Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures

Handle URI:
http://hdl.handle.net/10754/559183
Title:
Analysis of the Nonlinear Static and Dynamic Behavior of Offshore Structures
Authors:
Alfosail, Feras ( 0000-0002-5553-4945 )
Abstract:
Understanding static and dynamic nonlinear behavior of pipes and risers is crucial for the design aspects in offshore engineering fields. In this work, we examine two nonlinear problems in offshore engineering field: vortex Induced vibration of straight horizontal pipes, and boundary layer static solution of inclined risers. In the first study, we analyze the effect of the internal velocity of straight horizontal pipe and obtain the vortex induced vibration forces via coupling the pipe equation of motion with the recently modified Van Der Pol oscillator governing the lift coefficient. Our numerical results are obtained for two different pipe configurations: hinged-hinged, and clamped- clamped. The results show that the internal velocity reduces the vibration and the oscillation amplitudes. Also, it is shown that the clamped-clamped pipe configuration offers a wider range of internal velocities before buckling instability occurs. The results also demonstrate the effect of the end condition on the amplitudes of vibration. In the second study, we develop a boundary layer perturbation static solution to govern and simulate the static behavior of inclined risers. In the boundary layer analysis, we take in consideration the effects of the axial stretch, applied tension, and internal velocity. Our numerical simulation results show good agreement with the exact solutions for special cases. In addition, our developed method overcomes the mathematical and numerical limitations of the previous methods used before.
Advisors:
Younis, Mohammad I. ( 0000-0002-9491-1838 )
Committee Member:
Lubineau, Gilles ( 0000-0002-7370-6093 ) ; Samtaney, Ravi ( 0000-0002-4702-6473 )
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program
Program:
Mechanical Engineering
Issue Date:
Jul-2015
Type:
Thesis
Appears in Collections:
Theses; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.advisorYounis, Mohammad I.en
dc.contributor.authorAlfosail, Ferasen
dc.date.accessioned2015-07-08T05:43:55Zen
dc.date.available2015-07-08T05:43:55Zen
dc.date.issued2015-07en
dc.identifier.urihttp://hdl.handle.net/10754/559183en
dc.description.abstractUnderstanding static and dynamic nonlinear behavior of pipes and risers is crucial for the design aspects in offshore engineering fields. In this work, we examine two nonlinear problems in offshore engineering field: vortex Induced vibration of straight horizontal pipes, and boundary layer static solution of inclined risers. In the first study, we analyze the effect of the internal velocity of straight horizontal pipe and obtain the vortex induced vibration forces via coupling the pipe equation of motion with the recently modified Van Der Pol oscillator governing the lift coefficient. Our numerical results are obtained for two different pipe configurations: hinged-hinged, and clamped- clamped. The results show that the internal velocity reduces the vibration and the oscillation amplitudes. Also, it is shown that the clamped-clamped pipe configuration offers a wider range of internal velocities before buckling instability occurs. The results also demonstrate the effect of the end condition on the amplitudes of vibration. In the second study, we develop a boundary layer perturbation static solution to govern and simulate the static behavior of inclined risers. In the boundary layer analysis, we take in consideration the effects of the axial stretch, applied tension, and internal velocity. Our numerical simulation results show good agreement with the exact solutions for special cases. In addition, our developed method overcomes the mathematical and numerical limitations of the previous methods used before.en
dc.language.isoenen
dc.subjectVortex induced Vibrationsen
dc.subjectVan Der Pol Oscillatoren
dc.subjectBoundary Layer Petrubationen
dc.subjectInclined Riseren
dc.subjectRiser Static Solutionen
dc.subjectPipe Vibratrationsen
dc.titleAnalysis of the Nonlinear Static and Dynamic Behavior of Offshore Structuresen
dc.typeThesisen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
thesis.degree.grantorKing Abdullah University of Science and Technologyen_GB
dc.contributor.committeememberLubineau, Gillesen
dc.contributor.committeememberSamtaney, Ravien
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.nameMaster of Scienceen
dc.person.id129140en
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