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 “"log law"”.
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A Generalized Log-Law Formulation For a Wide Range of Boundary Roughness Conditions Encountered in Streams
… origin, or plane of zero velocity, by fitting log profiles to streamwise velocity measurements is applicable to a larger range of roughness scales than previously expected. Five different sets of detailed, experimental velocity measurements were analyzed encompassing sediment-scale roughness …
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Open channel turbulent boundary layers and wall jets on rough surfaces
… flows lags far behind the corresponding technology for smooth surfaces. This provides reasonable grounds for additional refined rough wall measurements with the expectation of improving our physical understanding of practically relevant turbulent flows. This thesis reports an experimental …
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Numerical Investigation of turbulent coupling boundary layer of air-water interaction flow
… sub-layer and decreased intercept parameter B in log-law layer, strengthened Reynolds stress and eddy viscosity, together with a stronger production term, decreasing-then-increasing dissipation term and negative turbulent diffusion term in TKE budget.
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Effects of surface roughness on the flow characteristics in a turbulent boundary layer
… freestream velocity. The appropriateness of the logarithmic law and power law proposed by George and Castillo (1997) to describe the mean velocity in the overlap region was also investigated. The present results were interpreted within the context of the Townsend’s wall similarity hypothesis. …
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Effects of boundary roughness on turbulence in uniform open channel flow
… viscous sublayer. Using the data from both the log law and linear viscous sublayer fits allowed for more reliable computations of shear stresses as well as a better understanding of how turbulence behaves over the full range of the flow. Previous studies have documented a phenomenon known as …
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An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects
… the LDV, it was also determined that the semi-log law of the wall is valid for high free-stream turbulence cases, but with different constants than the ones proposed by Coles, where the constants for the high free-stream cases may be dependent on the turbulence intensity. For the first time, …
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Numerical study on internal flow structures of subaqueous density underflows and stratified open-channel flows
… sediment concentration to vary from the standard log law and the Vanoni-Rouse formulation, respectively.
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Development and application of low Reynolds number turbulence models for air-cooled electronics
… on the silicon chip as predicted by Moore's Law. Thermal management techniques, used to dissipate this power, are becoming more and more challenging to design. Air cooling of electronic components is the preferred method for many designs where the air flow is characterised as being in the …
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Investigation of the Influence of Temperature Inversions and Turbulence on Land-atmosphere Interactions for Rolling Terrain
… be collected using eddy covariance micrometeorological methods to measure turbulent fluxes (e.g., sensible heat, moisture, and CO2) and quantify the land-atmosphere exchange. The objectives of this work are to calculate surface fluxes for rolling terrain using observational data collected during …