Viscosity simulation in the method of discrete vortices

In the method of discrete vortices a fluid flow is simulated by motion of inviscid vortex elements. As a result of difference discretization of the motion equations the scheme dissipation appears that leads to variation of the vortex motion invariants in numerical simulation. On the other hand, viscosity also leads to variation of the invariants in time. The suggested method takes the viscosity into account by correcting results of the numerical simulation of the motion equations. The correction form is determined by the requirement, that variations of the motion invariants have to coincide with the variations generated by the given viscosity. Numerical computations have been performed for the von Karman vortex streets behind a plate in the Reynolds number range 50 less than or equal to Re less than or equal to 2000. A good agreement with experiment is obtained.