Can someone explain how viscosity and variable viscosity works

[lukepenry]

I have been using phoenix a while, and always gotten result but i don't think i fully understood how.

I don't understand the difference between the Default viscosity in the dynamics rollout and viscosity in the Liquid source. I can never seem to get a really thick viscosity like in the demos.

Also how can i map variable viscosity into this? i have read the help but i don't fully understand it.

Sorry for the noob questions.

Cheers!

[slavina.nikolova]

Hey,

The Default Viscosity affects the whole Simulator, but the Viscosity in the Source effects only the emitted fluid. So you could have one Viscosity for the whole simulation and another specifically for the emitted liquid. The Source Viscosity gives you the opportunity to have a couple of Sources with different Viscosity.

The Viscosity strength is connected to the Scene Scale and the Steps Per Frame - in order to achieve "stronger" Viscosity, you should consider increasing the Scene Scale and the Steps Per Frame values. But be aware that the Scene Scale affects the fluid behavior and the Steps Per Frame are increasing the simulation time, so you should balance between them.
It's important to mention that if you increase the Grid Resolution, the Viscosity will become "weaker", but you could keep the balance by adjusting the Scene Scale and the SPF values.

To combine both types of Viscosity you should enable the Particle and Grid Viscosity Channels from the Output rollout.


Hope this helps!

[lukepenry]

Thank you i will try this!