... CE Database Search | Descriptions | Search Tips | Subject Heading List. Turbulence Measuremen... more ... CE Database Search | Descriptions | Search Tips | Subject Heading List. Turbulence Measurements in Low Froude Number Hydraulic Jumps. by James T. Kirby , John Bakunin , and Pablo Huq pp. 1239-1242 Purchase Information Permissions for Reuse ...
Abstract: A Gaussian plume urban dispersion model is presented, where the horizontal and vertical... more Abstract: A Gaussian plume urban dispersion model is presented, where the horizontal and vertical diffusion coefficients are determined according to the theories of GI Taylor (1921) and Hunt, JCR and AH Weber (1979) respectively. The model is validated with dispersion ...
Journal of Applied Meteorology and Climatology, 2007
The nature and role of the shear layer, which occurs at the level of the average building height ... more The nature and role of the shear layer, which occurs at the level of the average building height in urban canopies, are poorly understood. Velocity data are analyzed to determine the characteristics of the shear layer of the urban canopy, defined as the broad, linear segment of the mean velocity profile in a region of high shear. Particle image velocimetry measurements in a water tunnel were undertaken to resolve velocity profiles for urban canopies of two geometries typical of Los Angeles, California, and New York City, New York, for which the aspect ratios (average building height-to-width ratio) H/wb are 1 and 3, respectively. The shear layers evolve with distance differently: For H/wb = 1 the urban canopy shear layer extends quickly from above the building height to ground level, whereas for H/wb = 3 the urban canopy shear layer remains elevated at the vicinity of the building height, only reaching to a depth of z/H ∼ 0.5 far downstream. Profiles of the mean velocity gradient al...
Characteristics of small vortices were studied in axisymmetric jets wherein the Kolmogorov scale ... more Characteristics of small vortices were studied in axisymmetric jets wherein the Kolmogorov scale was approached by progressively decreasing the Reynolds number while still maintaining turbulent flow. A periodic forcing introduced far upstream of the jet nozzle ensured that the jet was turbulent. A vortex eduction tool was developed and applied to the high-pass filtered 2D velocity field in the axial plane of a turbulent jet while varying Re between 140 and 2600. Vortex population, energy, vorticity, and rms (root-meansquare velocity fluctuations) of the high-pass filtered field were measured to elucidate vortex characteristics. The observed population of vortices decreases dramatically at the Kolmogorov scale. The observed increase in vortex population with decreasing vortex size appears to be in accord with the space-filling argument, in that the vortex population in a two-dimensional domain should grow as R−2. The energy density curve obtained from vortex statistics reproduces the...
... CE Database Search | Descriptions | Search Tips | Subject Heading List. Turbulence Measuremen... more ... CE Database Search | Descriptions | Search Tips | Subject Heading List. Turbulence Measurements in Low Froude Number Hydraulic Jumps. by James T. Kirby , John Bakunin , and Pablo Huq pp. 1239-1242 Purchase Information Permissions for Reuse ...
Abstract: A Gaussian plume urban dispersion model is presented, where the horizontal and vertical... more Abstract: A Gaussian plume urban dispersion model is presented, where the horizontal and vertical diffusion coefficients are determined according to the theories of GI Taylor (1921) and Hunt, JCR and AH Weber (1979) respectively. The model is validated with dispersion ...
Journal of Applied Meteorology and Climatology, 2007
The nature and role of the shear layer, which occurs at the level of the average building height ... more The nature and role of the shear layer, which occurs at the level of the average building height in urban canopies, are poorly understood. Velocity data are analyzed to determine the characteristics of the shear layer of the urban canopy, defined as the broad, linear segment of the mean velocity profile in a region of high shear. Particle image velocimetry measurements in a water tunnel were undertaken to resolve velocity profiles for urban canopies of two geometries typical of Los Angeles, California, and New York City, New York, for which the aspect ratios (average building height-to-width ratio) H/wb are 1 and 3, respectively. The shear layers evolve with distance differently: For H/wb = 1 the urban canopy shear layer extends quickly from above the building height to ground level, whereas for H/wb = 3 the urban canopy shear layer remains elevated at the vicinity of the building height, only reaching to a depth of z/H ∼ 0.5 far downstream. Profiles of the mean velocity gradient al...
Characteristics of small vortices were studied in axisymmetric jets wherein the Kolmogorov scale ... more Characteristics of small vortices were studied in axisymmetric jets wherein the Kolmogorov scale was approached by progressively decreasing the Reynolds number while still maintaining turbulent flow. A periodic forcing introduced far upstream of the jet nozzle ensured that the jet was turbulent. A vortex eduction tool was developed and applied to the high-pass filtered 2D velocity field in the axial plane of a turbulent jet while varying Re between 140 and 2600. Vortex population, energy, vorticity, and rms (root-meansquare velocity fluctuations) of the high-pass filtered field were measured to elucidate vortex characteristics. The observed population of vortices decreases dramatically at the Kolmogorov scale. The observed increase in vortex population with decreasing vortex size appears to be in accord with the space-filling argument, in that the vortex population in a two-dimensional domain should grow as R−2. The energy density curve obtained from vortex statistics reproduces the...
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