Numerical solution of longitudinal and torsional oscillations of cylinder with suction in a couple stress fluid

The flow of a couple stress fluid generated by performing longitudinal and torsional oscillations of a porous circular cylinder subjected to constant suction at the surface of the cylinder is studied. A finite difference method is proposed to analyse the velocity components, in an infinite expanse of an incompressible couple stress fluid under vanishing couple stresses of type A condition or super adherence condition of type B on the boundary. The effects of couple stress parameter, Reynolds number and the ratio of couple stress viscosities parameter on transverse and axial velocity components are studied. The drag force acting on the wall of the cylinder is derived and effects of Couple stress parameters on drag are shown graphically.