Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe
Received date: 08 Jul 2011
Accepted date: 10 Oct 2011
Published date: 05 Mar 2012
Copyright
Floating liquefied natural gas (LNG) plants are gaining increasing attention in offshore energy exploitation. The effects of the periodically oscillatory motion on the fluid flow in all processes on the offshore plant are very complicated and require detailed thermodynamic and hydrodynamic analyses. In this paper, numerical simulations are conducted by computational fluid dynamics (CFD) code combined with user defined function (UDF) in order to understand the periodically oscillating pressure characteristics of inviscid flow in the rolling pipe. The computational model of the circular pipe flow is established with the excitated rolling motion, at the excitated frequencies of 1–4 rad/s, and the excitated amplitudes of 3°–15°, respectively. The influences of flow velocities and excitated conditions on pressure characteristics, including mean pressure, frequency and amplitude are systematically investigated. It is found that the pressure fluctuation of the inviscid flow remains almost constant at different flow velocities. The amplitude of the pressure fluctuation increases with the increasing of the excitated amplitude, and decreases with the increasing of the excitated frequency. It is also found that the period of the pressure fluctuation varies with the excitated frequency. Furthermore, theoretical analyses of the flow in the rolling circular pipe are conducted and the results are found in qualitative agreement with the numerical simulations.
Yan GU , Yonglin JU . Numerical simulation and analysis of periodically oscillating pressure characteristics of inviscid flow in a rolling pipe[J]. Frontiers in Energy, 2012 , 6(1) : 21 -28 . DOI: 10.1007/s11708-012-0173-2
Acceleration of kinetic system/(m·s-2) | |
f | Body force/ (N·kg-1) |
fi | Body force component/(N·kg-1) |
BoldItalic | Normal vector |
Pipe segment in kinetic system/m | |
P | Pressure/(N·m-2) |
qw | Heat flux of wall/W |
BoldItalic0 | Vector of origins from inertial and kinetic systems/m |
BoldItalic | Vector in kinetic system/m |
t | Time/s |
T | Temperature of fluid/K |
BoldItalic | Flow velocity/(m·s-1) |
ui | Velocity component/(m·s-1) |
BoldItalicn | Normal velocity/(m·s-1) |
BoldItalicr | Relative velocity/(m·s-1) |
xi | Direction component/m |
Kronecker delta | |
Surface force/(N·m-3) | |
Amplitude of rolling/rad | |
Density/(kg·m-3) | |
Angular velocity/(rad·s-1) | |
Angular velocity of rolling/(rad·s-1) |
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