Domain World Settings

Ryan Guy edited this page Jan 31, 2019 · 6 revisions

This page documents the domain settings for the 'FLIP Fluid World' panel.

Parameters

All parameters in this panel must be set before baking for changes in the simulation to take effect.

World Size

Enable World Scaling Enable the domain to be scaled to a real world size.
World Size Scale the domain size to this value in meters. The longest side of the domain bounding box will be scaled to fit this value. This setting is only active if Enable World Scaling is enabled.

Gravity

Gravity Mode The value of gravity that will be used in this simulation.
Scene
    Use the gravity vector defined in the Blender > Properties > Scene tab.
Custom
    Use a custom defined gravity vector.
Gravity Gravity vector value to use if Gravity Mode is set to Custom.

Viscosity

Enable Viscosity Enable the viscosity solver.
Viscosity The value of viscosity to use in this simulation. A higher viscosity value relates to a 'thicker' fluid.
TIP: The visual 'thickness' of the fluid is dependant on the size of the simulation domain. For example, a viscosity value may appear 'thick' in a small domain size, but if the same value is used in a larger domain, the fluid may appear visually 'thin'.
NOTE: The viscosity value does not correspond to any real-life physical quantity. It is just a number that specifies the amount of viscosity.

Surface Tension

Enable Surface Tension Enabled the surface tension solver. Surface tensions forces help create realistic small-scale effects by simulating the natural cohesion of surface molecules that cause fluids to form into beads, drip, and add an elastic look to splashes.
TIP: Fluid sheeting in combination with surface tension can help create beautiful splashing effects!
NOTE: The visual amount of tension on the fluid is dependant on the size of the simulation domain. For example, a surface tension value may appear large in a small domain size, but if the same value is used in a larger domain, the fluid may appear with a visually low amount of surface tension.
NOTE: The surface tension value does not correspond to any real-life physical quantity. It is just a number that specifies the amount of surface tension.
Accuracy Amount of accuracy when calculating surface tension. Increasing accuracy will produce more accurate simulation results and can help eliminating surface 'oscillation' artifacts but will require more simulation substeps which will lead to longer baking times.
Stability Increasing this value may improve stability and reduce odd simulation behaviour, but will reduce detail of fluid motion. This is a parameter for development and testing purposes and will be removed in the future.
TIP: High surface tension simulations may be vulnerable to instabilities. This value may need to be raised for these types of simulations.
Estimated Substeps (Info) Displays the estimated number of substeps per frame that the simulator will run in order to keep simulation stable during surface tension computation. This number will depend on domain resolution and size, framerate, amount of surface tension, and surface tension accuracy.

Sheeting Effects

Enable Sheeting Effects Enables sheeting/gap-filling feature. Fluid sheeting fills in gaps between particles to help preserve this fluid sheets and splashes.
TIP: Fluid sheeting in combination with surface tension can help create beautiful splashing effects!
Sheeting Strength The rate at which new sheeting particles are added. A higher value will add sheeting particles more often and fill in gaps more quickly.
Sheeting Thickness How thick to fill in gaps.
TIP: Using a thickness that is too low may reduce how well the simulator is able to fill in gaps. Values less than 0.05 are not recommended.

Boundary Friction

Friction Amount of friction on the domain boundary walls.
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