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Numerical study of turbulent manoeuvring-body wakes: interaction with a non-deformable free surface

Numerical study of turbulent manoeuvring-body wakes: interaction with a non-deformable free surface
Numerical study of turbulent manoeuvring-body wakes: interaction with a non-deformable free surface
Direct numerical simulation (DNS) is used to investigate the development of a turbulent wake created by an impulsively accelerating axisymmetric self-propelled body below a non-deformable free surface. The manoeuvring body is represented by the combination of an immersed boundary method and a body force. The Reynolds number based on either the diameter of the virtual body or the jet forcing intensity is relatively high (O(1000)), corresponding to the fully turbulent case. The vertical growth of the coherent structure behind the body is restricted by the upper and lower stress-free layers, and the wake signatures are observed to penetrate to the free surface. The late-time behaviour of the dipole induced due to vertical confinement can be predicted by scaling laws, also relevant to a stratified fluid.
direct numerical simulation, manoeuvring-body wake, vortex dipole
1468-5248
N17
Rojanaratanangkule, Watchapon
f6c3ad99-4077-4429-848e-bb317df26d9a
Thomas, T. Glyn
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Coleman, Gary N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Rojanaratanangkule, Watchapon
f6c3ad99-4077-4429-848e-bb317df26d9a
Thomas, T. Glyn
bccfa8da-6c8b-4eec-b593-00587d3ce3cc
Coleman, Gary N.
ea3639b9-c533-40d7-9edc-3c61246b06e0

Rojanaratanangkule, Watchapon, Thomas, T. Glyn and Coleman, Gary N. (2012) Numerical study of turbulent manoeuvring-body wakes: interaction with a non-deformable free surface Journal of Turbulence, 13, (17), N17. (doi:10.1080/14685248.2012.680550).

Record type: Article

Abstract

Direct numerical simulation (DNS) is used to investigate the development of a turbulent wake created by an impulsively accelerating axisymmetric self-propelled body below a non-deformable free surface. The manoeuvring body is represented by the combination of an immersed boundary method and a body force. The Reynolds number based on either the diameter of the virtual body or the jet forcing intensity is relatively high (O(1000)), corresponding to the fully turbulent case. The vertical growth of the coherent structure behind the body is restricted by the upper and lower stress-free layers, and the wake signatures are observed to penetrate to the free surface. The late-time behaviour of the dipole induced due to vertical confinement can be predicted by scaling laws, also relevant to a stratified fluid.

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More information

Published date: 7 June 2012
Keywords: direct numerical simulation, manoeuvring-body wake, vortex dipole
Organisations: Aeronautics, Astronautics & Comp. Eng, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 341743
URI: http://eprints.soton.ac.uk/id/eprint/341743
ISSN: 1468-5248
PURE UUID: dce25fc7-9ce0-440d-9f5e-ff6b25d76344

Catalogue record

Date deposited: 10 Sep 2012 10:34
Last modified: 18 Jul 2017 05:32

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Contributors

Author: Watchapon Rojanaratanangkule
Author: T. Glyn Thomas
Author: Gary N. Coleman

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