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Analysis of vortex-induced vibration of riser using Spalart-Almaras model

Vortex-induced vibration is natural phenomena where an object is exposed to moving fluid caused vibration of the object. Vortex-induced vibration occurred due to vortex shedding behind the object. One of the offshore structures that experience this vortex-induced vibration is riser. The riser experi...

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Main Authors: Jaswar, Koto, Junaidi, Abdul Khair
Format: Article
Language:English
Published: Penerbit UTM 2014
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/51845/1/JaswarKoto2014_Analysisofvortex-induced.pdf
http://eprints.utm.my/id/eprint/51845/
http://dx.doi.org/10.11113/jt.v69.3260
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spelling my.utm.518452018-08-27T03:41:23Z http://eprints.utm.my/id/eprint/51845/ Analysis of vortex-induced vibration of riser using Spalart-Almaras model Jaswar, Koto Junaidi, Abdul Khair TJ Mechanical engineering and machinery Vortex-induced vibration is natural phenomena where an object is exposed to moving fluid caused vibration of the object. Vortex-induced vibration occurred due to vortex shedding behind the object. One of the offshore structures that experience this vortex-induced vibration is riser. The riser experience vortex-induced vibration due to vortex shedding caused by external load which is sea current. The effect of this vortex shedding to the riser is fatigue damage. Vortex-induced vibration of riser becomes the main concern in oil and gas industry since there will be a lots of money to be invested for the installation and maintenance of the riser. The previous studies of this vortex-induced vibration have been conducted by experimental method and Computational Fluid Dynamics (CFD) method in order to predict the vortex shedding behaviour behind the riser body for the determination of way to improve the riser design. This thesis represented the analysis of vortex induced vibration of rigid riser in two-dimensional. The analysis is conducted using Computational Fluid Dynamic (CFD) simulations at Reynolds number at 40, 200, 1000, and 1500. The simulations were performed using Spalart-Allmaras turbulent model to solve the transport equation of turbulent viscosity. The simulations results at Reynolds number 40 and 200 is compared with the other studies for the validation of the simulation, then further simulations were conducted at Reynolds number of 1000 and 1500. The coefficient of lift and drag were obtained from the simulations. The comparison of lift and drag coefficient between the simulation results in this study and experiment results from the other studies showed good agreement. Besides that, the in-line vibration and cross-flow vibration at different Reynolds number were also investigated. The drag coefficient obtained from the simulation results remain unchanged as the Reynolds number increased from 200 to 1500. The lift coefficient obtained from the simulations increased as the Reynolds number increased from 40 to 1500 Penerbit UTM 2014 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/51845/1/JaswarKoto2014_Analysisofvortex-induced.pdf Jaswar, Koto and Junaidi, Abdul Khair (2014) Analysis of vortex-induced vibration of riser using Spalart-Almaras model. Jurnal Teknologi (Sciences and Engineering), 69 (7). pp. 9-15. ISSN 0127-9696 http://dx.doi.org/10.11113/jt.v69.3260 DOI: 10.11113/jt.v69.3260
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 TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Jaswar, Koto
Junaidi, Abdul Khair
Analysis of vortex-induced vibration of riser using Spalart-Almaras model
description Vortex-induced vibration is natural phenomena where an object is exposed to moving fluid caused vibration of the object. Vortex-induced vibration occurred due to vortex shedding behind the object. One of the offshore structures that experience this vortex-induced vibration is riser. The riser experience vortex-induced vibration due to vortex shedding caused by external load which is sea current. The effect of this vortex shedding to the riser is fatigue damage. Vortex-induced vibration of riser becomes the main concern in oil and gas industry since there will be a lots of money to be invested for the installation and maintenance of the riser. The previous studies of this vortex-induced vibration have been conducted by experimental method and Computational Fluid Dynamics (CFD) method in order to predict the vortex shedding behaviour behind the riser body for the determination of way to improve the riser design. This thesis represented the analysis of vortex induced vibration of rigid riser in two-dimensional. The analysis is conducted using Computational Fluid Dynamic (CFD) simulations at Reynolds number at 40, 200, 1000, and 1500. The simulations were performed using Spalart-Allmaras turbulent model to solve the transport equation of turbulent viscosity. The simulations results at Reynolds number 40 and 200 is compared with the other studies for the validation of the simulation, then further simulations were conducted at Reynolds number of 1000 and 1500. The coefficient of lift and drag were obtained from the simulations. The comparison of lift and drag coefficient between the simulation results in this study and experiment results from the other studies showed good agreement. Besides that, the in-line vibration and cross-flow vibration at different Reynolds number were also investigated. The drag coefficient obtained from the simulation results remain unchanged as the Reynolds number increased from 200 to 1500. The lift coefficient obtained from the simulations increased as the Reynolds number increased from 40 to 1500
format Article
author Jaswar, Koto
Junaidi, Abdul Khair
author_facet Jaswar, Koto
Junaidi, Abdul Khair
author_sort Jaswar, Koto
title Analysis of vortex-induced vibration of riser using Spalart-Almaras model
title_short Analysis of vortex-induced vibration of riser using Spalart-Almaras model
title_full Analysis of vortex-induced vibration of riser using Spalart-Almaras model
title_fullStr Analysis of vortex-induced vibration of riser using Spalart-Almaras model
title_full_unstemmed Analysis of vortex-induced vibration of riser using Spalart-Almaras model
title_sort analysis of vortex-induced vibration of riser using spalart-almaras model
publisher Penerbit UTM
publishDate 2014
url http://eprints.utm.my/id/eprint/51845/1/JaswarKoto2014_Analysisofvortex-induced.pdf
http://eprints.utm.my/id/eprint/51845/
http://dx.doi.org/10.11113/jt.v69.3260
_version_ 1643653078704979968
score 13.211869

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