This article is an attempt to enhance the heat transfer rate around anobstacle by nanofluids and controlthe instabilities of the unsteady flow by Magnetohydrodynamics. The finite volume method (FVM) is used to simulate the AL2O3-water nanofluid flow around a triangular obstacle. An external magnetic field is used to study the effects of magnetic field on fluid flow and heat transfer. The range of Stuart number and solid volume fraction of nanoparticles are 0-10 and 0- 0.05, respectively. Also, the Reynolds number is fixed at Re=100. The effects of above parameters on the flow and heat transfer characteristics are investigated. The obtained results indicate that a stronger magnetic field is needed for vanishingthe recirculation wake and stabilizing the flow in nanofluid comparing with the clear fluid. Also, the effect of magnetic field on reduction of heat transfer increases with increase in solid volume fractions.

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