Publication Type:

Journal Article

Source:

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, Volume 230, Issue 7, p.1224-1239 (2016)

URL:

https://journals.sagepub.com/doi/abs/10.1177/0954410015606166

Keywords:

drag reduction, hybrid finite element–finite volume method, Mixed convection, negative lift, Vortex shedding

Abstract:

In the present work, the influence of heat on vortex shedding and thewake structure in a flow cylinder is analyzed. Flow past a heated twodimensional cylinder in the laminar regime is investigated in the rangeof Reynolds numbers 25 to 100 under varying buoyancy conditions,0<=Ri<=1.0 (where Ri is the Richardson number, indicates therelative dominance of the inertial and buoyant effects). A hybridFEM-FVM method is used to solve Navier-Stokes and energy equations. Thevortex shedding frequency defined non-dimensionally as Strouhal numberis observed to be increasing with heating. Vortex shedding behind heatedcylinder exhibit asymmetry in wake region due to stable and unstabledensity stratification below and above the cylinder respectively. Anegative lift is generated due to heating, in an otherwise symmetriczero time-averaged lift configuration, due to skewness in vortexshedding towards the direction of buoyancy. We also note that theheating brings down the drag slightly for the cases considered here. Wealso note here that at large Ri, the drag coefficient (CD)decrease by ˜30% at Re=25, percentage of decrease being lesspronounced at higher Re (=100).

Cite this Research Publication

Dr. Ajith Kumar S., S. Anil Lal, and A. Sameen, “Flow past a moderately heated horizontal cylinder at low Reynolds number”, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, vol. 230, no. 7, pp. 1224-1239 , 2016.