  The article is devoted to the simulation of viscous incompressible turbulent
fluid flow based on solving the Reynolds averaged Navier-Stokes (RANS)
equations with different k-omega models. The isogeometrical approach is used
for the discretization based on the Galerkin method. Primary goal of using
isogeometric analysis is to be always geometrically exact, independent of the
discretization, and to avoid a time-consuming generation of meshes of
computational domains. For higher Reynolds numbers, we use stabilization SUPG
technique in equations for k and omega. The solutions are compared with the
standard benchmark example of turbulent flow over a backward facing step.
