Is this possible in Phoenix

[Raven]

Hi

We are looking at doing some under water bubble sims.
Was wondering on which direction we should take.
Is this sort of thing possible with Phoenix?
https://vimeo.com/10772406

Thanks

[Ivaylo Katev]

with a very simple low res test i got this
just an air source under the water. there is a small cheat, to avoid the huge conservation value needed to prevent smashing of the bubbles by the much heavier water, i have set the liquid density to be only 10 times than the air density. the real value is about 1000. this makes possible to work with conservation only 200
the liquid density control is a hidden parameter called "lqdens"
use $.lqdens=10 to set the value

[Raven]

Wow, thanks Ivaylo.
Look like Phoenix may be able to do what we require.

[Raven]

Hey Ivaylo

So I just saw this
https://vimeo.com/groups/pflow/videos/110725200
and was wondering if it could be done in a similar way with Phoenix
Looks like you could control the bubbles more.

[Raven]

Have tried setting the liquid density to 0.1. Seams I have to have strong surface mode on or it lasts only 2 frames.
Not sure if this would be the correct approach.

[Ivaylo Katev]

Hey Ivaylo

So I just saw this
https://vimeo.com/groups/pflow/videos/110725200
and was wondering if it could be done in a similar way with Phoenix
Looks like you could control the bubbles more.

this is a simple smoke simulation rendered as mesh. unlike our simulation, there is no liquid surface above.
the liquid density must be above 1, in the perfect case it must be the original one, but this is not acceptable due to the high conservation requirements.

[stevesideas]

Is there a way to have more stable bubbles without as much turbulence and breakup?

[Svetlin.Nikolov]

Hey, can you share your dynamics settings? A guess would be that you need to zero all randomization and vorticity, and maybe use the BackTrace advection method.