Simulation Of Fluid-structure Interaction For
An Elastic Cylinder In An Axial Flow
Author(s)
Z. G. Liu, Y. Liu & J. Lu
Abstract
The fluid-structure interaction for an elastic cylinder in an axial flow was studied
numerically with the ALE method and the LES turbulence model. The
commercial CFD software Fluent is used as the fluid solver and the Euler-
Bernoulli beam solver is embedded into Fluent by its user defined functions
(UDF). Two types of cylinder are included in this study. The motion for the first
type of cylinder is constrained in one lateral direction and for the second in two
lateral directions. The two types of cylinder are both released from their
equilibrium state. When the stiffness is kept large enough, only weak oscillatory
is induced by the flow. However, the motion of the cylinder induced by the flow
may become unstable in the form of either buckling or oscillatory, when the
stiffness becomes small enough. In this study, it is found that with the same
simulation parameters the first type of cylinder is buckled and the second has an
oscillatory. When buckled, the cylinder is located at a new state with weak
oscillatory. The oscillatory after the instability has much larger amplitude than
that before the instability.
Keywords: CFD, fluid-structure interaction, fluidelastic instability, buckling,
flutter.
1 Introduction
One of the most classical subjects in fluid mechanics is the flow over cylinder,
by which many interesting and significant phenomena are discovered such as
Karman vortex streets [1] and also by which, for example, one can get the Kutta-
Joukowski theorem, one of the most basic theorems in aerodynamics [2].
Keywords
CFD, fluid-structure interaction, fluidelastic instability, buckling,
flutter.
Related Book
Other papers in this volume
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