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Turbulent boundary layers over multiscale rough patches

Turbulent boundary layers over multiscale rough patches
Turbulent boundary layers over multiscale rough patches
In this work, we experimentally investigate the effects of multiscale rough patches on the drag and flow structure of a fully rough turbulent boundary layer in a wind tunnel. Several patches containing both organised and randomised arrangements of cubes of multiple sizes were tested in order to study the dependence of drag on the frontal solidity of the patch. One of the patches was also replicated with some of the sizes of cubes deleted in order to ascertain the importance of each scale of roughness. The drag of each patch was measured with a drag balance for a range of Reynolds numbers. Flow fields in several cross-sections were captured using PIV. Maps of the velocity deficit and increased turbulence activity in the wake of the patches were determined and used to define the extent of the internal boundary layer formed by each patch.
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052

Vanderwel, Christina and Ganapathisubramani, Bharathram (2016) Turbulent boundary layers over multiscale rough patches. Tenth International Symposium on Turbulence and Shear Flow Phenomena, Swissotel, United States. 06 - 09 Jul 2017. 6 pp . (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

In this work, we experimentally investigate the effects of multiscale rough patches on the drag and flow structure of a fully rough turbulent boundary layer in a wind tunnel. Several patches containing both organised and randomised arrangements of cubes of multiple sizes were tested in order to study the dependence of drag on the frontal solidity of the patch. One of the patches was also replicated with some of the sizes of cubes deleted in order to ascertain the importance of each scale of roughness. The drag of each patch was measured with a drag balance for a range of Reynolds numbers. Flow fields in several cross-sections were captured using PIV. Maps of the velocity deficit and increased turbulence activity in the wake of the patches were determined and used to define the extent of the internal boundary layer formed by each patch.

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Vanderwel_TSP10_Final - Accepted Manuscript
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More information

Accepted/In Press date: 26 November 2016
Venue - Dates: Tenth International Symposium on Turbulence and Shear Flow Phenomena, Swissotel, United States, 2017-07-06 - 2017-07-09

Identifiers

Local EPrints ID: 412680
URI: http://eprints.soton.ac.uk/id/eprint/412680
PURE UUID: 5ad6fe4d-c9eb-4111-9e85-8e725a07e012
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 25 Jul 2017 16:31
Last modified: 27 Jan 2020 13:44

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