Influence of non-uniform magnetic field on Fe3O4-water ferrofluid flow in a porous cavity is simulated. Shape factor effect on nanofluid properties is taken into consideration. Vorticity stream function formulation is reported. The solutions of final equations are obtained using CVFEM. Figures are depicted for different values of radiation parameter (Rd), Darcy number (Da), Fe3O4-water volume fraction (phi) Rayleigh (Ra) and Hartmann (Ha) numbers. Results show that augmenting in Hartmann number leads to decrease in velocity of nanofluid and heat transfer rate. Utilizing Platelet shaped nanoparticles results the highest Nusselt number. (C) 2017 Elsevier Ltd. All rights reserved.