Flow-Induced Vibration in Piping Systems
Abstract
Flow-Induced Vibration (FIV) is a commonly observed phenomenon encountered in
many engineering applications, particularly in the context of pipeline systems. The
interaction between fluid flow and structural elements such as pipes can cause
vibrations, which may contribute to fatigue failure with time. Accurate prediction
methods for natural frequency and critical velocity are essential due to the significant
impact they have on pipeline reliability.
This project's primary aims were to evaluate Finite Element Analysis (FEA)
models' ability to estimate the natural frequency and critical velocity of a simply
supported pipes conveying fluid without considering the Coriolis force term in the
equation of motion. the second aim was to use Finite Difference Analysis (FDA) for
similar predictions and compare it to FEA models. The project focused on simply
supported pipes, ensuring free vibration, and considered different pipe materials.
Two numerical approaches were used: Finite Element Analysis (FEA) and Finite
Difference Analysis (FDA). For the FE model, an equation of motion eliminating the
Coriolis force term was used to assess the impact of this term on predictive accuracy.
The results showed that eliminating the Coriolis force term increased critical
velocity predictions. In particular, the FE model including the Coriolis force term from
previous studies predicted critical velocity better. Both FE-models, including Coriolis
force term or not , predicted the natural frequency identically.
FDA determined pipe stability, natural frequency, and critical velocity in the
second aim. FDA predicted critical velocity better than FEA, especially for stiffer
materials. FDA and FEA models predicted natural frequency similarly for all
materials.
This project compares FEA and FDA accuracy to understand Flow-Induced
Vibration in pipeline systems. It investigates the effects of removing the Coriolis force
from term equations of motion. More complex boundary conditions may improve
these findings in future studies.
Description
Keywords
Flow-Induced Vibration, Finite Element Analysis, Finite Difference Analysis, Pipe stability, Natural Frequency, Critical Velocity, Coriolis Force