Proper Orthogonal Decomposition and Spectral Analysis of a Wall-Mounted Square Cylinder Wake


  • Henrique Fanini Leite Divisão de Pós Graduação, Instituto Tecnológico de Aeronáutica (ITA)
  • Ana Cristina Avelar Divisão de Aerodinâmica (ALA), Instituto de Aeronáutica e Espaço (IAE)
  • Leandra de Abreu Divisão de Pós Graduação, Instituto Tecnológico de Aeronáutica (ITA)
  • Daniel Schuch Divisão de Estudos Atmosféricos (ACA), Instituto de Aeronáutica e Espaço (IAE)
  • André Cavalieri


PIV method application, Proper orthogonal decomposition, Finite cylinders, Unsteady flow, Time-resolved PIV


The flow patterns over a finite square cylinder of aspect ratio of 3 were analyzed experimentally in a subsonic wind tunnel using the time-resolved particle image velocimetry (TR - PIV) techniques. The near wake flow structures and vortex shedding characteristics were investigated using mean flow analysis, spectral analysis and proper orthogonal decomposition (POD). The cylinders were fixed on a elliptical leading edge flat plate, creating a boundary layer which interacted with the cylinder wake. The 2D PIV measurements were conducted at a low horizontal plane, z/h = 0.3, to investigate possible boundary layer interactions. Due to the complexity of the phenomena, the flow was characterized both in terms of average behavior and time-resolved velocity fields. Both symmetrical and anti-symmetrical vortices structures occur in the cylinder wake, which can be identified based on the coefficients of the first four POD modes. The results indicated that the alternating Karman vortex structures are dominant, described by the first two POD modes.

Author Biography

Henrique Fanini Leite, Divisão de Pós Graduação, Instituto Tecnológico de Aeronáutica (ITA)

Bolsista de Doutorado do programa PG-CTE, trabalha com visualização de escoamentos através das técnicas PIV e PSP






Original Papers