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Simulating turbulent transition using Large Eddy Simulation with application to underwater vehicle hydrodynamic modelling

Simulating turbulent transition using Large Eddy Simulation with application to underwater vehicle hydrodynamic modelling
Simulating turbulent transition using Large Eddy Simulation with application to underwater vehicle hydrodynamic modelling
Large Eddy Simulation (LES) has been widely used by the aerospace community in order to model laminar separation bubbles and other low Reynolds number phenomena. In maritime-related applications this family of turbulence modelling techniques has typically been used to model unsteady cavitation. Present work aims to apply it to develop first-hand experience with modelling laminar separation bubbles using LES in OpenFOAM, specifically looking at the effects of the choice of the subgrid model. The investigation is carried out on the SD7003 2D foil section, for which PIV flow field measurements, as well as reference CFD results, are available. Four different popular LES models are tested: Smagorinsky, dynamic $k$-equation, wall-adaptive (WALE), and implicit (ILES). The ultimate goal of this work is to apply the established methodology to model flows on underwater vehicle appendages, as well as propellers, which have been reported to experience noticeable amounts of laminar flow when operating at model-scale Reynolds numbers. These flows experience complex, unsteady hydrodynamic phenomena, such as tip and root vortices, laminar separation bubbles, and are affected by onset turbulence. Thus, studying them with LES could lead to improved predictions compared to the previous work by the authors which relied on using RANS transition models to simulate the flow past underwater vehicle geometries.
CFD, Underwater gliders, LES, turbulent transition
Lidtke, Artur K.
5570c46b-09b5-4345-9f5c-7a5ed2a29ffc
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Downes, Jon
ebc0f09b-9d33-4815-bedf-bc77df59c822
Lidtke, Artur K.
5570c46b-09b5-4345-9f5c-7a5ed2a29ffc
Turnock, Stephen R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Downes, Jon
ebc0f09b-9d33-4815-bedf-bc77df59c822

Lidtke, Artur K., Turnock, Stephen R. and Downes, Jon (2017) Simulating turbulent transition using Large Eddy Simulation with application to underwater vehicle hydrodynamic modelling. 20th Numerical Towing Tank Symposium, Netherlands. 01 - 03 Oct 2017. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Large Eddy Simulation (LES) has been widely used by the aerospace community in order to model laminar separation bubbles and other low Reynolds number phenomena. In maritime-related applications this family of turbulence modelling techniques has typically been used to model unsteady cavitation. Present work aims to apply it to develop first-hand experience with modelling laminar separation bubbles using LES in OpenFOAM, specifically looking at the effects of the choice of the subgrid model. The investigation is carried out on the SD7003 2D foil section, for which PIV flow field measurements, as well as reference CFD results, are available. Four different popular LES models are tested: Smagorinsky, dynamic $k$-equation, wall-adaptive (WALE), and implicit (ILES). The ultimate goal of this work is to apply the established methodology to model flows on underwater vehicle appendages, as well as propellers, which have been reported to experience noticeable amounts of laminar flow when operating at model-scale Reynolds numbers. These flows experience complex, unsteady hydrodynamic phenomena, such as tip and root vortices, laminar separation bubbles, and are affected by onset turbulence. Thus, studying them with LES could lead to improved predictions compared to the previous work by the authors which relied on using RANS transition models to simulate the flow past underwater vehicle geometries.

Text
2017 Lidtke A K - Simulating turbulent transition using Large Eddy Simulation with application to underwater vehicle hydrodynamic modelling - Accepted Manuscript
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More information

Published date: 1 October 2017
Venue - Dates: 20th Numerical Towing Tank Symposium, Netherlands, 2017-10-01 - 2017-10-03
Keywords: CFD, Underwater gliders, LES, turbulent transition

Identifiers

Local EPrints ID: 428887
URI: http://eprints.soton.ac.uk/id/eprint/428887
PURE UUID: 6e9f55f2-9f06-49d3-9979-03ef368ef7ff
ORCID for Artur K. Lidtke: ORCID iD orcid.org/0000-0002-2687-3083
ORCID for Stephen R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400
ORCID for Jon Downes: ORCID iD orcid.org/0000-0003-2027-4474

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Date deposited: 13 Mar 2019 19:19
Last modified: 07 Oct 2020 02:05

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