Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Flow-induced vibration"”.
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Interaction of cylinders In proximity under flow-induced vibration
… is validated with benchmark test cases of the flow past an isolated cylinder in both the stationary and flexibly mounted configurations. The study examines a parametric space spanning 6 center-to-center spacing configurations in the range 1.5D-4D and 13 equispaced reduced velocities in the …
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CFD modelling of flow-induced vibration under multiphase flow regimes.
Internal multiphase flow-induced vibration (MFIV) in pipe bends poses serious problems in oil and gas, nuclear and chemical flow systems. The problems include: high amplitude displacement of the pipe structure due to resonance; fatigue failure due to excessive cyclic stress, induced by fluctuating …
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Understanding flow-induced vibration via a physics-constrained, data-driven approach
Vortex-induced vibration (VIV) of long flexible cylinders involves a large number of physical variables, such as Strouhal number, Reynolds number, and damping. Due to the nonlinearity and high-dimensionality of the problem, current VIV prediction models have large error bounds, and require …
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Large Eddy Simulation Based Turbulent Flow-induced Vibration of Fully Developed Pipe Flow
Flow-induced vibration caused by fully developed pipe flow has been recognized, but not fully investigated under turbulent conditions. This thesis focuses on the development of a numerical Fluid-Structure Interaction (FSI) model that will help define the relationship between pipe wall vibration and …
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Flow-induced vibration of a non-constant tension cable in a sheared flow
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1988.
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The effects of staggered buoyancy modules on flow-induced vibration of marine risers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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High frequency dynamic response of marine risers with application to flow-induced vibration
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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Reduction of the flow induced vibration response of a marine cable by altering the cable boundary conditions
Thesis (Mech.E)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Using superposition of undamped modes to model non-orthogonally damped systems
In many structural vibration problems non-orthogonal damping leads to coupling between modes, rendering simple normal mode superposition solutions not sufficiently accurate. The flow-induced vibration of drilling and production risers used in the offshore petroleum industry is an example of such a …
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HIGH-FIDELITY MODELING AND PHYSICS OF BIO-INSPIRED MORPHING AND FLAPPING WINGS
… involving aeroelastic mode selection, flow-induced vibration and mode transition associated with flow-excited instability, flexible membranes immersed in unsteady flows over a wide range of parameter space are examined. Three-dimensional flapping wings with varying flexibility and …
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Electro-magnetic control of cylinder wake
… control algorithms for manipulating wake flows past a solid cylinder in an electrically low-conducting fluid (e.g. seawater). The intent is to avoid both vortex shedding and flow separation from the body. It is desired to reduce the mean drag significantly and prevent the lift from …
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CFD Analysis of Aspirator Region in a B&W Enhanced Once-Through Steam Generator
… steam generator downcomer models, and flow induced vibration analyses. The OpenFOAM CFD software package was used to develop the three-dimensional model of the EOTSG aspirator region, perform the calculations, and post-process the results. Through a series of cases, each improving upon …
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Crashworthiness optimization of ultralight metal structures
… and transfer matrix methods in marine riser vibration. Marine risers possess a predominant chain topology. The transfer matrix method is appropriate for the analysis of such structures. Wave transmission and reflection matrices are formulated in terms of transfer-matrix elements. The …
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The flow of power in the vortex-induced vibration of flexible cylinders
… power-out regions of long cylinders exposed to flow-induced vibration. The data used to illustrate the techniques come from a set of vortex-induced vibration model tests conducted by Shell Oil Co in 2011 at the Marintek facility in Trondheim, Norway. The identification of power-in regions allows …
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Two-dimensional Wakes and Fluid-structure Interaction of Circular Cylinders in Cross-flow
… and thermal engineering. In this work, a flowing soap film was used to investigate the wakes of multiple stationary circular cylinders and of a single oscillating cylinder. Corresponding computer simulations were also conducted. Vortex formation of a stationary circular cylinder was …
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Nonlinear Models and Geometric Structure of Fluid Forcing on Moving Bodies
… groundwork for future research in the fields of flow-induced vibration, plant and animal biomechanics, and dynamical systems.
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A CFD study of fluid-structure interaction problems for floating offshore wind turbines
… features of the tool, including basic fluid flow solving, modelling of wind turbine aerodynamics, hydrodynamic analysis of a floating structure with its mooring system, dynamic analysis of a riser or mooring line and coupled analysis of flow induced vibration of a flexible beam. The developed …
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LEU-HEU Mixed Core Conversion Thermal-hydraulic Analysis and Coolant System Upgrade Assessment for the MIT Research Reactor
… 6.0 MW to 7.0 MW thermal, and primary coolant flow rate increases from 2000 gpm to 2400 gpm. Detailed analyses were completed for initial LEU core with 22 fuel elements, and demonstrated both neutronic and thermal hydraulic safety requirements are met throughout equilibrium cycles. An …
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Practical Analysis Tools for Structures Subjected to Flow-Induced and Non-Stationary Random Loads
… methods to predict response of sensors due to flow-induced vibrations in a pipe flow. The aim was to develop a tool which would enable an engineer to quickly evaluate the suitability of a particular design for a certain pipe flow application, without sacrificing fidelity. The primary methods, …
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Modelling and analysis of vibrations in flexible cylinders subjected to internal multiphase and external single-phase flows.
… cylinders subjected to internal two-phase slug flows and external vortex-induced vibrations (VIV) by taking into account the geometric and hydrodynamic nonlinearities. Flow-induced vibration (FIV) is a common phenomenon observed in various engineering systems such as heat exchangers, nuclear …