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 18 of 18 for “"Elastic forces"”.
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Analysis of aero-elastic forces in labyrinth seals and the design of an experimental facility to measure them
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics.
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The Stability Properties of Some Rheological Flows
… for a wide range of viscous and viscoelastic fluids. The effect of inertia, elasticity, temperature gradients, viscous heating and Biot boundary conditions are of particular interest. Both destabilisation and bifurcation phenomenon are found.<br/>For Newtonian constant viscosity flow …
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Inertio- and Elasto-Magnetic Fractionation of Multiple Microparticles in Newtonian and Non-Newtonian Fluid
… magnetophoresis, inertial focusing and elastic focusing approaches with the concept of pinched flow fractionation. We have taken advantage of inertia, magnetic, drag, and elastic forces to achieve high throughput multiplexed microparticle fractionation. The technique has been tested with …
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A study of a flapping flag in viscoelastic fluids and its implications for micro-scale swimming in biofluids
… method of propulsion when in viscous, viscolelastic fluids rather than Newtonian fluids. By studying the dynamics of a flag under a flow of a viscoelastic fluid, we hope to better understand the swimming dynamics in these biological fluids. A slender polysiloxane rod was placed in a rotating …
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Electrohydrodynamic Simulations of Capsule Deformation Using a Dual Time-Stepping Lattice Boltzmann Scheme
<p>Capsules are fluid-filled, elastic membranes that serve as a useful model for synthetic and biological membranes. One prominent application of capsules is their use in modeling the response of red blood cells to external forces. These models can be used to study the cell’s material properties …
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Dispersive phonon imaging in III-V semiconductors
… imaging in providing new information about the elastic forces between atoms in crystals."
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Wing flexibility and design for animal flight
… contributions of fluid-dynamic and inertial-elastic forces to passive wing deformations by comparing bending in fresh Manduca wings flapped in normal air versus helium (15% air density). I find that a substantial reduction in air density produces only slight changes in bending patterns, and …
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The dynamics of ultrafast motion in biological and bio-inspired systems: the case study of click beetles
… and dynamics are analyzed to identify the forces driving the ultrafast energy release and how power flows throughout the click beetle body. In this work, the key morphology of click beetle species of various shapes and sizes is imaged and quantified using environmental scanning electron …
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Experimental and Computational Modelling of Tissue Rheology and Mechanics in Morphogenesis
… the role of cell material properties, mechanical forces and boundary conditions on tissue deformation rates. In the first chapter, we introduce the model with a particular focus on mechanical force balance and cell-cell dynamics, including elastic forces due to deformation, viscous dissipation due …
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A CFD/CSD Interaction Methodology for Aircraft Wings
… of the coupling between aerodynamic loads and elastic forces. Since aeroelastic effects can contribute significantly to the design of these aircraft, there is a strong need in the aerospace industry to predict these aero-structure interactions computationally. To perform static aeroelastic …
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Eulerian modelling and computational fluid dynamics simulation of mono and polydisperse fluidized suspension
… laying emphasis on the buoyancy, drag and elastic forces. We analyze critically several constitutive relations used to express these forces, we identify their shortcomings and we advance new, and more accurate, closure equations. To validate them we study, analytically and computationally, …
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Modeling of magnetorheological elastomers
… investigate the interplay between magnetic and elastic forces in a two particle system. Results from this model show particle motion on the scale of the particle size, the role of particle clustering in magnetic hysteresis in these systems, and a pinched magnetic hysteresis loop shape that …
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Anomalous diffusion in anisotropic media
… of further defects and microscopic cracks due to elastic forces from the network. The network tends to restore its original shape of a coil and becomes the dominating factor in the coupled system of mesophase and polymer network above this temperature range. The anisotropy of diffusion for D2O on …
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Competing polar and nonpolar distortions and phase transitions in low-dimensional materials
… competition between the interlayer van der Waals forces and intralayer elastic forces, which can be recognized as polar domains due to the local spontaneous polarization in bilayers without centrosymmetry. We propose a theoretical model which captures the effect of an applied electric field on the …
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Biomechanical characterization and computational modeling of the anterior eye
… contour is determined by the balance of three forces: muscular contractions, iris elastic responses, and hydrodynamic forces. The iris muscular forces arise from activation of the iris constituent muscles while the elastic forces are the result of passive mechanical behavior of the iris. Unlike …
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Surface Deformations of Magnetic Continua in Homogeneous Fields
… continuously increases due to the viscoelastic properties of the gel. Both phenomena can well be described by a harmonic oscillator model, where the spring constant changes with time. From the deformation parallel and perpendicular to the applied field, Poisson´s ratio can be calculated, …
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NUMERICAL METHODS FOR MULTIPHASE FLOWS: FROM A SIMPLIFIED INCOMPRESSIBLE BAER-NUNZIATO MODEL TO A UNIFIED THEORY OF COMPRESSIBLE MULTIPHASE FLUID AND SOLID MECHANICS
… of constituents. Furthermore, the Eulerian hyperelasticity equations of Godunov and Romenski (GPR) are used to introduce viscous and elastic forces. These Eulerian equations of solid mechanics are characterised by algebraic relaxation source terms that are capable of extending the applicability …