A steady-state example with no singularities comes from considering the flow along the lines of a Hopf fibration. Let r be a constant radius of the inner coil. One set of solutions is given by: ρ ρ ( x , y , z ) = 3 B r 2 + x 2 + y 2 + z 2 p ( x , y , z ) = − − A 2 B ( r 2 + x 2 + y 2 + z 2 ) 3 u ( x , y , z ) = A ( r 2 + x 2 + y 2 + z 2 ) 2 ( 2 ( − − r y + x z ) 2 ( r x + y z ) r 2 − − x 2 − − y 2 + z 2 ) g = 0 μ μ = 0