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Estimation of unsteady aerodynamic forces using pointwise velocity data

Published online by Cambridge University Press:  08 September 2016

F. Gómez Open the ORCID record for F. Gómez [Opens in a new window] ,
A. S. Sharma  and
H. M. Blackburn
F. Gómez*
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC 3800, Australia
A. S. Sharma
Affiliation:
Aerodynamics and Flight Mechanics, University of Southampton, Southampton SO17 1BJ, UK
H. M. Blackburn
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC 3800, Australia
*
†Email address for correspondence: [email protected]
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Abstract

A novel method to estimate unsteady aerodynamic force coefficients from pointwise velocity measurements is presented. As opposed to other existing methodologies, time-resolved full velocity fields are not required. The methodology is based on a resolvent-based reduced-order model which requires the mean flow to obtain physical flow structures and pointwise measurement to calibrate their amplitudes. A computationally affordable time-stepping methodology to obtain resolvent modes in non-trivial flow domains is introduced and compared with previous existing matrix-free and matrix-forming strategies. The technique is applied to the unsteady flow around an inclined square cylinder at low Reynolds number. The potential of the methodology is demonstrated through good agreement between the fluctuating pressure distribution on the cylinder and the temporal evolution of the unsteady lift and drag coefficients predicted by the model and those computed by direct numerical simulation.

JFM classification

Aerodynamics: Aerodynamics Nonlinear Dynamical Systems: Low-dimensional models Nonlinear Dynamical Systems: Nonlinear Dynamical Systems
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 804 , 10 October 2016 , R4
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Copyright
© 2016 Cambridge University Press 

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