University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Nonlinear dynamics and synthetic-jet-based control of a canonical separated flow

Kotapati, RB, Mittal, R, Marxen, O, Ham, F, You, D and Cattafesta, LN (2010) Nonlinear dynamics and synthetic-jet-based control of a canonical separated flow Journal of Fluid Mechanics, 654. pp. 65-97.

Full text not available from this repository.

Abstract

A novel flow configuration devised for investigation of active control of separated airfoil flows using synthetic jets is presented. The configuration consists of a flat plate, with an elliptic leading edge and a blunt trailing edge, at zero incidence in a free stream. Flow separation is induced on the upper surface of the airfoil at the aft-chord location by applying suction and blowing on the top boundary of the computational domain. Typical separated airfoil flows are generally characterized by at least three distinct frequency scales corresponding to the shear layer instability, the unsteadiness of the separated region and the vortex shedding in the wake, and all these features are present in the current flow. Two-dimensional Navier-Stokes simulations of this flow at a chord Reynolds number of 6 104 have been carried out to examine the nonlinear dynamics in this flow and its implications for synthetic-jet-based separation control. The results show that there is a strong nonlinear coupling between the various features of the flow, and that the uncontrolled as well as the forced flow is characterized by a variety of lock-on states that result from this nonlinear coupling. The most effective separation control is found to occur at the highest forcing frequency for which both the shear layer and the separated region lock on to the forcing frequency. The effects of the Reynolds number on the scaling of the characteristic frequencies of the separated flow and its subsequent control are studied by repeating some of the simulations at a higher Reynolds number of 1 105. © 2010 Cambridge University Press.

Item Type: Article
Authors :
NameEmailORCID
Kotapati, RBUNSPECIFIEDUNSPECIFIED
Mittal, RUNSPECIFIEDUNSPECIFIED
Marxen, Oo.marxen@surrey.ac.ukUNSPECIFIED
Ham, FUNSPECIFIEDUNSPECIFIED
You, DUNSPECIFIEDUNSPECIFIED
Cattafesta, LNUNSPECIFIEDUNSPECIFIED
Date : 1 July 2010
Identification Number : 10.1017/S002211201000042X
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:28
Last Modified : 17 May 2017 15:11
URI: http://epubs.surrey.ac.uk/id/eprint/839328

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800