The paper presents computational results of 3D flow past a cylinder forced to oscillate: (a) transversely with respect to a uniform stream and (b) both transversely and in-line with respect to a uniform stream, following a figure-eight trajectory. For a flow from left to right the figure-eight is traversed counterclockwise in the upper half-plane. Direct numerical simulation (DNS) of the Navier–Stokes equations for 3D flow is performed using a spectral element code. Computations are carried out for a Reynolds number equal to 400, at a transverse oscillation frequency equal to the natural frequency of the Kármán vortex street. For both oscillation modes, the transverse oscillation amplitude is varied from 0 to 0.60 cylinder diameters. The forces on the cylinder are calculated and related to flow structure in the wake. The results indicate that, in general, the presence of in-line oscillation increases the magnitude of forces acting on the cylinder, as well as the power transfer from the flow to the structure. Flow visualizations indicate that, for the figure-eight mode, low-amplitude forcing tends to reduce the wake three-dimensionality. However, at high oscillation amplitudes, the wake structure is found to become more complex at increasing amplitude.
Numerical Simulation of Three-Dimensional Flow Past a Cylinder Oscillating at the Strouhal Frequency
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 25, 2013; final manuscript received June 19, 2014; published online September 15, 2014. Assoc. Editor: Samir Ziada.
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Peppa, S., Kaiktsis, L., and Triantafyllou, G. S. (September 15, 2014). "Numerical Simulation of Three-Dimensional Flow Past a Cylinder Oscillating at the Strouhal Frequency." ASME. J. Pressure Vessel Technol. February 2015; 137(1): 011302. https://doi.org/10.1115/1.4027890
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