best practice for CFD simulation rendering

[fraggle]

That's definitively not the right value, even with 1600 discharge, with a 12.52 cm2 emitter.
Just try to run the 2 first frame with this value and you will right away notice that it is visually wrong. Your face will get as wet as your hand with such type of tape.

Hey,

Just dropping in on the math...

Your emitter area should be more like 12.57 cm^2.

If you are using the preset, you need to go to your Dynamics rollout and reset your unit scale to 1.0, because this gets automatically adjusted with the Tap Water preset.

So, with a discharge of 1600 (only if you are using Surface Force in your source) you should get 0.2L/s = 200cm^3/sec with an emitter that has an area of pi*2cm*2cm.

Hope this helps

[Raven]

The maths was still bugging me so I did some tests. Svetlin correct me if I'm wrong, but this seamed to work.

As far as I can figure the velocity setting is in cm/s (well for my scene anyway as my scene units are cm, I'm guessing it may actually be in scene units per second)
This makes sense to me, as it shouldn't be tied to grid or else you would need to change it every time you decide to increase/decrease your grid resolution.

So i figured to get 200 cm^3 volume you just divide by your area in cm^2 (3.14) and that gives the velocity in cm (63.69).

Using this method I created the following with 3 different emitters, aiming to fill 1 liter over 5 seconds.
I assume the slight variations in accuracy has to do with grid resolution (mine was set to 0.2 cm)

[fraggle]

Raven, from the info gathered from the chaos group doc, the velocity is in voxel/second or cell/s, not in cm/s.

If the formula exist, then Svetlin, as lead phoenix developer, is the only one able to give the true solution ....... if he wish it.

Your test use a logical approach that could be the right one but who really knows?
Thanks anyway to drag the problem so deeply.

[fraggle]

will be great to get the final on that.

If the formula exist, then Svetlin, as lead phoenix developer, is the only one able to give the true solution ....... if he wish it.

[fraggle]

Hello,
can I get an official answer on this matter?
Thanks

will be great to get the final on that.

[Svetlin.Nikolov]

Hey,

I believe we've already exhausted the topic. If the scene still does not behave the way you expect it to, the best possible approach would be to send it over to Support and we'll adjust it for you. This would be especially useful when scenes are under NDA.

Thanks!

[fraggle]

Hey,

I believe we've already exhausted the topic. If the scene still does not behave the way you expect it to, the best possible approach would be to send it over to Support and we'll adjust it for you. This would be especially useful when scenes are under NDA.

Thanks!

Thanks Svetlin,
Exhausted is not really the term that fit the best. The topic was simple: How to convert cell per second unit into liter per second unit.
The value, you gently indicated, is not working, so I keep asking...for the benefit of all chaos group users.
On top of all, Phoenix is better than all CFD (your word not mine), i wonder why this information cannot simply be share to all users and benefit to all chaosgroup users.

[Svetlin.Nikolov]

If the formula is not working, the only thing that can help solve it is to have a look at the scene and see where the difference comes from.

[JuhaHo]

I'm currently working on a project where Ansys simulation is available. Has there been any development for using the simulation results in Max since then.

[Svetlin.Nikolov]

Negative, this hasn't been a topic of much interest for a long while now...