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

Henrique Fanini Leite, Ana Cristina Avelar, Leandra de Abreu, Daniel Schuch, André Cavalieri
2018 Journal of Aerospace Technology and Management  
The fl ow patterns over a fi nite 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 fl ow structures and vortex shedding characteristics were investigated using mean fl ow analysis, spectral analysis and proper orthogonal decomposition (POD). The cylinders were fi xed on a elliptical leading edge fl at plate, creating a boundary layer which interacted with the
more » ... 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 fl ow was characterized both in terms of average behavior and time-resolved velocity fi elds. Both symmetrical and anti-symmetrical vortices structures occur in the cylinder wake, which can be identifi ed based on the coeffi cients of the fi rst four POD modes. The results indicated that the alternating Karman vortex structures are dominant, described by the fi rst two POD modes.
doi:10.5028/jatm.v10.867 fatcat:dsflnntjz5e5dhktzbz6n5h7rm