Single vortex ring

Initialises a single, vortex ring of size $R$.

Usage

struct SingleRing{A} <: InitCond
    Radius::A
end

Vortex ring in the $yz$-plane, propagating in the $x$ direction. Use the field Radius to set the radius of the vortex ring.

#Set an initial condition of ring size 1.0
IC = VortexFilament.SingleRing(1.0f0)