Fields of flow can be used to represent a variety of spaces. For example:
This field is composed of Streamlines that represent a homogeneous nonviscous flow.
This field of flow represents uniform rotational flow.
This field of flow represents a vortex.
This field of flow represents flow from a linear source. Note that this can be through multiple mediums: fluids, heat, or electrostatics.
This field of flow represents linear dipole flow. You may recognize it as the electric field of two oppositely charged wires.