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Numerical investigation of the turbulent energy budget in the wake of freely oscillating elastically mounted cylinder at low reduced velocities

Sarkar, Abhishek and Schluter, Jorg 2013, Numerical investigation of the turbulent energy budget in the wake of freely oscillating elastically mounted cylinder at low reduced velocities, Journal of fluids and structures, vol. 43, pp. 441-462, doi: 10.1016/j.jfluidstructs.2013.09.013.

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Title Numerical investigation of the turbulent energy budget in the wake of freely oscillating elastically mounted cylinder at low reduced velocities
Author(s) Sarkar, Abhishek
Schluter, JorgORCID iD for Schluter, Jorg orcid.org/0000-0001-7783-1361
Journal name Journal of fluids and structures
Volume number 43
Start page 441
End page 462
Total pages 22
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2013-11
ISSN 1095-8622
0889-9746
Keyword(s) large eddy simulation
vortex-induced vibrations(VIV)
turbulent mixing layer
coherent structures
circular cylinder
Summary We present a numerical study of the turbulent kinetic energy budget in the wake of cylinders undergoing Vortex-Induced Vibration (VIV). We show three-dimensional Large Eddy Simulations (LES) of an elastically mounted circular cylinder in the synchronization regime at Reynolds number of Re=8000. The Immersed Boundary Method (IBM) is used to account for the presence of the cylinder. The flow field in the wake is decomposed using the triple decomposition splitting the flow variables in mean, coherent and stochastic components. The energy transfer between these scales of motions are then studied and the results of the free oscillation are compared to those of a forced oscillation. The turbulent kinetic energy budget shows that the maximum amplitude of VIV is defined by the ability of the mean flow to feed energy to the coherent structures in the wake. At amplitudes above this maximum amplitude, the energy of the coherent structures needs to be fed additionally by small scale, stochastic energy in form of backscatter to sustain its motion. Furthermore, we demonstrate that the maximum amplitude of the VIV is defined by the integral length scale of the turbulence in the wake
Language eng
DOI 10.1016/j.jfluidstructs.2013.09.013
Field of Research 090199 Aerospace Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30087785

Document type: Journal Article
Collection: School of Engineering
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