size of emitters (especially for liquids)

[jay_vortex]

Hi everyone,

Where a waterplay company and where currently trying out phoenix FD for our liquid simulations. So far it look really promising.

But here the problem. Our water features product, some of them have really small holes where the water comes out, like 0'0 3/32".

In this case the effect is really simple its just a water jet that comes out of the hole.

But since its so small its seem we need to really crank up the cells resolution to actually see something from a small emitter like that.

Problem is its too long and heavy to simulate, and we have big PC here already.

Sorry for the long post, but its an important step in our buying decisions!

Thx a lot.

Jay.

[Ivaylo Katev]

this is really a hard situation, looks like the huge resolution is the only possibility. i have a suggestion, but do not have too big expectations. the idea is to try with two simulators connected in serial way, the first one with very fine resolution and small volume (only for the jet), and the second one with coarse resolution and big volume. if you set the liquid of the fine simulator as source in the coarse one, there is a chance to achieve the desired result. the fine simulator starts first (set it to export the velocity!) and when is ready start the second one, using as source the fine simulator. set the discharge of the phoenix-source to a very small value, the velocity channel plays its role.

Regards,
Ivo

[jay_vortex]

Hi Ivo,

thx for your reply. Im afraid i dont know how to connect the two simulators together...?

What i did so far is this:


1- I created the small simulator with fine resolution in a small volume just around the emitter for the begining of the jet.

2-In output i set export the velocity.

3- I created the second simulator by duplicating the first one then put it bigger and with less resolution in the grid's cells.

Do i need two phoenix sources? I know i can pick a simulator as source but it does'nt seem to work. Is there a tutorial for that somewhere maybe?

**update** Basically want i dont understand is how you set the liquid of the fine simulator as source in the coarse one

Thx a lot.

Jay

[Ivaylo Katev]

anyway, it would be good to include such example in the package, so i will try to create some today.

[Ivaylo Katev]

well, i just made a fast test, the result is even better than i expected, however there is a rendering problem that i have no idea how to avoid. as seen in the image, the surface of the first liquid is clearly visible in the second one, despite the fact that they are using the same material.

here is the preview of the scene:

[Paul Oblomov]

Very smart! Never thought it can be used that way

[jay_vortex]

Hi Ivo,

thanx for the explanation!

I tried it this way and its a bit better but still not good enough i think. :/ For what we need to do it may be a bit counter productive.

But still, pretty cool techniques in other situations!

Thx.

PS: i private msg you right now.

Jay.