Flow over a flat plate with uniform inlet and incident coherent gusts

Imran Afgan, Sofiane Benhamadouche, Xingsi Han, Pierre Sagaut, Dominique Laurence

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The flow over a flat plate at a Reynolds number of 750 is numerically investigated via fine large-eddy simulation (LES), first at normal ( 90° ) and then at oblique ( 45° ) incidence flow direction with a uniform steady inlet. The results are in complete agreement with the direct numerical simulation (DNS) and experimental data, thereby serving as a validation for the present simulations. For the normal ( 90° ) uniform inflow case, coherent vortices are alternately shed from both leading edges of the plate, whereas for the oblique ( 45° ) uniform inflow case the vortices shed from the two sides of the plate interact strongly resulting in a quasi-periodic force response. The normal flat plate is then analysed with an incident gust signal with varying amplitude and time period. For these incident coherent gust cases, a reference test case with variable coherent inlet is first studied and the results are compared to a steady inlet simulation, with a detailed analysis of the flow behaviour and the wake response under the incident gust. Finally, the flat plate response to 16 different gust profiles is studied. A transient drag reconstruction for these incident coherent gust cases is then presented based on a frequency-dependent transfer function and phase spectrum analysis.

Original languageBritish English
Pages (from-to)457-485
Number of pages29
JournalJournal of Fluid Mechanics
Volume720
DOIs
StatePublished - Apr 2013

Keywords

  • flow control
  • turbulent flows
  • vortex shedding

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