  A large eddy simulation (LES) with an extended Smagorinsky model has been
carried to investigate numerically the fully developed turbulent flow of a
shear thinning fluid (n=0.75) in a stationary pipe at a simulation's Reynolds
number equals to 4000 with a grid resolution of 65 3 gridpoints in axial,
radial and circumferential directions and a domain length of 20R. The present
study set out to critically evaluate the influence of the Non-Newtonian
rheological and hydrodynamic behaviour on the turbulence main features, as well
as to ascertain the accuracy and reliability of the laboratory code predicted
results. The turbulent flow statistics obtained compared reasonably well with
the experimental data and DNS results. A reasonably good agreement has been
obtained between the predicted results and available results of literature. The
main findings suggest that the mean axial velocity fluctuations were generated
in the wall vicinity and transferred to the radial and spanwise components,
which resulted in to an enhancement in the kinetic energy of turbulent
fluctuations along the radial direction. The energy transport from the axial
fluctuations to the other fluctuations components between the flow layers was
suppressed compared to that of the Newtonian fluid.
