Noisy and flickering water

[nikand]

I always find myself strugggling for hours with water simulation in phoenixFD. The problem is always flickering and noisy water surface. Is it even possible to make a stable watersim in a 1x1x1m(scene scale 2) container? I've sized it up to 5x5x5m(scene scale 1) with 27m cells and 20 steps pr frame. Surface tension 0,1.
Unfortunenately when I slow it down the flicker is very noticeable. I've done +50 scenes with phoenixFD in the past and I still struggle to get liquid stable, it can be very frustrating at times.
Any pointers to get stable liquid would be welcome.

I'm using the Nightlies_28250 version.

[georgi.zhekov]

Hey,
Generally, increasing the scene scale should help. Can you show us how your scene looks?

[George Barzinski]

Would you please attach a simple scene to see what's the specific problem because 'flickering' could mean a lot of things.

[nikand]

It's when the water droplets detaches or unites it has this unstable flickering movement(not smooth).

I get "invalid file" when uploading video here.
I'll send a mail to support.

[George Barzinski]

Unstable flickering... could be from Isosurface parameter but not sure. I'll check the scene. Tip: If you zip the scene you'll be able to attach it here

[George Barzinski]

Hi again. So, you can try with this or other values:

- Isosurface Level 0.2. You can read more about this option here: https://docs.chaosgroup.com/display/...quid+Rendering
- Smoothness 9 and Particle size 0.5.

These are render-time parameters, so no further simulation is required. This means that every change of the parameters should be seen immediately.

Also, check the Dynamics --> Wetting --> Sticky Effect. Maybe a little bit of Sticky Effect would give you more natural-looking fluid. I mean now it acts more like mercury or molten plumbum and slides on the bottom of the grid without any friction. This effect (and not only this) creates holes in the liquid and tears the mesh apart. I think this behavior will be reduced with some Stickiness unless of course, it's the desired look you're looking for.

[Svetlin.Nikolov]

Just a note - the Sticky Effect will work only if there is at least a little viscosity. Also, watch out for the Consumed Liquid parameter - it will make liquid particles disappear in the wetmap

[nikand]

George and Svetlin, many thanks for the pointers. I will do further testing soon and get back to you