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Drag and near wake characteristics of flat plates normal to the flow with fractal edge geometries

Drag and near wake characteristics of flat plates normal to the flow with fractal edge geometries
Drag and near wake characteristics of flat plates normal to the flow with fractal edge geometries
Past results have suggested that the drag coefficient and the shedding frequencies of regular polygon plates all fall within a very narrow band of values. In this study, we introduce a variety of length scales into the perimeter of a square plate and study the effects this has on the wake characteristics and overall drag. The perimeter of the plate can be made as long as allowed by practical constraints with as many length scales as desired under these constraints without changing the area of the plate. A total of eight fractal-perimeter plates were developed, split into two families of different fractal dimensions all of which had the same frontal area. It is found that by increasing the number of fractal iterations and thus the perimeter, the drag coefficient increases by up to 7%. For the family of fractal plates with the higher dimension, it is also found that when the perimeter increases above a certain threshold the drag coefficient drops back again. Furthermore, the shedding frequency remains the same but the intensity of the shedding decreases with increasing fractal dimension. The size of the wake also decreases with increasing fractal dimension and has some dependence on iteration without changing the area of the plate
0169-5983
61406
Nedic, B.
4a060eb0-6b3d-46bc-a08f-493a4c606f7b
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
Vassilicos, J.C.
e3e74602-557c-450b-aa9a-3d28a1721f1a
Nedic, B.
4a060eb0-6b3d-46bc-a08f-493a4c606f7b
Ganapathisubramani, B.
5e69099f-2f39-4fdd-8a85-3ac906827052
Vassilicos, J.C.
e3e74602-557c-450b-aa9a-3d28a1721f1a

Nedic, B., Ganapathisubramani, B. and Vassilicos, J.C. (2013) Drag and near wake characteristics of flat plates normal to the flow with fractal edge geometries. Fluid Dynamics Research, 45 (6), 61406. (doi:10.1088/0169-5983/45/6/061406).

Record type: Article

Abstract

Past results have suggested that the drag coefficient and the shedding frequencies of regular polygon plates all fall within a very narrow band of values. In this study, we introduce a variety of length scales into the perimeter of a square plate and study the effects this has on the wake characteristics and overall drag. The perimeter of the plate can be made as long as allowed by practical constraints with as many length scales as desired under these constraints without changing the area of the plate. A total of eight fractal-perimeter plates were developed, split into two families of different fractal dimensions all of which had the same frontal area. It is found that by increasing the number of fractal iterations and thus the perimeter, the drag coefficient increases by up to 7%. For the family of fractal plates with the higher dimension, it is also found that when the perimeter increases above a certain threshold the drag coefficient drops back again. Furthermore, the shedding frequency remains the same but the intensity of the shedding decreases with increasing fractal dimension. The size of the wake also decreases with increasing fractal dimension and has some dependence on iteration without changing the area of the plate

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More information

Published date: 2013
Organisations: Aeronautics, Astronautics & Comp. Eng, Aerodynamics & Flight Mechanics Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 359351
URI: http://eprints.soton.ac.uk/id/eprint/359351
ISSN: 0169-5983
PURE UUID: 86335180-ab19-428d-843a-5f310aaef75c
ORCID for B. Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 28 Oct 2013 14:31
Last modified: 17 Dec 2019 01:40

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