Like this:

This one deals with the relationship between the Vorticity and the Grid Spacing.

Quote from the FumeFX 1.2 help file:
Vorticity - This parameter is very useful for coarse grids, where simulations lack detail.  When you increase grid detail then the need for vorticity is lowered, since the simulation itself will result in more detail.  Higher vorticity will increase the number and strength of small vortices in the fluid.

Spacing - This parameter directly affects the detail level in your simulation.  Type in or use the spinner to set the spacing of the voxel-based grid.  The chosen value defines voxel size; smaller voxel size allows for more voxels in simulation, which produces greater detail.

@ Frame 40

@ Frame 80

Animation on Vimeo

Notes:

• It can be clearly seen that with very coarse grids (large values), adding Vorticity can drastically change the fluid.
• I also noticed that 0.5 Vorticity gives the highest simulation time, and 1.0 Vorticity the lowest. Here is a graph representing the time curve:

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