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Title: Finite element solutions for transient fluid-structure interaction
Author: Hamdan, Fadi
Awarding Body: Imperial College London (University of London)
Current Institution: Imperial College London
Date of Award: 1993
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The objective of this thesis is to develop numerical tools capable of modelling the nonlinear behaviour of bounded and unbounded transient fluid-structure interaction systems. Towards this end, a numerical approach based on the finite element method was developed and implemented into a general purpose computer program ASAS-NL. Four main developments are reported: (i) The Mixed-Eulerian-Lagrangian description of the continuum has been developed to account for the nonlinear effects of fluid-structure interaction systems and a mesh rezoning scheme derived to be used with it. In addition a predictor-multi-corrector time marching scheme has been used for nonlinear dynamic analysis and implicit temporal integration schemes based on Newmark and a-Bossak methods have been reviewed and implemented. Nonlinear iterative schemes based on the Modified Newton Raphson and full Newton Raphson methods have also been included. (ii) Two-dimensional and axi-symmetric fluid finite elements were developed. The elements are compatible with the Mixed-Eulerian-Lagrangian description of the continuum. In addition the free surface gravity wave (sloshing effect) has been addressed. The purpose of these elements is to model the bounded fluid medium in fluid-structure interaction problems. (iii) Two-dimensional and axi-symmetric Mixed-Eulerian-Lagrangian four-noded sliding interface elements have been developed. The purpose of these elements is to prevent artificial penetration of the fluid into the structure during analysis of fluid-structure interaction problems. (iv) A non-radiating boundary has been developed. This is to be used for modelling the unbounded fluid medium in fluid-structure interaction problems. Furthermore, numerical techniques for modelling shock waves were reviewed and included in the analysis. This new analytical formulation has been applied to several problems for which solutions are available to prove its versatility, accuracy and efficiency and has been shown to give satisfactory results for the cases examined.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Structural engineering Structural engineering Civil engineering Fluid mechanics