Spatiotemporal spectral analysis of a forced cylinder wake

spectral_analysisSpatiotemporal spectral analysis of a forced cylinder wake
J. D’Adamo; R. Godoy-Diana & J. E. Wesfreid.
Physical Review E, 84 : 056308 (2011).

Abstract: The wake of a circular cylinder performing rotary oscillations is studied using hydrodynamic tunnel experiments at $Re=100$. Two-dimensional particle image velocimetry on the mid-plane perpendicular to the axis of cylinder is used to characterize the spatial development of the flow and its stability properties. The lock-in phenomenon that determines the boundaries between regions of the forcing parameter space were the wake is globally unstable or convectively unstable is scrutinized using the experimental data. A novel method based on the analysis of power density spectra of the flow allows us to give a detailed description of the forced wake, shedding light on the energy distribution in the different frequency components and in particular on a cascade-like mechanism evidenced for a high amplitude of the forcing oscillation. In addition, a calculation of the drag from the velocity field is performed, allowing us to relate the resulting force on the body to the wake properties.


  author = {{D'Adamo}, J. and {Godoy-Diana}, R. and Wesfreid, J. E.},
  title = {Spatiotemporal spectral analysis of a forced cylinder wake},
  month = {11},
  journal = {Physical Review E},
  year = {2011},
  volume = {84},
  pages = {056308}

Article in the publisher site: [doi:10.1103/PhysRevE.84.056308]
Article here: [PDF file]