System Units for ship in ocean sim

[gummipolarbear]

I wanted to know if anyone knows the difference when setting up System Unit scale from 1 Unit = 1.0 Meter and 1 Unit = 10.0 CM when running a ship in the ocean sim. I've been doing tutorials and have been seeing both kinds of units being used but not sure how it affects the simulation. I am doing high resolution renders and want the highest detail possible in the wake splashes and mist because I have close up shots of the bow and wake I wanted to render. Trying to figure out how to run the simulation to get the higher details when close up. Currently using 1 Unit = 1.0 Meter
Thanks!!!

[georgi.zhekov]

Hello,

The Phoenix Simulator works best when the scale of the container matches the real-world size of the simulated effect. For example, if you are simulating water pouring into a glass cup, the cup should be in a typical size range, such as 9-12cm tall and 8-9cm wide, while your container grid might be a bit larger.

Note that it does not matter if the units are displayed as two meters or two thousand millimeters - the way you view the units is irrelevant. Phoenix always converts the units to a common world-size length, so the only important thing is the size of the container. If you are simulating a large waterfall, for example, the container might be up to several hundred meters tall, or several hundred thousand millimeters.

The unit scale doesn't affect the quality of the simulation - it will only affect the way the liquid will behave. Using 1 Unit = 1.0 Meter for a ship simulation should be totally fine.

The quality of a simulation is determined by the Voxel size in the Grid rollout of the simulator - the smaller the voxel size, the higher the grid resolution will be, but note that this will consume more memory and will take longer to simulate.

You can see some examples of how different scale and grid resolution look like here - https://docs.chaos.com/display/PHX4MAX/Liquid+Grid

Cheers!