Direct Numerical Simulation of Flow Around a High-Temperature Cylinder Near a Wall Boundary Layer
This study employs direct numerical simulation to investigate the two-dimensional flow around a cylinder near a wall under both isothermal and non-isothermal conditions.Under laminar flow conditions,the effects of gap ratio G/D(where G is the distance between the cylinder's lower surface and the wall,and D is the cylinder diameter)and heat transfer on the flow field around the cylinder and the forces exerted on the cylinder are discussed.For G/D=0.5,the vortex shedding from the cylinder's lower surface is suppressed by the wall boundary layer,forming a larger recirculation zone on the wall.For G/D=1.0,the recirculation zone on the wall decreases,and vortex shedding occurs from the cylinder's lower surface.For G/D=3.0,the flow is similar to that around a cylinder without wall confinement.When the cylinder's temperature is higher than the fluid's temperature,the average lift coefficient decreases,while the amplitude of drag oscillation increases.
cylinder flowboundary layervortex sheddingdrag forceheat transfer
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