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Computational study of heat and fluid flow around a rotary oscillating cylinder at a high Re number

DOI: 10.1615/THMT-18.340
pages 359-370

Muhamed Hadziabdic
Faculty of Engineering and Natural Sciences, International University of Sarajevo, Bosnia and Herzegovina; and Department of Applied Physics, Delft University of Technology, Prins Bernhardlaan 6, 2628 BWDelft, The Netherlands

E. Palkin
Institute of Thermophysics SB RAS, Novosibirsk, Russia; Novosibirsk State University, Novosibirsk, Russia; Paul Scherrer Institute, Villigen PSI, Switzerland

R. Mullyadzhanov
Novosibirsk State University and Institute of Thermophysics SB RAS Pirogova St 2, 63090 Novosibirsk, Russia

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Sinopsis

The paper deals with flow over a rotationally oscillating cylinder at a subcritical Reynolds number (Re = 1.4×105) that is an order of magnitude higher than previously reported in the literature. The focus is on the control of drag force and heat transfer. Five forcing frequencies ƒ = ƒe0 = 1, 2.5, 3, 4, 5 and three forcing amplitudes Ω=ΩeD/2U = 1, 2, 3 are considered, where ƒo is the natural vortex-shedding frequency, U the free-stream velocity and D the cylinder diameter. We employed 3D URANS based on a second-moment closure, which was earlier verified by LES and experiments on flows over a stagnant, as well as two cases of rotary oscillating cylinders at the same Re number. The dramatic drag reduction occurs at frequencies equal and larger than ƒ = 2.5, while no reduction appears for the cylinder that oscillates with the natural frequency. The drag reduction is the result of a modified vortex shedding topology and related pressure field characterized by shrinking of the low pressure region behind the cylinder, all imposed by the rotary oscillation. The heat transfer from a cylinder wall is enhanced by the rotary oscillation resulting in the local Nusselt number which distribution along the cylinder wall strongly depends on the forcing amplitude and frequency.

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