Full-field pressure from snapshot and time-resolved volumetric PIV
Full-field pressure from snapshot and time-resolved volumetric PIV
This paper deals with pressure estimation from snapshot and time-resolved three-component (3C) volumetric PIV data using Taylor’s hypothesis, an Eulerian and a pseudo-Lagrangian approach. The Taylor’s hypothesis approach has been shown to provide accurate results for pressure in the case of 3C planar PIV data with an appropriate choice of convection velocity (de Kat and Ganapathisubramani 2013), and here we extend its use on 3C volumetric velocity snapshots. Application of the techniques to synthetic data shows that the Taylor’s hypothesis approach performs best using the streamwise mean as the convection velocity and is affected the least by noise, while the Eulerian approach suffers the most. In terms of resolution, the pseudo-Lagrangian approach is the most sensitive. Its accuracy can be improved by increasing the frame time-separation when computing the material derivative, at the expense of volume loss from fluid parcels leaving the FOV. Comparison of the techniques on turbulent boundary layer data with DNS supports these observations and shows that the Taylor’s hypothesis approach is the only way we can get pressure when time information is not present.
1-14
Laskari, Angeliki
15fd6017-4699-4cb5-bbf1-a158e8dcd70f
de Kat, Roeland
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
1 March 2016
Laskari, Angeliki
15fd6017-4699-4cb5-bbf1-a158e8dcd70f
de Kat, Roeland
d46a99a4-8653-4698-9ef4-46dd0c77ba5d
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Laskari, Angeliki, de Kat, Roeland and Ganapathisubramani, Bharathram
(2016)
Full-field pressure from snapshot and time-resolved volumetric PIV.
Experiments in Fluids, 57 (3), , [44].
(doi:10.1007/s00348-016-2129-5).
Abstract
This paper deals with pressure estimation from snapshot and time-resolved three-component (3C) volumetric PIV data using Taylor’s hypothesis, an Eulerian and a pseudo-Lagrangian approach. The Taylor’s hypothesis approach has been shown to provide accurate results for pressure in the case of 3C planar PIV data with an appropriate choice of convection velocity (de Kat and Ganapathisubramani 2013), and here we extend its use on 3C volumetric velocity snapshots. Application of the techniques to synthetic data shows that the Taylor’s hypothesis approach performs best using the streamwise mean as the convection velocity and is affected the least by noise, while the Eulerian approach suffers the most. In terms of resolution, the pseudo-Lagrangian approach is the most sensitive. Its accuracy can be improved by increasing the frame time-separation when computing the material derivative, at the expense of volume loss from fluid parcels leaving the FOV. Comparison of the techniques on turbulent boundary layer data with DNS supports these observations and shows that the Taylor’s hypothesis approach is the only way we can get pressure when time information is not present.
Text
FullFieldPressureFromPIV_AcceptedManuscript.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 18 January 2016
e-pub ahead of print date: 1 March 2016
Published date: 1 March 2016
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 388507
URI: http://eprints.soton.ac.uk/id/eprint/388507
ISSN: 0723-4864
PURE UUID: 6ad27755-9e00-4c48-a347-0957ac16688d
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Date deposited: 02 Mar 2016 15:36
Last modified: 15 Mar 2024 05:24
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Author:
Roeland de Kat
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