Analysis of Vortex-Induced Vibration of Riser using Spalart-Almaras Model
DOI:
https://doi.org/10.11113/jt.v69.3260Keywords:
Vortex-induced vibration, CFD, turbulent modelAbstract
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.
References
AdiMaimun, M. Mobassher, Yasser M. Ahmad. 2012. Fundamentals of Vortex Induced Vibration Analysis of Marine Riser. Offshore Mechanics and Hydrodynamics, Mechanical–Marine Technology, University Technology Malaysia, Johor, Malaysia.
Berthelsen. 2008. A Local Directional Ghost Cell Approach for Incompressible Viscous Flow Problems with Irregular Boundaries. Journal of Computational Physic. 227.
Feng. 1968. The Measurement of the Vortex Induced Effects in Flow Past Stationary and Oscillating Circular and D-Section Cylinders. The University of British Columbia.
J. T. Klamo. 2007. Effects of Damping and Reynolds Number on Vortex-induced Vibration. California Institute of Technology, Pasadena, California.
J. Deng. 2007. The Flow Between a Stationary Cylinder and a Downstream Elastic Cylinder In Cruciform Arrangement. Department of Mechanics, Institute of Fluid Engineering, Zhejiang University, Hangzhou, China.
J. M. Dahl. 2006. Two-degree-of-freedom Vortex-induced Vibrations using a Force Assisted Apparatus. Department of Mechanical Engineering, Centre for Ocean Engineering, Cambridge, USA.
J. B. Wanderley. 2005. Vortex Induced Loads on Marine Risers. Ocean Engineering Department, Brazil.
Jaswar, M. K. R. A. Razak and C. L. Siow, 2013. Vortex-Induced Vibration of Riser. International Conference on Marine Safety and Environment, Johor Bahru, Malaysia
M. N. Linnick. 2005. A High Order Immersed Interface Method for Simulating Unsteady Compressible Flows on Irregular Domains. Journal of Computer Physics 204.
M. T. Asyikin. 2012. CFD Simulation of Vortex Induced Vibration of a Cylindrical Structure. Department of Civil and Transport Engineering, Norwegian University of Science and Technology,
R. Violette. 2007. Computational of Vortex-induced Vibration of Long Structures Using a Wake Oscillator Model: Comparison with DNS and Experiments. Department of Mechanic, France.
S. Yong. 2007. Vortex Induced Vibrations of Finned Cylinders. Technology Research Department, CNOOC Research, Beijing, China.
W. Wu. 2011. Two-dimensional RANS Simulation of Flow Induced Motion of Circular Cylinder with Passive Turbulence Control. Naval Architecture and Marine Engineering, The University of Michigan,
Z. Y. Pan. 2006. Numerical Simulation of Vortex-induced Vibration of a Circular Cylinder at Low Mass-damping Using RANS Code. Laboratory of Ocean Engineering, China Ship Scientific Research Centre, China,
Zhongjun Yin. 2012. Numerical Simulation of the Damping Influence on Vortex-Induced Vibration. School of Mechanical Engineering, University of Science and Technology, Beijing, China
Downloads
Published
Issue
Section
License
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.
