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Large eddy simulations of flow around underwater gliders and the impact on sensor measurements

Large eddy simulations of flow around underwater gliders and the impact on sensor measurements
Large eddy simulations of flow around underwater gliders and the impact on sensor measurements
Numerical studies of the flow over an underwater glider was simulated to investigate; 1) the extent to which the measurements of sensors (including turbulence sensors) on an AUV are affected by the distortion of the flow around the vehicle body, 2) the occurrence of bioluminescence in the wakes of autonomous vehicles, and 3) the quantification of the hydrodynamic forces on AUV’s. Two example simulations were conducted. In both cases the flow around a Slocum Mk II glider was simulated and the second example included a MicroRider turbulence package mounted on top of the glider. Our preliminary results suggest that the usual position of the oxygen sensor on a Slocum glider may be within a separated wake that could significantly affect the data quality. Flow distortion at the location of the shear probes on the turbulence package is low but could result in a small underestimation of the magnitude of dissipation. We also find that the shear stress on the wing edges of a glider could be sufficient to stimulate bioluminescence in certain environments but is at the lower end the range at which bioluminescence occurs. Lift and drag forces diagnosed from the simulations were consistent with data from gliders but a more detailed study is needed to assess the quantitative accuracy of these results.
Moat, B. I.
6b3f9648-38c1-451a-bed0-b41c85314791
Smeed, David
79eece5a-c870-47f9-bba0-0a4ef0369490
Marcinko, Charlotte
e5452463-c32b-4cbc-b3df-cf4da7e8cd8f
Popinet, S.
e324849e-3501-458e-9487-8c4f498f8c3a
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Moat, B. I.
6b3f9648-38c1-451a-bed0-b41c85314791
Smeed, David
79eece5a-c870-47f9-bba0-0a4ef0369490
Marcinko, Charlotte
e5452463-c32b-4cbc-b3df-cf4da7e8cd8f
Popinet, S.
e324849e-3501-458e-9487-8c4f498f8c3a
Turnock, Stephen
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080

Moat, B. I., Smeed, David, Marcinko, Charlotte, Popinet, S., Turnock, Stephen and Palmer, Martin (2016) Large eddy simulations of flow around underwater gliders and the impact on sensor measurements. 7th EGO Conference on Autonomous Ocean Gliders and their Applications, NOC, Southampton, UK, Southampton, United Kingdom. 26 - 29 Sep 2016.

Record type: Conference or Workshop Item (Paper)

Abstract

Numerical studies of the flow over an underwater glider was simulated to investigate; 1) the extent to which the measurements of sensors (including turbulence sensors) on an AUV are affected by the distortion of the flow around the vehicle body, 2) the occurrence of bioluminescence in the wakes of autonomous vehicles, and 3) the quantification of the hydrodynamic forces on AUV’s. Two example simulations were conducted. In both cases the flow around a Slocum Mk II glider was simulated and the second example included a MicroRider turbulence package mounted on top of the glider. Our preliminary results suggest that the usual position of the oxygen sensor on a Slocum glider may be within a separated wake that could significantly affect the data quality. Flow distortion at the location of the shear probes on the turbulence package is low but could result in a small underestimation of the magnitude of dissipation. We also find that the shear stress on the wing edges of a glider could be sufficient to stimulate bioluminescence in certain environments but is at the lower end the range at which bioluminescence occurs. Lift and drag forces diagnosed from the simulations were consistent with data from gliders but a more detailed study is needed to assess the quantitative accuracy of these results.

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More information

Published date: 14 December 2016
Venue - Dates: 7th EGO Conference on Autonomous Ocean Gliders and their Applications, NOC, Southampton, UK, Southampton, United Kingdom, 2016-09-26 - 2016-09-29

Identifiers

Local EPrints ID: 452977
URI: http://eprints.soton.ac.uk/id/eprint/452977
PURE UUID: 9b675c4a-fd0e-463e-9e68-726f2d17fa69
ORCID for Stephen Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 07 Jan 2022 12:07
Last modified: 23 Feb 2023 02:34

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Contributors

Author: B. I. Moat
Author: David Smeed
Author: Charlotte Marcinko
Author: S. Popinet
Author: Stephen Turnock ORCID iD
Author: Martin Palmer

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