Global ETD Search
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Showing 1 to 20 of 28 for “"Boundary layer effects"”.
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Tracking algorithms under boundary layer effects for free-space optical communications
… turret, the disrupted airflow at the boundary layer can greatly distort the optical beam. A model of the communication link is created to compare the performance of several tracking algorithms. We investigate the best algorithm under various atmospheric conditions and signal-to-noise …
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Investigation of subsonic boundary layer effects on supersonic-type airfoil sections
… very low Reynolds Numbers. The thickness of the boundary layer is critical at low Reynolds Numbers and causes a decrease in the overpressure region. This, coupled with the fact that the overpressure region increases more with Mach Number than predicted by the theory, could lead to erroneous …
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Cascade performance of a double arc compressor blade at low Reynolds number
… solution technique to solve the freestream and boundary layer for a quasi three-dimensional flow through a blade passage is presented. Experimental results for the velocity distributions along the blade surface, the flow deflection, and the profile loss are compared to the data obtained from the …
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Influence of forced convection on sessile droplet evaporation
… Additional experiments also demonstrate boundary layer effects caused by adjacent droplets suppresses increases to the evaporation rates from forced convection.
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An analysis method for the viscous/inviscid flow around two dimensional multi-element aerofoils including surface roughness effects
… on the panels to represent the aerofoil. Boundary layer effects are included in the calculation by utilizing linear distributions of sources on the panels to model the displacement effects due to the boundary layer. Boundary layer development is calculated using Thwaites' method for the …
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Numerical Investigation of Second-Order Effects in a Supersonic Boundary-Layer
<p>Historically, the study of boundary-layer flows has centered on the analysis of the first-order boundary-layer equations and their application to physical flow problems. However, selected “real-world” boundary-layer flows exhibit significant second-order effects which are neglected by the …
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Warm and cold atmospheric frontogenesis
… demonstrates the significance of the nonlinear effects when the results are compared with the nonlinear model. Nonlinear advections brake the frontogenesis for cold fronts in the model, and are almost entirely responsible for realistic frontogenesis of warm fronts. conceptual models of both warm …
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Supersonic Constricted Plasma Flows
… fluid dynamics and plasma simulations. Boundary layer effects are significant in the rarefied flow within the constricted discharge chamber. A slip boundary condition with the appropriate tangential momentum and thermal accommodation coefficients must be used to produce results that …
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Supersonic Constricted Plasma Flows
… fluid dynamics and plasma simulations. Boundary layer effects are significant in the rarefied flow within the constricted discharge chamber. A slip boundary condition with the appropriate tangential momentum and thermal accommodation coefficients must be used to produce results that …
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Impact of Lens Angle and Nozzle Geometry on Aerodynamic Focusing: A Numerical Study
… They are simple to fabricate and have fewer boundary layer effects as compared to other geometries such as capillaries, converging nozzles, and diverging nozzles. The focusing performance of these other geometries has not been systematically evaluated. This study used computational fluid …
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Potential flow solution and incompressible boundary layer for a two-dimensional cascade
… a recommendation of reference 3, the blade boundary layer effects have been calculated from the velocity distributions of the first part. Considering certain assumptions, these results also may be judged as satisfactory and the rather important conclusion may be drawn that turbulent …
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Pulse de-icing for aircraft applications
… the efficient melting of a thin (<100 µm) ice layer at the aircraft surface in order to limit parasitic heat losses. Only the interface is allowed to melt, with the rest of the ice sliding on the melt lubrication layer due to aerodynamic forces. To study pulse deicing, we develop a transient …
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Magnetohydrodynamic Induction Pump Jet Propuslor for Undersea Vehicles
… Disk Theory (ADT) and incorporates inflow boundary layer effects and hydrodynamic drag to develop a total propulsor efficiency. There was a significant investigation into the mitigation of the finite length effect that has traditionally led to low efficiencies (5%- 45%) in MHD liquid metal …
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From Pine Cones to Minimal Surfaces: The Geometry and Mechanics of Morphing Bilayers
… A subset of this type of growth is that of bilayers, where the Uniform Curvature model has enabled researchers to successfully investigate problems of buckling and multistability. However, owing to the free edge, this model fails to capture higher order effects pertaining to a boundary layer …
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An experimental study of heated jets in a cross-flow from stacks of various geometries
… is a need for further investigation into the effects that such influences have upon the jet development. Two-dimensional particle image velocimetry (PIV) measurements are performed in the plane of symmetry aligned with the cross-flow of the near-field of the jet while stereoscopic PIV (sPIV) …
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Programmable surfaces
… the desired motion and fluidic system. Because boundary layer effects are significant across fluid states from aerodynamics to hydrodynamics to rheology, the possible implications of active control of the boundary layer are correspondingly far reaching, with applications from transportation to …
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Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer
… an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a two-stage process. Via numerical experiment, we explore the sensitivity of sediment transport to …
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Improving turbomachinery loss prediction using high fidelity CFD
… on a compressor cascade's suction surface boundary layer, it is found that much of the error when using the k-ω SST turbulence model is due to incorrect non-equilibrium boundary layer modelling. Using a Design of Experiments based approach, it is found that by reducing β_1, a turbulence …
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The hydraulic transport of high concentration stabilized flow full plant mineral tailings
… : 1. Slip velocity at the pipe wall 2. Wall effects due to particle interaction 3 . Boundary layer effects 4. Plug flow at high concentrations 5. Particle migration away from the wall leaving a sheared annular zone 6. Lateral dispersive stress acting between particle and pipe wall. The …
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Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer
… an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a two-stage process. Via numerical experiment, we explore the sensitivity of sediment transport to …
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