Unsteady MHD flow near a rotating porous disk with uniform suction or injection

This is the authors' abstract. We don't add key points for this paper.

In this paper, the MHD flow of an incompressible, viscous and electrically conducting fluid above an infinite rotating porous disk is extended to flow starting impulsively from rest. The fluid is subjected to an external uniform magnetic field perpendicular to the plane of the disk. The effects of uniform suction or injection through the disk on the unsteady MHD flow are also considered. The governing nonlinear partial differential equations are solved numerically using the finite-difference approximations with a special treatment of the discontinuity between the initial and boundary conditions. The results of the numerical solution indicate some interesting effects of the magnetic field and the suction or injection velocities on the flow and prove that the steady state can be reached via a time-dependent process.