Techno Press

Wind and Structures   Volume 1, Number 1, March 1998, pages 59-67
Instability of pipes and cables in non homogeneous cross-flow
Jorge D. Riera and J.L.V. Brito

Abstract     [Full Text]
    The vibrations of bodies subjected to fluid flow can cause modifications in the flow conditions, giving rise to interaction forces that depend primarily on displacements and velocities of the body in question. In this paper the linearized equations of motion for bodies of arbitrary prismatic or cylindrical cross-section in two-dimensional cross-flow are presented, considering the three degrees of freedom of the body cross-section. By restraining the rotational motion, equations applicable to circular tubes, pipes or cables are obtained. These equations can be used to determine stability limits for such structural systems when subjected to non uniform cross-flow, or to evaluate, under the quasi static assumption, their response to vortex or turbulent excitation. As a simple illustration, the stability of a pipe subjected to a bidimensional flow in the direction normal to the pipe axis is examined. It is shown that the approach is extremely powerful, allowing the evaluation of fluid-structure interaction in unidimenstional structural systems, such as straight or curved pipes, cables, etc, by means of either a combined experimental-numerical scheme or through purely numerical methods.
Key Words
     linearized equations of motion; uniform cross-flow; quasi static assumption; vortex excitation; fluid-structure interaction.
LDEC/CPGEC/Universida de Federal do Rio Grande do Sul, C.P. 303 Agencia Central, 90001-970-Porto Alegre, RS, BrazilrnENC/FT, Fundcao Universidade de Brasilia, Brasilia, DF, Brazil

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