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Application of CFD and FEA coupling to predict dynamic behaviour of a flexible barge in regular head waves

Application of CFD and FEA coupling to predict dynamic behaviour of a flexible barge in regular head waves
Application of CFD and FEA coupling to predict dynamic behaviour of a flexible barge in regular head waves

The ever increasing size of ships and offshore platforms has resulted in ‘softer’ hull which require hydroelastic effects to be taken into account when predicting fluid-structure interactions. The majority of such investigations are carried out numerically using potential flow solvers. Although nonlinear potential flow methods are also used, RANS/CFD (Reynolds-averaged Navier-Stokes equations) can fully take into account of nonlinearities. It is important, therefore, to verify and validate the results from such numerical predictions. This paper aims to investigate the symmetric motions and responses of flexible barge in regular waves by coupling RANS/CFD and Finite Element software. The two-way interaction between a fluid solver, Star-CCM+, and a structural solver, Abaqus, is applied by exchanging pressures and nodal displacements more than once every time step, namely implicit coupling scheme. A combination of overset and mesh morphing approaches and finite volume solution to allow for the motions of a body at the free surface is used. The computational results compared with experimental measurements and 2-D linear hydroelastic predictions show good agreement. The discrepancies between the 2-D and CFD/FEA cosimulation arise due to the strong influence of bow and stern radiated waves and the agreement between them improves when the nonlinearities are not as dominant.

0951-8339
308-325
Lakshmynarayanana, P. A.
b6bde7ae-aa54-4c07-89ee-83687b85fbfa
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf
Lakshmynarayanana, P. A.
b6bde7ae-aa54-4c07-89ee-83687b85fbfa
Temarel, P.
b641fc50-5c8e-4540-8820-ae6779b4b0cf

Lakshmynarayanana, P. A. and Temarel, P. (2019) Application of CFD and FEA coupling to predict dynamic behaviour of a flexible barge in regular head waves. Marine Structures, 65, 308-325. (doi:10.1016/j.marstruc.2019.02.006).

Record type: Article

Abstract

The ever increasing size of ships and offshore platforms has resulted in ‘softer’ hull which require hydroelastic effects to be taken into account when predicting fluid-structure interactions. The majority of such investigations are carried out numerically using potential flow solvers. Although nonlinear potential flow methods are also used, RANS/CFD (Reynolds-averaged Navier-Stokes equations) can fully take into account of nonlinearities. It is important, therefore, to verify and validate the results from such numerical predictions. This paper aims to investigate the symmetric motions and responses of flexible barge in regular waves by coupling RANS/CFD and Finite Element software. The two-way interaction between a fluid solver, Star-CCM+, and a structural solver, Abaqus, is applied by exchanging pressures and nodal displacements more than once every time step, namely implicit coupling scheme. A combination of overset and mesh morphing approaches and finite volume solution to allow for the motions of a body at the free surface is used. The computational results compared with experimental measurements and 2-D linear hydroelastic predictions show good agreement. The discrepancies between the 2-D and CFD/FEA cosimulation arise due to the strong influence of bow and stern radiated waves and the agreement between them improves when the nonlinearities are not as dominant.

Text
Application of CFD and FEA coupling on a flexible barge-LPA and PT - Accepted Manuscript
Restricted to Repository staff only until 25 February 2020.
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More information

Accepted/In Press date: 10 February 2019
e-pub ahead of print date: 25 February 2019
Published date: 1 May 2019

Identifiers

Local EPrints ID: 429484
URI: https://eprints.soton.ac.uk/id/eprint/429484
ISSN: 0951-8339
PURE UUID: c250a311-8870-43ab-b5b8-36e7e7bc55d1
ORCID for P. Temarel: ORCID iD orcid.org/0000-0003-2921-1242

Catalogue record

Date deposited: 27 Mar 2019 17:30
Last modified: 02 May 2019 00:38

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