Near-wake effects of a heat input on the vortex-shedding mechanism

Direct Numerical Simulation of the turbulent wake behind a heated cylinder

“…The asymmetry in the wake of the cylinder is also characterized by a lower shear-layer stretched in the direction of the cross-flow and vortices developing in the upper part of the flow with a dipole-like vorticity structure. This organization in dipole structures has been clearly identified by several authors in the literature: Biswas andSarkar (2009) in air andRindt (2003), Kieft et al (1999Kieft et al ( , 2002Kieft et al ( , 2007 for water, in the Ri < 2 and Re < 200 ranges. For higher Richardson numbers buoyancy becomes predominant and the wake ends up as thermal plume.…”

“…Moreover, typical mushroom-like structures are found in the wake of the cylinder (Fig. 10); they are also observed in pure natural convection flows such as pure thermal plume (Pham et al, 2006) and have been apprehended experimentally and numerically for laminar regimes (Kieft et al, 2002(Kieft et al, , 2007. In the latter, they grow under a diffusion process and remain recognizable even several diameters down the cylinder.…”

Unsteady wake dynamics and heat transfer in forced and mixed convection past a circular cylinder in cross flow for high Prandtl numbers

“…Another investigation by Kieft et al [13] described the vortex shedding process in cross flow past a circular cylinder for a Reynolds number of 75 and a Grashof number range between 0 and 5000. They reported that the strength of the vortices shed from the upper half of the cylinder is stronger than those of lower half.…”

Effect of cross-stream buoyancy and rotation on the free-stream flow and heat transfer across a cylinder

“…Here, for steady flow across a stationary cylinder under the effect of cross-stream buoyancy at Re ¼ 40 and Ri ¼ 0.25, the present average Nusselt number value of 3.242 compares reasonably with the value of 3.49 [7] and 3.481 [8] obtained on a grid coarser than the present grid size. Furthermore, in the unsteady flow regime, the present streamline plot and U-velocity profile along the cylinder vertical center line are compared with that of Kieft et al [31], at Re ¼ 75, with water as working fluid. Fig.…”