Analysis of two-dimensional and three-dimensional wakes of long circular cylinders
Analysis of two-dimensional and three-dimensional wakes of long circular cylinders
The wake behind a bluff body constitutes an intrinsically three-dimensional flow and it is known that two-dimensional simulations yield to an unphysical prediction of the body forces because of the nature of the two-dimensional Navier-Stokes equations. However, three-dimensional simulations are too computationally expensive for cases such as marine risers, which have very large aspect ratios and are exposed to a high Reynolds number flow. A quantitative and qualitative study has been performed to investigate the fundamental differences on the wake of two-dimensional and three-dimensional fixed spanwise periodic cylinders for a Reynolds number of 10000 . A very fine unifrom grid (503M points) has been used for the near and mid wake range, and it is shown that the wake presents very different vortical structures when the spanwise dimensionality is omitted. In this case, forces such as lift and drag are overpredicted. The kinetic energy spectra of the flow is also investigated to further discuss the physics inherent of each case together and it is found that the contribution of the spanwise velocity on the large wavenumbers is significantly smaller than the other velocity components.
marine risers, computational fluid dynamics, two-dimensional turbulence, strip theory
Font Garcia, Bernat
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Weymouth, Gabriel
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Tutty, Owen
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June 2017
Font Garcia, Bernat
1c605529-b50d-4703-b8cc-4ccaa5dff7fc
Weymouth, Gabriel
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Tutty, Owen
c9ba0b98-4790-4a72-b5b7-09c1c6e20375
Font Garcia, Bernat, Weymouth, Gabriel and Tutty, Owen
(2017)
Analysis of two-dimensional and three-dimensional wakes of long circular cylinders.
Oceans'17 MTS/IEEE: A vision for sustaining our marine futures, Aberdeen, UK, Aberdeen, United Kingdom.
19 - 22 Jun 2017.
8 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
The wake behind a bluff body constitutes an intrinsically three-dimensional flow and it is known that two-dimensional simulations yield to an unphysical prediction of the body forces because of the nature of the two-dimensional Navier-Stokes equations. However, three-dimensional simulations are too computationally expensive for cases such as marine risers, which have very large aspect ratios and are exposed to a high Reynolds number flow. A quantitative and qualitative study has been performed to investigate the fundamental differences on the wake of two-dimensional and three-dimensional fixed spanwise periodic cylinders for a Reynolds number of 10000 . A very fine unifrom grid (503M points) has been used for the near and mid wake range, and it is shown that the wake presents very different vortical structures when the spanwise dimensionality is omitted. In this case, forces such as lift and drag are overpredicted. The kinetic energy spectra of the flow is also investigated to further discuss the physics inherent of each case together and it is found that the contribution of the spanwise velocity on the large wavenumbers is significantly smaller than the other velocity components.
Text
Font_Garcia_et_al 2017 - Analysis of two-dimensional and three-dimensional wakes of long circular cylinders
- Accepted Manuscript
More information
Accepted/In Press date: 1 April 2017
Published date: June 2017
Venue - Dates:
Oceans'17 MTS/IEEE: A vision for sustaining our marine futures, Aberdeen, UK, Aberdeen, United Kingdom, 2017-06-19 - 2017-06-22
Keywords:
marine risers, computational fluid dynamics, two-dimensional turbulence, strip theory
Organisations:
Fluid Structure Interactions Group, Aerodynamics & Flight Mechanics Group, Education Hub
Identifiers
Local EPrints ID: 411819
URI: http://eprints.soton.ac.uk/id/eprint/411819
PURE UUID: 6b815a6f-6ee8-4a19-b411-6f319b9738cb
Catalogue record
Date deposited: 26 Jun 2017 16:31
Last modified: 16 Mar 2024 05:13
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Contributors
Author:
Bernat Font Garcia
Author:
Owen Tutty
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