Toilet flush Simulation

[ghiom3d]

Hello,

i need to create a toilet flush simulation with Phoenix FD.
Any advices or ideas ?

[Ivaylo Katev]

i suppose you have to use negative source at the toilet's output

[ghiom3d]

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 ?

[Ivaylo Katev]

negatiwe source is just a source with negative discharge, it sucks ( literally )

[ghiom3d]

oh that's a better source for sure
now, how to have the natural whirlpool without using vortex wich suck ?

[ghiom3d]

Wow !! i've never try negative discharge before and this is very handy !

Many thanks for your precious help Ivaylo !!

[Ivaylo Katev]

i suppose the whirlpool will arise naturally, without the help of the vortex force, or it does not occur?

[ghiom3d]

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

[Ivaylo Katev]

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.