Frequency effects on lift and drag for flow past an oscillating cylinder

• Published in: Journal of fluids and structures Vol. 24; no. 3; pp. 382 - 399
• Main Authors: Zheng, Z.C., Zhang, N.
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.04.2008; Elsevier
• Subjects: Exact sciences and technology; Fluid dynamics; Frequency effects; Fundamental areas of phenomenology (including applications); General theory; Immersed-boundary method; Lift and drag; Oscillating cylinder; Physics; Rotational flow and vorticity; Oscillating cylinder; Immersed-boundary method; Frequency effects; Lift and drag; Vortex shedding; Frequency locking; Fluid dynamics; Eigenfrequency; Spectral analysis; Frequency effect; Lift; Oscillating flow; Internal flow; Drag; Wakes; Modelling; Dynamic model; Mesh generation; Turbulence structure; Cartesian coordinates
• ISSN: 0889-9746; 1095-8622
• DOI: 10.1016/j.jfluidstructs.2007.08.010

A transversely oscillating cylinder in a uniform flow is modeled to investigate frequency effects of flow-induced wake on lift and drag of the cylinder. Specifically, verified unsteady fluid dynamic simulations using an immersed-boundary method in a fixed Cartesian grid predict the flow structure around the cylinder and reveal how the integration of surface pressure and shear distributions provides lift and drag on the oscillating cylinder. In this study, frequency ranges to be considered are both near and away from the natural frequency of wake vortex shedding. Subsequently, the effects of frequency lock-in, superposition and demultiplication on lift and drag are discussed based on the spectral analysis of time histories of lift and drag.