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Experimental investigation of vortex properties in a turbulent boundary layer

Experimental investigation of vortex properties in a turbulent boundary layer
Experimental investigation of vortex properties in a turbulent boundary layer
Dual-plane particle image velocimetry experiments were performed in a turbulent boundary layer with Re? = 1160 to obtain all components of the velocity gradient tensor. Wall-normal locations in the logarithmic and wake region were examined. The availability of the complete gradient tensor facilitates improved identification of vortex cores and determination of their orientation and size. Inclination angles of vortex cores were computed using statistical tools such as two-point correlations and joint probability density functions. Also, a vortex identification technique was employed to identify individual cores and to compute inclination angles directly from instantaneous fields. The results reveal broad distributions of inclination angles at both locations. The results are consistent with the presence of many hairpin vortices which are most frequently inclined downstream at an angle of 45? with the wall. According to the probability density functions, a relatively small percentage of cores are inclined upstream. The number density of forward leaning cores decreases from the logarithmic to the outer region while the number density of backward-leaning cores remains relatively constant. These trends, together with the correlation statistics, suggest that the backward-leaning cores are part of smaller, weaker structures that have been distorted and convected by larger, predominantly forward-leaning eddies associated with the local shear
1070-6631
055105-[14pp]
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Longmire, Ellen K.
d6b212c3-0640-4f27-9375-9fee7cf95c1b
Marusic, Ivan
e8863dbc-d29e-4087-9269-ea1ef1d63f48
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Longmire, Ellen K.
d6b212c3-0640-4f27-9375-9fee7cf95c1b
Marusic, Ivan
e8863dbc-d29e-4087-9269-ea1ef1d63f48

Ganapathisubramani, Bharathram, Longmire, Ellen K. and Marusic, Ivan (2006) Experimental investigation of vortex properties in a turbulent boundary layer. Physics of Fluids, 18, 055105-[14pp]. (doi:10.1063/1.2196089).

Record type: Article

Abstract

Dual-plane particle image velocimetry experiments were performed in a turbulent boundary layer with Re? = 1160 to obtain all components of the velocity gradient tensor. Wall-normal locations in the logarithmic and wake region were examined. The availability of the complete gradient tensor facilitates improved identification of vortex cores and determination of their orientation and size. Inclination angles of vortex cores were computed using statistical tools such as two-point correlations and joint probability density functions. Also, a vortex identification technique was employed to identify individual cores and to compute inclination angles directly from instantaneous fields. The results reveal broad distributions of inclination angles at both locations. The results are consistent with the presence of many hairpin vortices which are most frequently inclined downstream at an angle of 45? with the wall. According to the probability density functions, a relatively small percentage of cores are inclined upstream. The number density of forward leaning cores decreases from the logarithmic to the outer region while the number density of backward-leaning cores remains relatively constant. These trends, together with the correlation statistics, suggest that the backward-leaning cores are part of smaller, weaker structures that have been distorted and convected by larger, predominantly forward-leaning eddies associated with the local shear

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Published date: May 2006
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 187407
URI: http://eprints.soton.ac.uk/id/eprint/187407
ISSN: 1070-6631
PURE UUID: 6e99461b-860a-4438-ba7b-d5a7ad5b2d11
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

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Date deposited: 19 May 2011 07:33
Last modified: 15 Mar 2024 03:37

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Author: Ellen K. Longmire
Author: Ivan Marusic

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