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Your search keyword '"Mohd Asamudin A Rahman"' showing total 2 results
Start Over Author "Mohd Asamudin A Rahman" Journal ships and offshore structures
2 results on '"Mohd Asamudin A Rahman"'

1. Modified wake oscillator model for vortex-induced motion prediction of low aspect ratio structures

Author

Mohd Asamudin A. Rahman, Jeom Kee Paik, Lee Kee Quen, Wan Norazam Wan Hussin, Fatimah Noor Harun, and Mohd Hairil Mohd

Subjects
Physics, Van der Pol oscillator, Aspect ratio, Mechanical Engineering, Motion (geometry), 020101 civil engineering, Ocean Engineering, 02 engineering and technology, Mechanics, Wake, 01 natural sciences, 010305 fluids & plasmas, 0201 civil engineering, Vortex, Motion prediction, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, Spar
Abstract

Floating structures, such as Spar platform, are likely to experience significant motions while operation due to Vortex-induced Motion (VIM). The main features of VIM include aspect ratio and mass r...

Published
2019

2. Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios

Author

Jeom Kee Paik, Jeremy Leggoe, Mohd Hairil Mohd, Krish P. Thiagarajan, and Mohd Asamudin A. Rahman

Subjects
Physics, Drag coefficient, Computer simulation, business.industry, Mechanical Engineering, 020101 civil engineering, Ocean Engineering, 02 engineering and technology, Mechanics, Computational fluid dynamics, Wake, Supercritical flow, 01 natural sciences, 010305 fluids & plasmas, 0201 civil engineering, Vortex, Physics::Fluid Dynamics, Classical mechanics, 0103 physical sciences, Cylinder, Boundary value problem, business
Abstract

This paper presents a computational fluid dynamics (CFD) study of vortex-induced vibration (VIV) for different aspect ratio (L/D) cylinder. Of particular interest was to measure hydrodynamic forces and numerically investigate the wake behaviour of VIV while varying the aspect ratio. The simulation models represented the actual experimental conditions with idealised free-surface boundary condition to capture the responses from fluid-structure interaction phenomenon. The simulations were performed in the subcritical flow region (7.4×103 < Re < 2×105), corresponding to a range of reduced velocity (Ur) from 2 to 14. The results of the cases studied were discussed and compared with the experimental data to verify the accuracy and validity of the present simulation. The comparisons have shown a similar curved-shape drag coefficient plot, and however underestimated the value of the drag coefficients over the reduced velocity. Additionally, the simulations seemed to capture a higher lift force response compared w...

Published
2015

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