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Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow

Drilling risers used in oil and gas operations are subjected to external loads such as wave and current. One of the phenomena that arise from the external loads is the Vortex-Induced Vibration (VIV), which affects the performance of the riser due to excessive vibration from the vortex shedding. A si...

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Main Authors: Alias, Fatin, Mohd., Mohd. Hairil, Musa, Mohd. Azlan, Kasiman, Erwan Hafizi, A. Rahman, Mohd. Asamudin
Format: Article
Language:English
Published: Penerbit Akademia Baru 2021
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/94307/1/ErwanHafizi2021_FlowPastaFixedandFreelyVibrating.pdf
http://eprints.utm.my/id/eprint/94307/
http://dx.doi.org/10.37934/arfmts.87.3.94104
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spelling my.utm.943072022-03-31T15:29:31Z http://eprints.utm.my/id/eprint/94307/ Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow Alias, Fatin Mohd., Mohd. Hairil Musa, Mohd. Azlan Kasiman, Erwan Hafizi A. Rahman, Mohd. Asamudin TA Engineering (General). Civil engineering (General) Drilling risers used in oil and gas operations are subjected to external loads such as wave and current. One of the phenomena that arise from the external loads is the Vortex-Induced Vibration (VIV), which affects the performance of the riser due to excessive vibration from the vortex shedding. A significant factor influencing the VIV is the design of the drilling riser and its auxiliary lines. Until now, the optimum geometrical size and gap between the auxiliary and the main riser are still very scarcely studied. In this paper, the main objective is to study the effects of the gap ratio (G/D) on the vortex shedding phenomenon on a fixed and freely vibrating riser. The riser system was modelled with a main drilling riser and six auxiliary lines with a constant diameter ratio (d/D) of 0.45 and gap ratio (G/D) = 0 to 2.0 in the laminar flow regime with Reynold Number, Re = 200. The simulations were conducted for Single Degree of Freedom (SDOF) using Computational Fluid Dynamics (CFD) software, Altair AcuSolve. It was found that the freely vibrating riser experienced higher lift and drag forces as compared to the fixed riser due to the synchronization (lock-in) of the shedding vibration and the natural frequencies. The lock-in phenomenon is normally observed on the drilling riser at different current directions. The forces are reduced when G/D is higher. The vortex shedding was significantly reduced for auxiliaries between 0.3 to 1.4. It is confirmed that by modifying the interaction of the vortices in the wake region with auxiliary lines, the hydrodynamic forces will be decreased. Finally, this fundamental study could potentially be used in the designing stage of an optimum drilling riser system by considering significant governing factors. Penerbit Akademia Baru 2021-11 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/94307/1/ErwanHafizi2021_FlowPastaFixedandFreelyVibrating.pdf Alias, Fatin and Mohd., Mohd. Hairil and Musa, Mohd. Azlan and Kasiman, Erwan Hafizi and A. Rahman, Mohd. Asamudin (2021) Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 87 (3). pp. 94-104. ISSN 2289-7879 http://dx.doi.org/10.37934/arfmts.87.3.94104 DOI:10.37934/arfmts.87.3.94104
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Alias, Fatin
Mohd., Mohd. Hairil
Musa, Mohd. Azlan
Kasiman, Erwan Hafizi
A. Rahman, Mohd. Asamudin
Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
description Drilling risers used in oil and gas operations are subjected to external loads such as wave and current. One of the phenomena that arise from the external loads is the Vortex-Induced Vibration (VIV), which affects the performance of the riser due to excessive vibration from the vortex shedding. A significant factor influencing the VIV is the design of the drilling riser and its auxiliary lines. Until now, the optimum geometrical size and gap between the auxiliary and the main riser are still very scarcely studied. In this paper, the main objective is to study the effects of the gap ratio (G/D) on the vortex shedding phenomenon on a fixed and freely vibrating riser. The riser system was modelled with a main drilling riser and six auxiliary lines with a constant diameter ratio (d/D) of 0.45 and gap ratio (G/D) = 0 to 2.0 in the laminar flow regime with Reynold Number, Re = 200. The simulations were conducted for Single Degree of Freedom (SDOF) using Computational Fluid Dynamics (CFD) software, Altair AcuSolve. It was found that the freely vibrating riser experienced higher lift and drag forces as compared to the fixed riser due to the synchronization (lock-in) of the shedding vibration and the natural frequencies. The lock-in phenomenon is normally observed on the drilling riser at different current directions. The forces are reduced when G/D is higher. The vortex shedding was significantly reduced for auxiliaries between 0.3 to 1.4. It is confirmed that by modifying the interaction of the vortices in the wake region with auxiliary lines, the hydrodynamic forces will be decreased. Finally, this fundamental study could potentially be used in the designing stage of an optimum drilling riser system by considering significant governing factors.
format Article
author Alias, Fatin
Mohd., Mohd. Hairil
Musa, Mohd. Azlan
Kasiman, Erwan Hafizi
A. Rahman, Mohd. Asamudin
author_facet Alias, Fatin
Mohd., Mohd. Hairil
Musa, Mohd. Azlan
Kasiman, Erwan Hafizi
A. Rahman, Mohd. Asamudin
author_sort Alias, Fatin
title Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
title_short Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
title_full Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
title_fullStr Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
title_full_unstemmed Flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
title_sort flow past a fixed and freely vibrating drilling riser system with auxiliaries in laminar flow
publisher Penerbit Akademia Baru
publishDate 2021
url http://eprints.utm.my/id/eprint/94307/1/ErwanHafizi2021_FlowPastaFixedandFreelyVibrating.pdf
http://eprints.utm.my/id/eprint/94307/
http://dx.doi.org/10.37934/arfmts.87.3.94104
_version_ 1729703153593483264
score 13.244404

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