Boundary conditions Casson fluids Finite Difference Method Finite difference method Finite-difference methods Fluid-flow Heat transfer Heat transfer analysis Homotopies Homotopy Perturbation method Homotopy perturbation method Incompressible flow Linear transformations Magnetic effects Magnetohydrodynamics Navier Stokes equations Navier-Stokes equation Navier-Stokes equations Non-linear differential equations Nonlinear differential equation Perturbation method Perturbation techniques Porous materials Porous plates Viscous flow