  An exact analogy of electromagnetic fields and particles can be found in
mechanics of a turbulent ideal fluid with voids. The system is supposed to form
a fine dispersion of voids in the fluid. This microscopically discontinuous
medium is treated as a continuum. The turbulence is described in terms of the
Reynolds stresses. Perturbations of the homogeneous isotropic turbulence are
considered. For the high-energy low-pressure turbulence they are usually small.
This entails the linearization of the Reynolds equations. The latter appear to
be isomorphic to Maxwell's electromagnetic equations. The Lorentz gauge
expresses the slight effective compressibility of the medium. A particle can be
viewed as a cavity in the medium. A respective antiparticle is modeled with an
agglomerate of the medium's material. Microscopically, these correspond to some
nonlinear vortex formations in the "vortex sponge".
