#NAME?

Abstract

In this work, two-dimensional unsteady incompressible flow of non-Newtonian power-law fluids across a long circular bluff body confined symmetrically between infinitely long two parallel plane walls is investigated numerically by solving the continuity and momentum equations using FLUENT. The numerical calculations are performed in the full computational domain for the following ranges: Reynolds number, Re = 50 — 150 and power-law index, n = 0.4 — 1.8 (covering both shear-thinning and shear-thickening behaviours) for the fixed blockage ratio of 0.25. To understand the flow dynamics, global characteristics such as drag and lift coefficients, Strouhal number and derived variables such as stream function, etc. are calculated for the above range of conditions. It is observed that the shear-thinning behaviour yields a lower value of the time-averaged drag coefficient than the corresponding Newtonian value; however, an opposite trend is observed in the shear-thickening behaviour. As the Reynolds number increases, Strouhal number increases for the fixed value of the power-law index; however, the Strouhal number decreases with increasing power-law index for the fixed value of the Reynolds -number.