Coupled fluid-structure interactions of natural convection in a ferrofluid using ISPH method

Abstract

This study aims to use incompressible version of smoothed particle hydrodynamics (ISPH) method for simulating natural convection flow of hot sloshing baffle inside a ferrofluid-filled cavity including the motion of cold circular cylinder. ISPH method is developed by using kernel renormalization function for the boundary treatment. The solid vertical baffle is carrying a hot temperature Th and it is sloshing inside a cavity under a resonance sway excitation. The motion of solid circular cylinder is treated as a rigid body motion by ISPH method. The horizontal cavity walls are adiabatic and both of vertical cavity walls and inner circular cylinder have a cool temperature Tc. The source of the external variable magnetic field is positioned near to the middle of the left cavity wall. The partial governing equations with adjacent boundaries and rigid body motion were solved numerically using ISPH method. The control physical parameters are a wave amplitude A, baffle height Hb, nanoparticle parameter ϕ and magnetic field parameter Mf. The results reveal that the active zone and rigid body movement inside a cavity are affected by the hot vertical baffle parameters. The amplitude and baffle height promote the fluid circulation to enhance the heat transfer inside a cavity. The average Nusselt number on both of hot vertical baffle and left cavity wall decreases as the amplitude A increases from 0.1 to 0.3 and it increases as the vertical baffle height increases. Adding nanoparticles concentration augments the ferrofluid viscosity and then the strength of the ferrofluid flow is reduced.