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Original title:
Effect of Surface Roughness on Vortex Shedding in The Wake of a Circular Cylinder in a Subcritical Regime
Authors: Uruba, Václav ; Procházka, Pavel P.
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2026, Praha (CZ), 20260218
Year: 2026
Language: eng
Abstract: An experimental study of vortex shedding in the wake of a circular cylinder at a subcritical Reynolds number of approximately 5 000 is presented, with emphasis on the influence of surface roughness. Planar particle image velocimetry (PIV) measurements were performed for a smooth cylinder and for a cylinder with uniformly distributed sand-grain roughness. Mean flow statistics show that surface roughness significantly reduces the size of the recirculation region and increases turbulence intensity in the near wake. The unsteady wake dynamics were analyzed using Oscillation Pattern Decomposition (OPD), which allows ident ification of the dominant vortex shedding mode and its higher harmonics. The results indicate a systematic decrease in Strouhal number for the rough cylinder compared with the smooth reference case. Phase aligned OPD mode topologies further reveal increase d streamwise spacing of vortical structures in the rough surface wake. The study demonstrates that surface roughness has a measurable effect on vortex shedding characteristics even in the subcritical flow regime.
Keywords: circular cylinder; OPD; surface roughness; vortex shedding; wake
Host item entry: Proceedings of Topical Problems of Fluid Mechanics 2026, ISBN 978-80-87012-92-5, ISSN 2336-5781
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: https://tpfm.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2026/33-TPFM2026.pdf
Original record: https://hdl.handle.net/11104/0379409
Permalink: http://www.nusl.cz/ntk/nusl-775077
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Uruba, Václav ; Procházka, Pavel P.
Document type: Papers
Conference/Event: Topical Problems of Fluid Mechanics 2026, Praha (CZ), 20260218
Year: 2026
Language: eng
Abstract: An experimental study of vortex shedding in the wake of a circular cylinder at a subcritical Reynolds number of approximately 5 000 is presented, with emphasis on the influence of surface roughness. Planar particle image velocimetry (PIV) measurements were performed for a smooth cylinder and for a cylinder with uniformly distributed sand-grain roughness. Mean flow statistics show that surface roughness significantly reduces the size of the recirculation region and increases turbulence intensity in the near wake. The unsteady wake dynamics were analyzed using Oscillation Pattern Decomposition (OPD), which allows ident ification of the dominant vortex shedding mode and its higher harmonics. The results indicate a systematic decrease in Strouhal number for the rough cylinder compared with the smooth reference case. Phase aligned OPD mode topologies further reveal increase d streamwise spacing of vortical structures in the rough surface wake. The study demonstrates that surface roughness has a measurable effect on vortex shedding characteristics even in the subcritical flow regime.
Keywords: circular cylinder; OPD; surface roughness; vortex shedding; wake
Host item entry: Proceedings of Topical Problems of Fluid Mechanics 2026, ISBN 978-80-87012-92-5, ISSN 2336-5781
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: https://tpfm.it.cas.cz/fm2015/im/admin/showfile/data/my/Papers/2026/33-TPFM2026.pdf
Original record: https://hdl.handle.net/11104/0379409
Permalink: http://www.nusl.cz/ntk/nusl-775077
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2026-06-21, last modified 2026-07-26