Sensitivity of 2-D turbulent flow past a D-shaped cylinder using global stability | Zendy

Philippe Méliga | Zendy; Grégory Pujals | Zendy; É. Serre | Zendy

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Sensitivity of 2-D turbulent flow past a D-shaped cylinder using global stability

Author(s) -

Philippe Méliga,

Grégory Pujals,

É. Serre

Publication year - 2012

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.4724211

Subject(s) - physics , wake , turbulence , cylinder , reynolds number , mechanics , sensitivity (control systems) , flow (mathematics) , mean flow , flow control (data) , geometry , mathematics , computer network , electronic engineering , computer science , engineering

International audienceWe use adjoint-based gradients to analyze the sensitivity of turbulent wake past a D-shaped cylinder at Re = 13000. We assess the ability of a much smaller control cylinder in altering the shedding frequency, as predicted by the eigenfrequency of the most unstable global mode to the mean flow. This allows performing beforehand identification of the sensitive regions, i.e., without computing the actually controlled states. Our results obtained in the frame of 2-D, unsteady Reynolds-averaged Navier-Stokes compare favorably with experimental data reported by Parezanović and Cadot [J. Fluid Mech.693, 115 (2012)] and suggest that the control cylinder acts primarily through a local modification of the mean flow profiles

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