flush

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naxos
Posts: 1
Joined: Fri Jun 25, 2010 11:36 pm

flush

Post by naxos » Thu Jun 19, 2014 12:46 pm

Hi there,

I'd like to simulate a toilet flush, and i'm a bit stuck here...

I've first tried to mimic the reality : 6 l of water going into tubes... long to simulate and not enough speed / force at the outside of tubes, so no nice splash at the rounded part of the toilet bowl...

Then i tried a circle emitter from the first tube : same...

So i tried to put an emitter at each hole (2 mains on sides, and 7 smaller ones, following the toilet actual geometry)...
But the gravity makes the water to fall down too quickly, no nice splash in the bowl...
I've tried to animate the gravity, but it behave weird...
I've tried to animate the emitters speed, going fast for the 20 first frames (i'm in 120 fps), then back to 3...
It kinda work, but the splash is a bit too unreal, too explosive... If i reduce the starting speed, the water is again falling too fast...

Plus, my simulation stopped at frame 270... so i resumed it, from 270... but when i play the preview, there is a mini-stop-start effect, with particules going in all directions...

I'm kinda stuck here...

My feeling tells me that Hybrido would be better for heavy scenes like this one (now my emitters are at resolution 100)... But i'm not sure how to make it work well...

Could anyone take my obj files and help me on this one ?

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Oldcode
Posts: 170
Joined: Fri Nov 04, 2011 12:35 am

Re: flush

Post by Oldcode » Thu Jun 19, 2014 1:56 pm

Hi,

If you could post some pictures of your geometry, that would help, but from what I've read, there's a couple of things I'd try.

1. Decrease the gravity. The defualt is -9.8. You could try going down to -5 or even -1 and see if the water drains more slowly.

2. A Corialis or Vortex Demoan might get you more of the circlular movement you've looking for.

Good Luck,

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