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Neutral flow over a series of rough hills: a laboratory experiment

Neutral flow over a series of rough hills: a laboratory experiment
Neutral flow over a series of rough hills: a laboratory experiment
This paper presents laboratory experiments of aerodynamically fully rough, neutral flow over a series of sinusoidal hills. Two sets of hills, with maximum gradients (slopes) of 0.2 (10°) and 0.4 (20°), were considered. The flow remained attached in the former case while separation occurred in the latter. Characteristics of the mean flow and turbulence statistics are discussed and compared with profiles over a flat surface covered with the same roughness as the hills. Comparisons are made with linear theory predictions for the flow in the inner region and aloft. Accurate measurements of the surface pressure were also made, enabling the comparison between the measured pressure drag and predictions from theoretical and computational work with different turbulent closure schemes. Organised secondary flow in the spanwise direction, observed previously in both experimental and computational studies, was also observed here over the small hills.
0006-8314
1-30
Athanassiadou, M.
12dfe1b9-6ab7-4447-8882-e00e8b52d5b3
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Athanassiadou, M.
12dfe1b9-6ab7-4447-8882-e00e8b52d5b3
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61

Athanassiadou, M. and Castro, I.P. (2001) Neutral flow over a series of rough hills: a laboratory experiment. Boundary-Layer Meteorology, 101 (1), 1-30. (doi:10.1023/A:1019250801054).

Record type: Article

Abstract

This paper presents laboratory experiments of aerodynamically fully rough, neutral flow over a series of sinusoidal hills. Two sets of hills, with maximum gradients (slopes) of 0.2 (10°) and 0.4 (20°), were considered. The flow remained attached in the former case while separation occurred in the latter. Characteristics of the mean flow and turbulence statistics are discussed and compared with profiles over a flat surface covered with the same roughness as the hills. Comparisons are made with linear theory predictions for the flow in the inner region and aloft. Accurate measurements of the surface pressure were also made, enabling the comparison between the measured pressure drag and predictions from theoretical and computational work with different turbulent closure schemes. Organised secondary flow in the spanwise direction, observed previously in both experimental and computational studies, was also observed here over the small hills.

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Published date: 2001

Identifiers

Local EPrints ID: 21734
URI: http://eprints.soton.ac.uk/id/eprint/21734
ISSN: 0006-8314
PURE UUID: 3fa3ab44-77e5-49ab-bc78-f93b7c169fbd

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Date deposited: 13 Mar 2006
Last modified: 15 Mar 2024 06:32

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Author: M. Athanassiadou
Author: I.P. Castro

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