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 24 for “"LOCAL VELOCITY"”.
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Phase-Space Distributions of Galactic Dark Matter Halos and Implications for Detection
… computation of the phase-space density and velocity distribution of weakly-interacting massive particles, a major class of dark matter particle candidates, in the Milky Way. In particular, the possibility of a non-trivial velocity-dependence in the self-annihilation cross-section from the …
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Shock Wave Dispersion in Weakly Ionized Gas
… amplitude was decreased while the shock wave local velocity was increased in the presence of the discharge. However, there was no apparent evidence of the multiple shock structure or the widening of the shock wave deflection signal, as observed in the d.c. glow discharge [3,5]. The shock wave …
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Viscoelastic Fluid Flow Past a Submerged Spheroidal Body (Birefringence, Free Energy)
… conditions, and (c) fluid elasticity on the local velocity and stress fields. The results of this study indicate that while a submerged spheroid gave rise to strong and highly localized stress fields, an immersed sphere created a stress field of moderate strength extending over larger …
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Nanoparticle-coated polymeric microbubbles for revascularization
… away in the area of drug delivery due to high local velocity, which limits the drug release on the desired site. In this study, we hypothesized that the nanoparticles are able to coat over the microbubble surface spontaneously through van der Waals attraction without any chemical or electrical …
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Aeroacoustic control of landing gear noise using perforated fairings
… and spectral content are dictated by the local velocity past the perforate. The application of perforated fairings to the simplified landing gear model reduces the low frequency noise introduced by the solid fairings to values below the baseline landing gear configuration in both side and …
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An Investigation of Avian Wing Tip Vortex Generation Using a Biomimetic Approach
… and characteristics were investigated. At a flow velocity of 5 m/s (Re ~1.21 x 10<sup>5</sup>), wind tunnel smoke and laser visualization testing highlighted the vortex generation of multiple primary feathers, as well as large-scale flow deviations in the vicinity of the feathers. A total pressure …
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How to Accurately Map the Milky Way with a Billion Sources: A Journey into the Gaia-verse
… uncertainties. My case study of the tilt of the local velocity ellipsoid demonstrates this. Well-constructed distances for the Gaia DR2 RVS sample return a velocity ellipsoid broadly consistent with spherical alignment. Using the reciprocal parallax distance estimator significantly alters the …
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New turbulence models for indoor airflow simulation
… model calculates turbulent viscosity based on local velocity and a length-scale. The near wall models have been developed with the aid of the data of natural and forced convection flows by Direct Numerical Simulation (DNS), while the zero-equation model has been proposed empirically. One of the …
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Computational Analysis of Internal Coral Hydrodynamics
… These physiological processes depend on the local velocity field, local concentration gradients of nutrients and waste, and the turbulent stresses developed on and above the coral surface. Though the large-scale hydrodynamics over coral reefs are well studied, the interior hydrodynamics, …
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An improved volumetric LBM boundary approach and its extension for sliding mesh simulation
… distributed in the affected volume according to local flow information rather than uniformly as in the original volumetric LBM boundary formulation. To realize this, a scattering correction procedure is formulated and added to the originally proposed volumetric LBM boundary scheme framework. In …
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Modeling and control of flexible structures
… in which the actuator force depends only on the local velocity and displacement, are investigated for suppressing traveling waves on a string and on a beam, both with slight material damping. Direct feedback proves superior for the string, as more modes must be controlled than can be handled by …
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Experimental investigation of the fluid velocity distribution in stirred tank reactors equipped with retreat-blade impellers using laser doppler velocimetry
… in any given operation. In this work, the velocity distribution inside the typical glass-lined vessel/impeller system was experimentally quantified using Laser Doppler Velocimetry (LDV), which is a non-intrusive experimental method used to determine the local velocity distribution …
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Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
… the flow physics such as detonation wave velocity, pressure profile, wave structure; however, performing these 3-D simulations is computationally expensive. 2-D simulations are a potential alternative to reduce computational cost. In most RDCs, fuel and oxidizer are injected discretely …
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Pressure Fluctuations in a High-Reynolds-Number Turbulent Boundary Layer over Rough Surfaces of Different Configurations
… and hotwire measurements were made to obtain the velocity and turbulence field. Among the principal findings is the development of two scaling laws for the low frequency pressure fluctuations. Both of these are based on the idea that the defect between the edge velocity and some local boundary …
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Molecular fundamentals of foam fractionation
… conditions. The experiments dedicated to the local velocity of rising air bubbles in solutions were performed in a broad range of BLG concentration, pH and ionic strength. Additionally, rising bubble experiments were done for surfactant solutions in order to validate the functionality of the …
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Time-resolved heat transfer measurements and analysis in the wake region of a cylinder in crossflow
… records of the instantaneous heat flux and the local fluid velocity were obtained at different locations by rotating the cylinder through 180°. Correlations between these signals in the time and frequency domain were also measured. Phase relationships between the unsteady heat transfer …
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A method to estimate wind turbine blade damage and to design damage resilient blades
… just downstream of the leading edge, where local velocity reaches a maximum and the impact angle is shallow. Moreover, particles such as rain drops are associated with fatigue and erosion at the very leading edge and on the upper side of the blade section. Finally, hailstones promote …
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The dynamics of the outer region of wall-bounded turbulence : La dinámica de la zona exterior en la turbulencia de pared
… conditions are substituted by prescribed velocity disturbances that destroy the near-wall energy cycle characteristic smooth-walled flows. In this sense, the present DNSes can be understood as a simulation of a turbulent flow consisting on a core region without a near-wall region. The …
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Structure of 2-D and 3-D Turbulent Boundary Layers with Sparsely Distributed Roughness Elements
… an idealized wing-body junction flow. Detailed 3-velocity-component Laser-Doppler Velocimetry (LDV) and other measurements were carried out to understand and describe the rough-wall flow structure. The measurements include mean velocities, turbulence quantities (Reynolds stresses and triple …
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Hydraulic modelling and flood inundation mapping in a bedrock-confined anabranching network: the Mekong River in the Siphandone Wetlands, Laos
… neighbouring values due to the variation in the local bedrock<br/>roughness and the roughness of intervening alluvial reaches; and, (iii) the hydraulic<br/>roughness of the riparian land cover along the floodplains does not contribute noticeably to<br/>the modelled stage along the river network …
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