Ship in Ocean

[waaazoo]

Hi momo1585,

Could you show us your Phoenix settings?
Did you create this model in Maya or is it imported?
If Phoenix produces strange simulation behaviour with your model, check the normals of your mesh.
The normals should face outwards, this way Phoenix sees your model as an obstacle.

And it's better if the Hull is a closed object.

[Brainwave]

Hi Waaazoo,

Yeah, forgot to mention a closed mesh will certainly help.

Interesting result, seems about the same i am getting with a 60M yacht at 18 knots.
I also have these blobs, seems to be a Flip solver thing.
Never had such behaviour with the older method.
Nevertheless, these results are better then i was getting with my old units setup.
My old setup was 1M display units and 1M system and that was always improper scale with Phoenix somehow.

Indeed, maybe the developers can guide us a bit on the issue?

[flipbook]

Those blobs are pretty much down to the resolution. Use your current resolution for general scale/pace testing then ramp it up. To get really nice rolling wave details off the bow then you are going to need 50+ million cells I think.

[Brainwave]

Hi Flipbook,

Thanks for your input, will ramp up the resolution to 50 Million cells and see what i get.

[waaazoo]

Those blobs are pretty much down to the resolution. Use your current resolution for general scale/pace testing then ramp it up. To get really nice rolling wave details off the bow then you are going to need 50+ million cells I think.

Here is a result with foam (meters, units scale 0.02) and cells of size 10
Not bad, what do you think?

https://vimeo.com/202372839

let me make the same test with double amount of cells to see what happens to the blobs (for whole ship I would certainly already be at 60M cells)

[momo1585]

it's strange why create a phoenix simulatore in a new scene i see the particle , otherwise i create a simulation with the ship i don't see anything.
The model is full modeld in maya the normal is ok ....
I don't konw !!! Please help

[Brainwave]

Hi Waaazoo,

Not bad at all, seems to head in the right direction.

[Brainwave]

Hi momo1585,

Give your ship a realistic speed and link the Phoenix simulator to your model.
Leave the foam and splash particles off, first focus on the simulation of the liquid.
What is the size of your Phoenix simulator?
With a ship of about 10 meters in length i would start with a simulator of about 50 meters long 20 meters wide and 5 meters high.
Place the front of the simulator near the bow of your ship, you don't have to simulate what's in front of the bow.
Adjust the resolution to about 7 million cells before you start a simulation to get a first impression of how your model reacts to the liquid.

[waaazoo]

Hi momo1585,

Give your ship a realistic speed and link the Phoenix simulator to your model.
Leave the foam and splash particles off, first focus on the simulation of the liquid.
What is the size of your Phoenix simulator?
With a ship of about 10 meters in length i would start with a simulator of about 50 meters long 20 meters wide and 5 meters high.
Place the front of the simulator near the bow of your ship, you don't have to simulate what's in front of the bow.
Adjust the resolution to about 7 million cells before you start a simulation to get a first impression of how your model reacts to the liquid.

and do not get confused by the grid settings... the Width, Length, Height settings are in number of cells that fit into the grid (it changes when you change the "Cell Size").
The final simulator size is indicated in "Total Cells" with a factor of the Units Scale (all this is confusing!)

The best, is to draw a cube around your boat with the dimensions indicated by Brainwave (to get an idea), and play with the Units Scale and cell size

[waaazoo]

Svetlin,

When batch simulating, it seems that it takes into account what is in the time slider and/or range slider, rather than what is typed into the simulation "Start Frame" and "Stop Frame".
Example: Start Frame:0, Stop Frame:1500, Rangeslider 0 to 100.... when batch simulating it will calculate 100 frames.
Is that the behavior you expect ?

[waaazoo]

Those blobs are pretty much down to the resolution. Use your current resolution for general scale/pace testing then ramp it up. To get really nice rolling wave details off the bow then you are going to need 50+ million cells I think.

Here is a result with foam (meters, units scale 0.02) and cells of size 8
I think I prefer the previous one with cells at 10 (for now, also because it simulates much faster ).

https://vimeo.com/202386287

[flipbook]

Yep, prefer the other one

You've got me starting a large ship scene from scratch now I've taken the ship from the example file but starting at with a default blank scene etc. As you can see from the image I'm only sim'in the bow at the moment. Need to get more splash birth at the front

https://www.dropbox.com/s/krfqlre0z3...P_v1_.JPG?dl=0

[waaazoo]

Yep, prefer the other one

You've got me starting a large ship scene from scratch now I've taken the ship from the example file but starting at with a default blank scene etc. As you can see from the image I'm only sim'in the bow at the moment. Need to get more splash birth at the front

https://www.dropbox.com/s/krfqlre0z3...P_v1_.JPG?dl=0

I would say that you have a too dense foam. Look at the reference pictures, you don't have necessarily so much splashes and foam. Of course it depends highly on the boat speed and on the hull shape.

[flipbook]

yes the foam is too dense outside the grid, final one wont be like that :P

What settings have you got for your splash by the way?

[waaazoo]

attached are the Splash and Foam settings I have currently.
In my last test I reduced the Velocity Mult. to 0.5, so the splashes don't jump to far around. I have the feeling that it will be better.