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Flow and likely scour around three dimensional seabed structures evaluated using RANS CFD

Flow and likely scour around three dimensional seabed structures evaluated using RANS CFD
Flow and likely scour around three dimensional seabed structures evaluated using RANS CFD
When a structure is placed on the seabed, tidal or other marine current induce areas of flow acceleration and deceleration. This may result in movement of the seabed substrate (often sand) near the structure. It would be useful to be able to assess possible scour. For example when considering the protection of wreck and other marine sites of archaeological interest, or the long term durability of marine renewable and offshore structures mounted on the seabed. The first step in the process of scour calculation is to get a good description of the flow around the structure; next a scour pattern can be estimated. The work which was carried out can be divided in 4 mains parts of increasing complexity. The first objective was to produce and compare results on the well documented case of a surface mounted cube. Next, the conclusions of this first part were use to perform several calculations around a variety of cuboids, the CFD results were compared with experimental data obtained recently by the NOC. The third part was a study of scour around
a modeled wreck, using experimental data from a recent thesis. Finally, full scale measurements of the “unknown wreck” were used to complete the study. This work has shown the possibility to correctly describe the flow around 3D structure with a suited turbulence model (as the Shear Stress Transport model). Concerning scour, it has been shown that the wall shear stress alone was not able to predict satisfactorily the onset scour. The turbulence kinetic energy, which seems to have its weight in the scour process, allows a better estimation of the scour pattern.
seabed structures, CFD, scour
0140-3818
144
University of Southampton
de Hauteclocque, G.
7cf7a6ba-5000-4882-acf1-bc20338b9c10
Dix, J.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Lambkin, D.O.
68a3b16f-2aa1-463c-9f8a-3d942a59dfa7
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
de Hauteclocque, G.
7cf7a6ba-5000-4882-acf1-bc20338b9c10
Dix, J.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Lambkin, D.O.
68a3b16f-2aa1-463c-9f8a-3d942a59dfa7
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce

de Hauteclocque, G., Dix, J., Lambkin, D.O. and Turnock, S.R. (2007) Flow and likely scour around three dimensional seabed structures evaluated using RANS CFD (Ship Science Report, 144) Southampton, GB. University of Southampton 90pp.

Record type: Monograph (Project Report)

Abstract

When a structure is placed on the seabed, tidal or other marine current induce areas of flow acceleration and deceleration. This may result in movement of the seabed substrate (often sand) near the structure. It would be useful to be able to assess possible scour. For example when considering the protection of wreck and other marine sites of archaeological interest, or the long term durability of marine renewable and offshore structures mounted on the seabed. The first step in the process of scour calculation is to get a good description of the flow around the structure; next a scour pattern can be estimated. The work which was carried out can be divided in 4 mains parts of increasing complexity. The first objective was to produce and compare results on the well documented case of a surface mounted cube. Next, the conclusions of this first part were use to perform several calculations around a variety of cuboids, the CFD results were compared with experimental data obtained recently by the NOC. The third part was a study of scour around
a modeled wreck, using experimental data from a recent thesis. Finally, full scale measurements of the “unknown wreck” were used to complete the study. This work has shown the possibility to correctly describe the flow around 3D structure with a suited turbulence model (as the Shear Stress Transport model). Concerning scour, it has been shown that the wall shear stress alone was not able to predict satisfactorily the onset scour. The turbulence kinetic energy, which seems to have its weight in the scour process, allows a better estimation of the scour pattern.

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ssr144_numerical_scour.pdf - Accepted Manuscript
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More information

Published date: September 2007
Keywords: seabed structures, CFD, scour
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 48463
URI: http://eprints.soton.ac.uk/id/eprint/48463
ISSN: 0140-3818
PURE UUID: e7d643cf-fb03-4add-9d34-e7e2a5044bcf
ORCID for S.R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 25 Sep 2007
Last modified: 12 Dec 2021 02:38

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Contributors

Author: G. de Hauteclocque
Author: J. Dix
Author: D.O. Lambkin
Author: S.R. Turnock ORCID iD

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