The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis

D'Adamo, Juan and González Gutierrez, Leo Miguel and Gronskis, Alejandro and Artana, Guillermo (2011). The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis. In: "6th Theoretical Fluid Mechanics Conference", 27/06/2011 - 30/06/2011, Honolulu, HI, EEUU. pp. 1-18.

Description

Title: The scenario of two-dimensional instabilities of the cylinder wake under EHD forcing: A linear stability analysis
Author/s:
  • D'Adamo, Juan
  • González Gutierrez, Leo Miguel
  • Gronskis, Alejandro
  • Artana, Guillermo
Item Type: Presentation at Congress or Conference (Article)
Event Title: 6th Theoretical Fluid Mechanics Conference
Event Dates: 27/06/2011 - 30/06/2011
Event Location: Honolulu, HI, EEUU
Title of Book: Proceedings of 6 th Theoretical Fluid Mechanics Conference
Date: 2011
Subjects:
Faculty: E.T.S.I. Navales (UPM)
Department: Enseñanzas Básicas de la Ingeniería Naval [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We propose to study the stability properties of an air flow wake forced by a dielectric barrier discharge (DBD) actuator, which is a type of electrohydrodynamic (EHD) actuator. These actuators add momentum to the flow around a cylinder in regions close to the wall and, in our case, are symmetrically disposed near the boundary layer separation point. Since the forcing frequencies, typical of DBD, are much higher than the natural shedding frequency of the flow, we will be considering the forcing actuation as stationary. In the first part, the flow around a circular cylinder modified by EHD actuators will be experimentally studied by means of particle image velocimetry (PIV). In the second part, the EHD actuators have been numerically implemented as a boundary condition on the cylinder surface. Using this boundary condition, the computationally obtained base flow is then compared with the experimental one in order to relate the control parameters from both methodologies. After validating the obtained agreement, we study the Hopf bifurcation that appears once the flow starts the vortex shedding through experimental and computational approaches. For the base flow derived from experimentally obtained snapshots, we monitor the evolution of the velocity amplitude oscillations. As to the computationally obtained base flow, its stability is analyzed by solving a global eigenvalue problem obtained from the linearized Navier–Stokes equations. Finally, the critical parameters obtained from both approaches are compared.

More information

Item ID: 12796
DC Identifier: http://oa.upm.es/12796/
OAI Identifier: oai:oa.upm.es:12796
Deposited by: Memoria Investigacion
Deposited on: 13 Dec 2012 12:16
Last Modified: 21 Apr 2016 12:04
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