The classical point vortex model corresponding to the 2D incompressible Euler equation in vorticity form is the system of N ODES
{˙xi(t)=∑1≤i≠j≤NajK(xi(t),xj(t))xi(0)=x0i
where K(x,y):=−12π((x−y)2|x−y|2,−(x−y)1|x−y|2) is the Biot-Savart kernel.
It is evident from the RHS of equation ??? that the point vortices only have binary (i.e. pairwise) interactions. My question is the following: are there physically motivated models generalizing equation ??? which have binary and ternary interactions? By ternary, I have in mind a term of the form
∑1≤i≠j≠k≤Najak˜K(xi(t),xj(t),xk(t)),
where ˜K is an R2-valued map.