Instantaneous planar pressure determination from PIV in turbulent flow
Instantaneous planar pressure determination from PIV in turbulent flow
This paper deals with the determination of instantaneous planar pressure fields from velocity data obtained by particle image velocimetry (PIV) in turbulent flow. The operating principles of pressure determination using a Eulerian or a Lagrangian approach are described together with theoretical considerations on its expected performance. These considerations are verified by a performance assessment on a synthetic flow field. Based on these results, guidelines regarding the temporal and spatial resolution required are proposed. The interrogation window size needs to be 5 times smaller than the flow structures and the acquisition frequency needs to be 10 times higher than the corresponding flow frequency (e.g. Eulerian time scales for the Eulerian approach). To further assess the experimental viability of the pressure evaluation methods, stereoscopic PIV and tomographic PIV experiments on a square cylinder flow (Re D = 9,500) were performed, employing surface pressure data for validation. The experimental results were found to support the proposed guidelines.
1089-1106
de Kat, R.
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
van Oudheusden, B.W.
2e0bdc67-1e33-4654-964f-3820342f4afd
May 2012
de Kat, R.
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
van Oudheusden, B.W.
2e0bdc67-1e33-4654-964f-3820342f4afd
de Kat, R. and van Oudheusden, B.W.
(2012)
Instantaneous planar pressure determination from PIV in turbulent flow.
Experiments in Fluids, 52 (5), .
(doi:10.1007/s00348-011-1237-5).
Abstract
This paper deals with the determination of instantaneous planar pressure fields from velocity data obtained by particle image velocimetry (PIV) in turbulent flow. The operating principles of pressure determination using a Eulerian or a Lagrangian approach are described together with theoretical considerations on its expected performance. These considerations are verified by a performance assessment on a synthetic flow field. Based on these results, guidelines regarding the temporal and spatial resolution required are proposed. The interrogation window size needs to be 5 times smaller than the flow structures and the acquisition frequency needs to be 10 times higher than the corresponding flow frequency (e.g. Eulerian time scales for the Eulerian approach). To further assess the experimental viability of the pressure evaluation methods, stereoscopic PIV and tomographic PIV experiments on a square cylinder flow (Re D = 9,500) were performed, employing surface pressure data for validation. The experimental results were found to support the proposed guidelines.
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Published date: May 2012
Organisations:
Aerodynamics & Flight Mechanics Group
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Local EPrints ID: 367149
URI: http://eprints.soton.ac.uk/id/eprint/367149
ISSN: 0723-4864
PURE UUID: abd9d13d-1ed3-4c71-837a-51f14b0334c7
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Date deposited: 19 Aug 2014 09:23
Last modified: 14 Mar 2024 17:24
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Author:
R. de Kat
Author:
B.W. van Oudheusden
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