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Estimation of unsteady aerodynamic forces using pointwise velocity data

Estimation of unsteady aerodynamic forces using pointwise velocity data
Estimation of unsteady aerodynamic forces using pointwise velocity data
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
0022-1120
Gomez, F.
3cd7f89a-64df-4c02-b5c5-f6823cdf3180
Sharma, A.S.
cdd9deae-6f3a-40d9-864c-76baf85d8718
Blackburn, H.M.
ae789033-1e30-4261-91a6-fd2e136b0ff3
Gomez, F.
3cd7f89a-64df-4c02-b5c5-f6823cdf3180
Sharma, A.S.
cdd9deae-6f3a-40d9-864c-76baf85d8718
Blackburn, H.M.
ae789033-1e30-4261-91a6-fd2e136b0ff3

Gomez, F., Sharma, A.S. and Blackburn, H.M. (2016) Estimation of unsteady aerodynamic forces using pointwise velocity data. Journal of Fluid Mechanics, 804. (doi:10.1017/jfm.2016.546).

Record type: Article

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

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Accepted/In Press date: 13 August 2016
e-pub ahead of print date: 8 September 2016
Published date: 11 October 2016
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 401422
URI: http://eprints.soton.ac.uk/id/eprint/401422
ISSN: 0022-1120
PURE UUID: faf3b39a-06d8-4466-83db-19266412dc97
ORCID for A.S. Sharma: ORCID iD orcid.org/0000-0002-7170-1627

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Date deposited: 13 Oct 2016 12:43
Last modified: 15 Mar 2024 05:58

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Contributors

Author: F. Gomez
Author: A.S. Sharma ORCID iD
Author: H.M. Blackburn

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