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
July 2017
Vanderwel, Christina
fbc030f0-1822-4c3f-8e90-87f3cd8372bb
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Vanderwel, Christina and Ganapathisubramani, Bharathram
(2017)
Turbulent boundary layers over multiscale rough patches.
10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, , Chicago, United States.
06 - 09 Jul 2017.
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(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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Published date: July 2017
Venue - Dates:
10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, , Chicago, United States, 2017-07-06 - 2017-07-09
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Local EPrints ID: 491629
URI: http://eprints.soton.ac.uk/id/eprint/491629
PURE UUID: 7e711594-abf1-4be0-a542-e523fce09409
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Date deposited: 03 Jul 2024 09:09
Last modified: 11 Jul 2024 01:53
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