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ijcoe 2017, 1(1): 1-7 Back to browse issues page
A Numerical Model of Vortex-Induced Vibration on Marine Risers
hamed ashuri, keyvan sadeghi , saeid niazi
Assistant professor Buein Zahra Technical University
Abstract:   (438 Views)

The Steger and Warming flux vector splitting implicit scheme is used to numerically solve two dimensional Reynolds Averaged Navier–Stokes (RANS) equations governing the vortex induced vibration of a flexible riser laterally supported by a spring and a damper. The k–ε model is used as turbulence model to simulate the turbulent flow in the wake of the riser. To update the new position of the riser, the lift coefficient obtained from the previous RANS iteration is coupled by the body motion equation. The proposed numerical solution is able to provide fair results in terms of lift coefficient, amplitude of oscillation and the effect of reduced velocity on it. The numerical results are compared with the available experimental and computational data where fairly good agreement even at the lock-in regime has been obtained. Taking wider external boundary, using conservative form of the equations, applying k-ε turbulence model for the separated flow and finally using the variable time step as the lock-in region approaches, are main features of the proposed numerical model.

Keywords: vortex-induced vibration, RANS equation, turbulence model, lift coefficient
Full-Text [PDF 917 kb]   (190 Downloads)    
Type of Study: Research | Subject: Computational Fluid Dynamics
Received: 2016/09/10 | Accepted: 2017/03/9 | Published: 2017/05/10
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DOI: 10.18869/acadpub.ijcoe.1.1.1

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ashuri H, sadeghi K, niazi S. A Numerical Model of Vortex-Induced Vibration on Marine Risers. ijcoe. 2017; 1 (1) :1-7
URL: http://ijcoe.org/article-1-23-en.html
Volume 1, Number 1 (5-2017) Back to browse issues page
International Journal of Coastal and Offshore Engineering International Journal of Coastal and Offshore Engineering
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