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 83 for “"Hydrodynamic forces"”.
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Surface and Hydrodynamic Forces in Wetting Films
… other is to directly determine the interaction forces using the force apparatus for deformable surfaces (FADS) developed in the present work. The former is designed to obtain spatiotemporal profiles of unstable wetting films by recording the optical interference patterns. The kinetic information …
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Modulation Of Hydrodynamic Forces On Oscillating Submerged Structures In Viscous Fluids
… of submerged devices primarily depends on the hydrodynamic forces experienced by the submerged structure resulting from the fluid-structure interactions. In turn, such forces are correlated to power dissipation occurring during underwater oscillations. The added mass and hydrodynamic damping …
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Combining optical and hydrodynamic forces for single cell characterization, isolation and delivery
… interest from bulk samples, precise and directed forces on the order of picoNewtons are necessary. To generate these forces, we combine optical and hydrodynamic methods enabled by microfluidic platforms that operate in regimes where viscous forces dominate and hydrodynamics is readily predicted …
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The role of hydrodynamic forces in synchronisation and alignment of mammalian motile cilia
… and with cilia models, proposed that hydrodynamic interactions between cilia could provide a physical mechanism for their coordination. In contrast, others have proposed a role of the cytoskeletal elastic coupling between cilia. While previous works mainly focused on algae and …
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Computation of higher-order hydrodynamic forces on ships and offshore structures in waves
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1999.
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SPH Modeling of Solitary Waves and Resulting Hydrodynamic Forces on Vertical and Sloping Walls
… research is needed to estimate the magnitude of forces exerted on structures by such bores. This research presents results of a numerical model based on the Smoothed Particle Hydrodynamics (SPH) method which is used to simulate the impact of extreme hydrodynamic forces on shore protection walls. …
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A model for analyzing the effects of hydrodynamic forces on cell adhesion in a perfused bioreactor
… limitations of oxygen and other nutrients, large hydrodynamic forces and shear stress can potentially serve as a negative signals in tissue formation and morphogenesis. Shear stress and hydrodynamic forces may inhibit the formation of tissue from single cells by disrupting the integrin-mediated …
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Effect of angular orientation on the hydrodynamic forces acting on a body in a restricted waterway
A slender body theory method developed for a body moving parallel to a wall in shallow water is extended to include angular orientation of the body to the wall. The method satisfies only the zero normal velocity condition on the external boundaries but does not take into account the effect of …
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A three-dimensional technique for predicting first-and second-order hydrodynamic forces on a marine vehicle advancing in waves
… for predicting first- and second-order hydrodynamic forces on a marine vehicle advancing in waves. The theoretical formulation starts with the derivation of the governing equations for the boundary-value problem of potential flow and its consequence leads to linearised radiation and …
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Qualitative and Quantitative Study of the Flow Physics in the Vicinity of an Oscillating Plate in Viscous Fluids
… interaction mechanisms responsible for the hydrodynamic forces acting on the plate. The primary objective of this study is to understand the effect of the parameters of oscillation on the resulting flow pattern and analyze their relation to the hydrodynamic forces. More specifically, we …
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Free Elastic Plate Impact into Water
… the separation points are coupled. We found that hydrodynamic forces on an elastic body can be significantly different from those on a rigid body. In particular, the elasticity of the body can promote cavitation and ventilation. It is shown that horizontal speed of the body increases the …
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Time domain simulation of hydroelastic response of ships in large amplitude waves
… linear hydroelasticity analysis. The nonlinear hydrodynamic forces are due to changes in added mass and damping coefficients, as well as restoring and incident wave forces, all evaluated over the instantaneous wetted surface. Non-linear forces due to slamming (bottom impact and flare) and green …
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Lagrangian Mechanics Modeling of Free Surface-Affected Marine Craft
… been restricted by the complex nature of the hydrodynamics. The principal challenge is that the vehicle motion is coupled to the ambient fluid motion, effectively requiring one to solve an infinite dimensional set of equations to predict the hydrodynamic forces and moments acting on a marine …
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Wave forces on submarine pipelines : a review
In Part I theoretical aspects of hydrodynamic forces on immersed solids are considered. Part II contains a chronological review of research projects, laboratory as well as ocean experiments, which have been carried out since 1950. In Part III the recommended procedures, which emerge from Part. II, …
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Lift and drag forces on a submarine pipeline in steady flow
… describes an experimental investigation into the hydrodynamic forces induced on a cylinder placed transversely to a steady stream. Various cylinder locations near the bed of a water flume were considered. The work relates to pipeline design. The various flow phenomena around a cylinder are …
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Cyclostationary Random Vibration of a Ship Propeller and a Road Vehicle
… the case of the ship propeller, we calculate the hydrodynamic forces acting on the propeller using the vortex panel method and the vortex theory of propeller. Considering the randomness in the axial and the tangential components of velocity, we calculate the mean and the covariance of the forces. …
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Fish fins and fast-starts: Multi-level analyses reveal functional variation within median fins of bluegill sunfish.
… surfaces by which fish can generate and react to hydrodynamic forces during a variety of locomotor behaviors. Within the ray-finned fish, the unique segmented, bilaminar design of their fin rays, for which they are named, provide the fish with the ability to independently control the degree of …
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Investigation of a trapezoidal microchannel for hydrodynamic detachment of cells or biomolecules.
… (NSA) methods and cell adhesion studies both use hydrodynamic forces to detach biomolecules or cells. To address the limitations in current microfluidic detachment assays and NSA removal methods, a trapezoidal microchannel was investigated as a hydrodynamic method of cell or biomolecule …
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A study on passive methods of vortex induced vibrations suppression
… behavior around the structure to mitigate the hydrodynamic forces that cause VIV were considered. Structural enhancements to a cylinder were attempted to accomplish this goal. The study also aimed to reduce drag below that encountered for a bare cylinder in comparable flow in addition to …
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Dynamic Model of a Small Autonomous Hydrofoil Vessel
… model is adjusted to reflect the measured hydrodynamic forces in the tow tank tests. Utilizing the modified dynamic model to simulate the vehicle motion, an initial height controller is designed and tuned in field trials until stable foiling state was achieved. We evaluate the field results …
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