Liquid Grid

Expand – Opens a floating dialog that contains the selected rollout and automatically folds the command panel rollout.

Re-Center – Resets the position of the floating rollout.

? – Opens up the help documents for the Liquid Grid.

Scene Scale | scenescale – Specifies a multiplier for the original units of the scene. Phoenix works best when the container size is close to the real-world size of the desired effect. You can use this parameter to make the fluid solver see the container as bigger or smaller than it actually is in the scene, in case you cannot change the general scene units. Check the sizes shown in the Total Cells field - this is the size the fluid solver will use. These sizes will change as you change the Scene Scale and should be close to the real world size of the effect you are simulating. It does not matter how you view the units - in meters, centimeters, inches, etc. For example, a candle simulation can be 20 cm tall, or 0.2 m tall - it's the same.

Larger scale would make the fluid move more slowly because it needs to travel a greater distance, while smaller scale makes the fluid move faster and more chaotic. Compared to the effect of the Time Scale option in the Dynamics rollout, Time Scale makes everything slower and things continue to work in the same way (except that more simulation steps will inevitable make the fluid dissipate some velocity and detail). Scene Scale will affect some simulation parameters like gravity, cooling, burning, surface tension, the rate of birth of splashes and mist, and make them behave like this is a much larger or smaller effect. For more information on how changing the Scene Scale affects the simulation, see the Scene Scale example below.

Voxel Size | cellsz – The size of a single voxel, in scene units. For more information, see the Grid Resolution example below.

X, Y, Z | xc, yc, zc – The grid size in cells. The dimensions shown next to X, Y, Z are the grid sizes in the scene, multiplied by the Scene Scale parameter - these sizes show how the solver will see the grid box and you can use the Scene Scale to cheat the solver into simulating as if the grid box was larger or smaller. In case you want to see how big the container for the loaded cache is in the scene without accounting for the Scene Scale, see the Container Dimensions in the Simulation rollout.

Increase/Decrease resolution – Changes the resolution of the grid while maintaining its size. For more information, see the Grid Resolution example below.

X, Y, Z | x_bound, y_bound, z_bound – Select between different container wall conditions for the simulation grid.

Open – The fluid is allowed to leave the bounding box of the Simulator through this wall. If Fill Up for Ocean is enabled, the Wall is treated as if there is infinite liquid below the Initial Fill Up level.
Jammed(-) – The simulation behaves as if there is a solid boundary in the negative direction. When Adaptive is enabled, the grid will not expand in this direction.
Jammed(+) – The simulation behaves as if there is a solid boundary in the positive direction. When Adaptive is enabled, the grid will not expand in this direction.
Jammed Both – The simulation behaves as if there is a solid boundary in both directions. When Adaptive is enabled, the grid will not expand in this direction.
Wrap  – The left and right boundaries are connected (toroidal topology). E.g. Fluid leaving the Simulator from the +X wall will enter it again from the -X wall.

Confine Geom | usegridgizmo, gridgizmo – You can specify a closed geometry object with normals pointing outwards, and the simulation will run only inside this object. The rest of the cells will be frozen as if a solid body was covering them. This way you can fill irregular shapes with liquid, or generally speed up your simulation by chopping off empty cells when you have an irregular fluid shape, e.g. a rocket launch.

Cascade Simulator | usecascade, cascade  – Specifies the source LiquidSim to connect this Simulator to, forming a cascading simulation. This allows you to join several Simulators into a structure with a complex shape. This can help you reduce memory usage by using many smaller Simulators in place of a single large Simulator. For more information, see the Connecting Two Simulators in a Cascade Setup section on the Tips and Tricks page.

Adaptive Grid | adaptive – The grid will resize automatically during the simulation in order to prevent the liquid from leaving the bounds of the Simulator box. Note that only the Open Container Walls will expand and contract when Adaptive Grid is enabled.

Adapt By | adaptby – Specifies the particle system that will be used for the grid adaptation. More than one particle system can be used by using a comma to separate the different systems. For example Liquid,Foam will resize the grid based on the movement of both the liquid and the foam particle systems. Available systems are Liquid, Foam, Splash, Mist, Wetmap. Make sure to enable Particle Velocity from the Output rollout for all particle systems you want to use for the adaptive grid.

Extra Margin | adapt_margin – Specifies the number of cells between the end of the grid and the active zone. You can use this to give the fluid a bit more room if the adaptive grid can't keep up with the simulation.

No Smaller Than Initial Grid | nbigrid – When enabled, the Adaptive Grid can't contract to a smaller size than what is given as the initial X,Y,Z size for the Simulator. Note that this way the initial grid box is always included, even if the fluid has moved farther from it. If this option is disabled, the grid will always encompass only the active fluid and will move together with it if needed.

Expand and Don't Shrink | onlyexpand – When enabled the Adaptive Grid will expand without shrinking. 

Maximum expansion | maxexp, expx/y/z/neg/pos – Specifies maximum growth sizes for each side of the grid, in cells. Using this, you can stop the expansion in certain directions.

Shrink to View | usegridfitcamera, grid_fit_camera – Species a camera whose frustum will be used to determine the maximum expansion. The Adaptive Grid will not resize beyond the frustum.