Double-click Fluid Surface to add it to the scene or mechanism.
Configure the following fields in the Properties panel.
Fluid Density: Sets the density of the fluid (in kg/m3).
Fluid Velocity: Sets the velocity of the fluid along the three axes (in m/s).
Fluid Elevation: Sets the elevation of the fluid (in meters).
Fluid Surface Type: There are two types of fluid surfaces you can select:
Planar: The planar surface is defined by a plane along the gravity axis; useful for creating an ocean or wind.
Mesh UV Grid: Selecting this option reveals another field, Collision Geometry, where you can select a collision geometry. Its triangle mesh defines the fluid surface; useful for creating lakes or rivers.