Variable Density Solver

[Pazuzu]

Hi!!!

It's possible to build a solver (with the provided microsolvers) that take into account density as a variable, for example to push a fluid with less density, with a fluid with high density?

Thanks.

Edited November 29, 2010 by Pazuzu

[Macha]

I have attached a file that extracts density from a flip fluid by calculating the particle density within it. (For practical purposes a fluid should have constant density unless you're deepdiving in Jupiter or sailing on a neutron star, but it works for particle sims)

What I don't know is how to attach this data. Perhaps a dops master can help us?

I'm sure that copy node is unnecessary but I don't know how to do it properly.

dunno.hip

Edited November 30, 2010 by Macha

[Pazuzu]

Thanks Macha for the example!!!

I mean with variable density, if it's possible with microsolvers one of the new features of Fume FX 2.1: http://www.afterworks.com/FumeFX/Simulation.asp?ID=4

[Macha]

Oh I see. Well, I don't know fume, but you can build any kind of field you wish. Pyro has quite a few by default although I still quite don't understand how to add new ones as you can see in my posted example from before.

Edited November 30, 2010 by Macha

[Peter Quint]

I'm not a fume user either - but reading the description I think fume has added what DOPs has had all along - the ability to take account of density when applying forces, so that for example lighter (less dense) smoke is affected more by a force than heavier (more dense) smoke. DOPs already does that.

[bunker]

Yes, that's what the "force scale" does, and it's mapped on density by default.

On the Pyro solver, it's in Simulation/Forces/Force Scale Source.

[bunker]

Hey Macha, I found a way of using your density attribute, have a look:

dunno2.hip

I have attached a file that extracts density from a flip fluid by calculating the particle density within it. (For practical purposes a fluid should have constant density unless you're deepdiving in Jupiter or sailing on a neutron star, but it works for particle sims)

What I don't know is how to attach this data. Perhaps a dops master can help us?

I'm sure that copy node is unnecessary but I don't know how to do it properly.

[Pazuzu]

Thanks to all of you for the explanations.

Edited November 30, 2010 by Pazuzu