Blood's non-Newtonian behaviour is investigated in an idealized coronary 3D bypass model, which includes both the proximal and distal parts of the occluded native artery and the connected end-to- side bypass graft. Considering the blood to be a generalized Newtonian fluid, the shear-dependent viscosity is given by two well-known macroscopic non-Newtonian models (the Carrea-Yasuda model and the modified Cross model). Both non-Newtonian steady flow fields are analyzed with regard to the bypass geometry and are compared with the case of the Newtonian fluid. In order to perform all numerical simulations, we developed an incompressible Navier.Stokes solver based on the pseudo-compressibility approach and on the cell-centred finite volume formulation of the central explicit fourth-stage Runge-Kutta time stepping scheme defined on unstructured hexahedral computational grid. and Obsahuje seznam literatury