever i use it, the liquid "shrinks" or looses volume. I have tried both "initial liquid fill" for an object and the "initial fill up" for the grid. The water level simply drops to about half after a little time and settles there… The number of liquid particles stays the same, so it is not "leaking" - the liquid simply compresses…

Is the liquid supposed to compress like that?

I am using phoenixFD version 3.14 and 3DS MAX 2019.

Any kind of help would be greatly appreciated!!

[Svetlin.Nikolov]

Hey,

Increase your steps per frame - if the simulation is of very low scale, the gravity pulls the entire liquid through the bottom of the bottle in one simulation step, so you need more steps in order to compensate for this.

Cheers!

[Andersep]

Hey,

Increase your steps per frame - if the simulation is of very low scale, the gravity pulls the entire liquid through the bottom of the bottle in one simulation step, so you need more steps in order to compensate for this.

Cheers!

I have tried to increase to 20 steps per frame... It makes no difference what so ever. The number of liquid particles stays the same, but the liquid stille looses volume...

[georgi.zhekov]

What if you increase your scene scale from the Grid rollout?

[Andersep]

What if you increase your scene scale from the Grid rollout?

Increasing the scene scale does not help either... I tried at 10, and et made no difference (and also my beer bottle would be 2.5 meters high at that scale)

[georgi.zhekov]

Is your geometry properly shelled? No open edges, no strange vertices, etc. You can run an STL-check modifier to check it.

[Andersep]

Is your geometry properly shelled? No open edges, no strange vertices, etc. You can run an STL-check modifier to check it.

Yes, everything is properly shelled, and STL check shows no errors. I even tried to make a simpler scene (just a box), and I still have "shrinking" liquid.

[georgi.zhekov]

In order to get the liquid stable you might need even more steps in combination with the bit bigger scale. So try with like 30 steps for example.

If it's still collapsing that much as in the first screenshots that you have attached - send over the scene and we'll take a look.

Thank you,

[Andersep]

At 30 steps there is less shrinkage, but it is still substantial… I have made a simple test scene wich I have attached.

[georgi.zhekov]

This is how it looks with increased scale and steps set to 50. I also narrowed down the gap between the fill and the container so there will be no extra empty space.

[Andersep]

Ok, it is better... There is still a little bit of shrinkage though - I suppose there always will be some shrinkage when using intital fill then?

But thank you so much for your help, I very much appreciate it!

[georgi.zhekov]

If the scale is relatively small like in this case - adding even more steps eventually should do the trick and prevent the shrinkage though this will slow down the sim.

So you can can counter that with increasing the scale