Liquid lines?

[rporter8555]

Greetings,
I am using 2.25.01 Nightly Build 1601236602 from 23 January, with Max 2016 and V-Ray 3.30.03.
Ship model is to scale, 512 feet long by 51 feet wide, waterline at 16 feet above keel. Using ship hull proxy for sim while I model the ship superstructure.
Grid size is Y=869 feet, x=150 feet, z=16 feet, cell size 4.5 inch, total cells about 40 million, initial fill 50%. This puts about 8 feet of water in the simulation. The bow wakes dissipate pretty well by the time they hit the side of the sim.
Splashes, mist and foam look good so far. Ocean texture is great, angle zero to Y axis matching ship/sim movement, so ship is straight into the wind and seas. Speed of the ship and sim (sim is linked to ship hull for movement) is such that it takes about 310 frames - ten seconds - for the animation to travel one ship length and 510 frames to travel the sim length. Cache file size about 186mb each frame. Cache file content: Liquid 17.6M, Foam 610K, Splashes 59K, Mist 113K. No wetmap. Sim developed in one pass, not by resimulation.

I am finding that as the bow wake spreads out across the width of the sim grid, something resembling grid lines is appearing in closeup shots. Is this normal?
Below: frame 110



frame 188


Below is bow closeup at frame 138 showing the bow wake spread, which is amazing.



Any comments for improvement and how to clean up the "grid" lines?
Thanks in advance,
Ron Porter

[Ivaylo Katev]

the lines are something new, can you render without displacement to see them clear?

[rporter8555]

Here it is, frame 188 with and without displacement. Noticing a few artifacts at the edge of the sim which are pretty well hidden with displacement on.
Ron

[Ivaylo Katev]

hm, no idea, can you try with the attached scene? this is the ship sample reworked for flip solver

[rporter8555]

Thanks Ivaylo! I'll give it a try.
Ron

[rporter8555]

Increasing my grid resolution seems to have fixed the problem. Thanks for your help!
Ron

[Ivaylo Katev]

i suppose this is the transition from ordered to chaotic particles. in the early development stages, the liquid was produced chaotic in all cases, i mean sources, initial fill up, the incoming liquid of the leading face of the grid, and all other processes involving new liquid creation. however this was problematic, because requires incredible resolution to make the liquid surface smooth, so we reworked the concept and now all the liquid creation except the inject mode sources are producing ordered particles. in the moving container the particles are produced ordered on the leading face, but with the time they become slowly chaotic, that probably produces the lines, when a certain point becomes chaotic the liquid movement draws a line. good to know that higher resolution helps, perhaps we will answer this question multiple times.