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If you don't already have a part that contains the buoyancy geometry, follow the procedure in Creating Parts and Geometries Manually.
The center of buoyancy refers to the point through which the buoyancy force acts. Vortex® calculates the center of buoyancy from the centroid of the displaced fluid.
The center of buoyancy is given in the local frame of the geometry. By default, its three coordinates are (0,0,0), which coincides with the center of the geometry.
The displaced volume is the volume of fluid displaced by the collision geometry when it is wholly immersed. For instance, if the collision geometry has a hole, its displaced volume is the volume of the geometry minus the hole's volume.
For more information about setting buoyancy in the SDK, see Buoyancy Force.