Hello,
i need to create a toilet flush simulation with Phoenix FD.
Any advices or ideas ?
i suppose you have to use negative source at the toilet’s output
I have try with a cylinder as sources + a vortex to make water rotating , but it’s not good at all .
It’s the first time i read NEGATIVE SOURCE !! what’s that ?
negatiwe source is just a source with negative discharge, it sucks ( literally 
)
oh that’s a better source for sure 
now, how to have the natural whirlpool without using vortex wich suck ?
Wow !! i’ve never try negative discharge before and this is very handy !
Many thanks for your precious help Ivaylo !!
i suppose the whirlpool will arise naturally, without the help of the vortex force, or it does not occur?
it’s does not occur.
So, maybe my parameters are wrong choices ?
objects voxels :
centers
conservation method :
symmetric
30
uniform density not checked
advection classic
step per frame 2
dynamics:
initial force checked
standard gravity 0.924
never tried to make natural vortex, can’t say which settings are important. the situation is more complicated by the fact that not any drain produces a vortex. i suggest to use the vortex force to make it, don’t waste your time to find natural vortex conditions.