Reduced-order Aeroelastic Model for Limit-cycle Oscillations in Vortex-dominated Unsteady Airfoil Flows

Suresh Babu, A. V., Ramesh, K. and Gopalarathnam, A. (2017) Reduced-order Aeroelastic Model for Limit-cycle Oscillations in Vortex-dominated Unsteady Airfoil Flows. 70th Annual Meeting of the APS Division of Fluid Dynamics, Denver, CO, USA, 19-21 Nov 2017.

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Abstract

In previous research, Ramesh et al (JFM,2014) developed a low-order discrete vortex method for modeling unsteady airfoil flows with intermittent leading edge vortex (LEV) shedding using a leading edge suction parameter (LESP). LEV shedding is initiated using discrete vortices (DVs) whenever the Leading Edge Suction Parameter (LESP) exceeds a critical value. In subsequent research, the method was successfully employed by Ramesh et al (JFS, 2015) to predict aeroelastic limit-cycle oscillations in airfoil flows dominated by intermittent LEV shedding. When applied to flows that require large number of time steps, the computational cost increases due to the increasing vortex count. In this research, we apply an amalgamation strategy to actively control the DV count, and thereby reduce simulation time. A pair each of LEVs and TEVs are amalgamated at every time step. The ideal pairs for amalgamation are identified based on the requirement that the flowfield in the vicinity of the airfoil is least affected (Spalart, 1988). Instead of placing the amalgamated vortex at the centroid, we place it at an optimal location to ensure that the leading-edge suction and the airfoil bound circulation are conserved. Results of the initial study are promising.

Item Type:Conference or Workshop Item
Status:Published
Refereed:No
Glasgow Author(s) Enlighten ID:Ramesh, Dr Kiran
Authors: Suresh Babu, A. V., Ramesh, K., and Gopalarathnam, A.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in 70th Annual Meeting of the APS Division of Fluid Dynamics 2017
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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