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 9 of 9 for “"Turbulent pressure"”.
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High Resolution Simulation of Laminar and Transitional Flows in a Mixing Vessel
… action associated with radial impellers under turbulent flow conditions. However, as the Re number decreases, the net radial flow during one impeller revolution was reduced and for the lowest Re number a reciprocating motion with negligible net pumping was observed. In order to elucidate the …
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The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum
… very few studies investigating the rough wall pressure spectra under fully rough flows, which are relevant to many common engineering applications operating within this regime. This investigation uses the Virginia Tech Stability Wind Tunnel to perform experiments on a series of high Reynolds …
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Reducing mechanical and flow-induced noise in the surface suspended acoustic receiver
… velocity dependent flow noise that results from turbulent pressure fluctuations on the hydrophones. A second noise source results from the acceleration sensitivity of the hydrophones in conjunction with high frequency accelerations present in the hydrophone array cable. These high frequency …
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Pressure Shielding Mechanisms in Bio-Inspired Unidirectional Canopy Surface Treatments
Reduction of surface pressure fluctuations is desirable in various aerodynamic and hydrodynamic applications. Over the past few years, studies on canopy surface treatments have been conducted to investigate the fundamental mechanisms of surface pressure attenuation termed as pressure shielding. …
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On the evolution of gaseous haloes in cosmological simulations of galaxy formation
… In the hot halo there is a notable boost in turbulent velocities, leading to a doubling of non-thermal pressure support. With the FABLE suite, I studied how the hydrostatic mass bias and turbulent pressure support level in galaxy clusters change as they undergo major mergers and are host to …
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Pressure Fluctuations in a High-Reynolds-Number Turbulent Boundary Layer over Rough Surfaces of Different Configurations
The pressure fluctuations under a high Reynolds Number, rough-wall, turbulent, boundary layer have been studied in the Virginia Tech Stability Wind Tunnel. Rough surfaces of varying element height (1-mm, 3-mm), shape (hemispheres, cylinders) and spacing (5.5-mm, 10.4-mm, 16.5-mm) were investigated …
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Droplet levitation and underwater plastron restoration using aerophilic surface textures
… are prone to impregnation by water due to turbulent pressure fluctuations from external flows and dissolution of the trapped gas into the water. It is therefore desirable to develop strategies to restore the plastron underwater. A common method used to reduce the contact line pinning of …
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A theoretical study of stellart pulsations in young brown dwarfs
This thesis reports the results of a twofold study on the recently proposed phenomenon of ‘stellar pulsations’ in young brown dwarfs by the seminal study of Palla and Baraffe (2005) (PB05, thereafter). The PB05 study presents results of a non-adiabatic linear stability analysis showing that young …
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Numerical Prediction of Drag Reduction and Interfacial Shapes Over Superhydrophobic Surfaces
… over realistic rough surfaces given an external pressure and surface properties. Both laminar and turbulent regimes are investigated. Direct numerical simulation (DNS) is used to study the drag reduction by superhydrophobic surfaces (SHS) in laminar channel flow. Resolved multiphase simulations …