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Fluid-structure coupling mechanism and its aerodynamic effect on membrane aerofoils

Fluid-structure coupling mechanism and its aerodynamic effect on membrane aerofoils
Fluid-structure coupling mechanism and its aerodynamic effect on membrane aerofoils

Fluid-structure interactions of elastic membrane aerofoils are investigated at Reynolds number and low angle of attack. The dynamics of the fluid and membrane coupled system are solved using direct numerical simulation (DNS), where the geometry and boundary conditions were applied using a boundary data immersion method. Although membrane aerofoils improve the aerodynamic performance close to stall conditions compared to rigid aerofoils, it has previously been found that membrane aerofoils show lower aerodynamic efficiency at low angles of attack. This study focuses on the coupling mechanism at an angle of attack of 8 degrees, which is below the stall angle. The dynamic behaviour of the coupled system was characterised via spectral analysis in the wavenumber and frequency domain, which allowed the propagating wave nature of the membrane vibrations and their effect on the surrounding pressure field to be clarified. The membrane vibrations are found to introduce upstream-propagating pressure waves that appear to be responsible for a loss in aerodynamic efficiency compared to a rigid aerofoil. Comparison of two-A nd three-dimensional results reveals that the three-dimensional flow development causes a decrease in the amplitude of the system fluctuations, but the same coupling mechanism is present.

aerodynamics, flow-structure interactions
0022-1120
1127-1156
Serrano-Galiano, Sonia
37481f23-27f2-4837-9739-2dd4c67294b5
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Serrano-Galiano, Sonia
37481f23-27f2-4837-9739-2dd4c67294b5
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa

Serrano-Galiano, Sonia, Sandham, Neil D. and Sandberg, Richard D. (2018) Fluid-structure coupling mechanism and its aerodynamic effect on membrane aerofoils. Journal of Fluid Mechanics, 848, 1127-1156. (doi:10.1017/jfm.2018.398).

Record type: Article

Abstract

Fluid-structure interactions of elastic membrane aerofoils are investigated at Reynolds number and low angle of attack. The dynamics of the fluid and membrane coupled system are solved using direct numerical simulation (DNS), where the geometry and boundary conditions were applied using a boundary data immersion method. Although membrane aerofoils improve the aerodynamic performance close to stall conditions compared to rigid aerofoils, it has previously been found that membrane aerofoils show lower aerodynamic efficiency at low angles of attack. This study focuses on the coupling mechanism at an angle of attack of 8 degrees, which is below the stall angle. The dynamic behaviour of the coupled system was characterised via spectral analysis in the wavenumber and frequency domain, which allowed the propagating wave nature of the membrane vibrations and their effect on the surrounding pressure field to be clarified. The membrane vibrations are found to introduce upstream-propagating pressure waves that appear to be responsible for a loss in aerodynamic efficiency compared to a rigid aerofoil. Comparison of two-A nd three-dimensional results reveals that the three-dimensional flow development causes a decrease in the amplitude of the system fluctuations, but the same coupling mechanism is present.

Full text not available from this repository.

More information

Accepted/In Press date: 13 May 2018
e-pub ahead of print date: 13 June 2018
Published date: 10 August 2018
Keywords: aerodynamics, flow-structure interactions

Identifiers

Local EPrints ID: 424830
URI: http://eprints.soton.ac.uk/id/eprint/424830
ISSN: 0022-1120
PURE UUID: 937950ac-329d-4e97-b734-422d44ba664a
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944
ORCID for Richard D. Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

Catalogue record

Date deposited: 05 Oct 2018 11:49
Last modified: 07 Oct 2020 01:42

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