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Analysis of the wake dynamics of stiff and flexible cantilever beams using POD and DMD

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Author

  • Alper Cesur
  • Christian Carlsson
  • A. Feymark
  • Laszlo Fuchs
  • Johan Revstedt

Summary, in English

The wake flow behind a cantilever beam of quadratic cross-section at a Reynolds number of 50,000 is investigated using detailed simulations. Two cases are considered, the first one using a stiff beam and the second one with a beam allowing for elastic deformation due to the hydrodynamic forces. The flow is simulated using an implicit large eddy simulation (ILES) approach in OpenFOAM and the structural deformation of the beam is found from a non-linear finite element approach using OOFEM. The motion of the fluid mesh due to the structural deformation is handled by an ALE method. The wake structures are investigated using proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) of the flow field. The results show that apart from the wake structures originating from the vortex shedding there is also a low frequency mode, which is an oscillatory motion in the stream-wise direction, present. (C) 2014 Elsevier Ltd. All rights reserved.

Publishing year

2014

Language

English

Pages

27-41

Publication/Series

Computers & Fluids

Volume

101

Document type

Journal article

Publisher

Elsevier

Topic

  • Fluid Mechanics and Acoustics

Keywords

  • Fluid-structure interaction
  • Wake flow
  • Large eddy simulation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0045-7930