Computational study on torsional Casson fluid flow through concentric cylinders in a porous medium

The aim of this article is to gain a better knowledge of the non-Newtonian features of Casson fluid flow under torsional motion through two concentric cylinders in a porous medium. This study is crucial because it has the ability to control the flow characteristics of Casson fluids in porous media using rotating cylinders for the optimization of industrial processes. The flow-narrating differential equations are converted into a set of nonlinear differential equations. To obtain numerical results to flow problem, a computational model is developed. Numerical solutions are acquired employing the fourth-order exactness programme (Bvp4c), and findings are validated by comparing them to the Runge-Kutta fourth-order approach. Consequences of various distinct parameters for fluid flow and heat transfer are interpreted in graphical and tabular form. It is found that both fluid velocity and temperature increase with growing inputs of outer angular velocity (0.3 <= Q 2 <= 0.9). Skin friction coefficient (Cf s root ) is observed to decline in the case when both cylinders are rotating in same direction (Q 1 = 0.7 and Q 2 = 0.7) with enhanced inputs of Hartmann number (0.5 <= Ha <= 2.0), while Nusselt number (Nus) profiles are enhanced with rising inputs of the Forchheimer parameter (0.2 <= Fr <= 0.8) when both cylinders are rotating in opposite direction (Q 1 = 0.7 and Q 2 <= - 0.7).