Simulation of Non-Newtonian shear flow over a circular cylinder

In this study, shear flow over a circular cylinder has been investigated numerically using lattice Boltzmann method. Non-Newtonian behavior of fluid has been considered using power law model for non-Newtonian fluids. In particular, the effects of power law index (0.4≤n≤1.8) and shear rate (0≤SR≤0.2) on vortex pattern and flow induced forces parameters at a fixed Reynolds number (Re=100) are presented in detail. Results show thatthe vortex-shedding frequency significantly decreases with increasing the power-law index.Shear rate also plays the same role and reduces the Strouhal number as it grows. This effect becomes more evident as the shear rate gets bigger.

Keywords:

Multiple-relaxation-time Lattice Boltzmann method , Power-law fluids , Drag coefficient , Lift coefficient , Shear circular cylinder