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 64 for “"viscous effects"”.
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Nonlinear Free Surface and Viscous Effects on Underwater Vehicle Maneuvering and Seakeeping
… constrained to deep water motions where surface effects are negligible; however, a number of modeling assumptions that are applicable for deep water motions become invalid when the vessel is in proximity to the air-water interface. This dissertation investigates several aspects for the inclusion …
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Evaluation of viscous effects in crack tip fields in recycled asphalt pavement materials using digital image correlation
… correspondence principle was used to extract viscous and elastic components from the full-field DIC-measured viscoelastic strain and displacement fields. Stress intensity factor and J-integral were used to study the fracture properties, as well as the viscoelastic equivalents. It was seen that …
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Signatures of hydrodynamic transport in an electron system
… manner, in many ways resembling the movement of viscous fluids and leading to surprising collective behaviors. Here we explore how the hydrodynamic behavior manifests itself in the electron transport through nanoscale constrictions. Free electron flows through constrictions in metals are often …
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Numerical prediction of the maneuvering characteristics of submarines operating near the free surface
… surrounding and in the wake of the body where viscous effects are important. The panel code calculates the fluid flow in the far field including the free-surface where viscous effects are negligible. The computational domains used by each code overlap, and it is this overlap that enables their …
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Surface textures and non-Newtonian fluids for decreased friction in full film lubrication
… surface textures in order to determine the effects of asymmetry on friction reduction. Gap controlled experiments with Newtonian fluids were performed on a custom tribo-rheometer in order to measure the normal force production and apparent viscosity reduction due to the surface textures. …
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Machine learning in ocean applications : wave prediction for advanced controls of renewable energy and modeling nonlinear viscous hydrodynamics
… due to the stochastic nature of ocean waves, viscous effects of the flow, nonlinear resonance, etc., and the combination of these factors. Data-driven techniques is an prospective approach complementary to traditional methods to model physical problems since data from experiments, field tests …
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Turbulence Interaction in a Highly Sataggered Cascade-Propulsor Configuration
… (blade blocking effect) was not modeled and the viscous effects were roughly accounted for. This work reveals the capabilities of RDT in predicting the development of turbulence convected through a highly staggered cascade propulsor configuration formed by non-symmetrical airfoils. This present …
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Design of a Low Reynolds Number Propulsion System for an Autonomous Underwater Vehicle
… design level codes capable of predicting the viscous effects of low Reynolds number flow that is experienced by small, slow turning propellers. The methodology consists of determining the minimum induced loss lift distribution for the propeller via lifting line theory, efficient airfoil …
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Viscous-inviscid interaction for incompressible flows over airfoils
… obtained so far in an investigation concerning viscous effects in incompressible flows over airfoils. These effects are taken into account by assuming the existence of a boundary layer which interacts with an external inviscid flow. Numerical methods for solving the inviscid and boundary-layer …
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Comparative Evaluation of Vorticity Transport Modeled Distortions and High-Fidelity ANSYS Solutions Using Modal Assurance Criterion
… increases suggesting the ROM's sensitivity to viscous effects.
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Computational Fluid Dynamics-Informed Analysis of Diaphragm-Free Shock Tubes and Insert Designs
… experiments. The study quantifies geometric and viscous effects by evolving from an idealized diaphragm-controlled inviscid straight shock tube to a viscous wrap-around configuration featuring a retracting plate valve in place of a diaphragm. Different valve opening speeds are assessed at matched …
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Numerical Analysis of Gun Barrel Pressure Blast Using Dynamic Mesh Adaption
… were compared with other available CFD results. Viscous effects of unsteady projectile aerodynamics were studied and conclude that the inclusion of viscous terms is essential for a more realistic mathematical model of the muzzle blast.</p>
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The Effects of Peltier Marking on Semiconductor Growth in a Magnetic Field
… applied magnetic field with the additional effects of Peltier marking. The magnetic field is strong enough that inertial effects can be neglected and that viscous effects are confined to boundary layers. The objective of this research is a first step in the development of a method to …
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A vortex-lattice method for Delta wing aerodynamics
… from the trailing edge. This may be due to the viscous effects in the experiment not modelled in this method. It is also apparent that the size of the wake, trailing and leading edge wakes, is the important factor effecting computation times.
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Development of a helmet liner for protection against blast induced trauma
… this day, the knowledge in the fields of causes, effects and identification of traumatic brain injury is limited. The use of advanced body armor has decreased the number of fatalities from fragments observed in previous military operations, resulting in the increase of non-fatal brain injuries …
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Hydrodynamics of unconventional SWATH vessels in waves
… sense that viscosity has significant non-linear effects on their hydrodynamic parameters. The parametric optimization of the hull shape of these vessels to reduce the total resistance in waves yields an interesting hull form where viscous effects become significant and this kind of problem is …
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Virtual Planar Motion Mechanism Testing of 8:1 Spheroids
… during PMM tests are most heavily influenced by viscous effects, especially cross flow separation. Finally, it is shown where these models break down, owing to the increasing nonlinearity of the flow induced by the harsher motions of large amplitude and/or large frequency tests.
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Full Scale Investigation of Bilge Keel Effectiveness at Forward Speed
… is the one motion that is very dependent upon viscous effects of the fluid. Recently, at David Taylor Model Basin, there have been model experiments where the bilge keels were instrumented in order to directly measure their damping force upon the vessel. To build upon this work and to validate …
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