Book ChapterDOI
A fluid modeling study of the flow structure and plume impingement on a three-dimensional hill in stably stratified flow
W.H. Snyder,W.H. Snyder,Rex Britter,Rex Britter,J. C. R. Hunt +4 more
- pp 319-329
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In this article, the flow structure around simple three-dimensional obstacles in stably stratified flow is experimentally studied using a large towing tank and the conditions for plume impingement and resulting concentrations are quantified and interpreted.Abstract:
The flow structure around simple three-dimensional obstacles in stably stratified flow is experimentally studied using a large towing tank. Under certain conditions, plumes may impinge directly on an obstacle giving far higher concentrations in comparison with plumes diffusing to the surface. The conditions for plume impingement and resulting concentrations are quantified and interpreted. Requirements for a strong downslope wind in the lee of the obstacle are noted. The results are relevant to winds around hills in a stable atmosphere and local transport and dispersion of pollutants.read more
Citations
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Journal ArticleDOI
The structure of strongly stratified flow over hills: dividing-streamline concept.
William H. Snyder,Roger S. Thompson,Robert E. Eskridge,Robert E. Lawson,Ian P. Castro,J. T. Lee,Julian C. R. Hunt,Yasushi Ogawa +7 more
TL;DR: In this paper, it was shown that a very long tank would be required for steady-state conditions to be established upstream of long ridges with or without small gaps and cast doubt upon the validity of previous laboratory studies.
Journal ArticleDOI
Turbidity currents interacting with three-dimensional seafloor topography
TL;DR: In this paper, the influence of the bottom topography on the front velocity of turbidity currents is investigated, and the scaling law for the maximum bump height over which gravity currents can travel is obtained.
Journal ArticleDOI
Wind tunnel dispersion modelling some recent and not so recent achievements
TL;DR: In this paper, a selection of illustrative examples is used in reviewing wind tunnel and water tank modelling of atmospheric dispersion, the aim being to discuss cases where the laboratory work has been a key factor in developing scientific understanding and instigating further research.
Journal ArticleDOI
Upstream stagnation points in stratified flow past obstacles
Peter G. Baines,Ronald B. Smith +1 more
TL;DR: In this paper, an experimental study has been made of stagnation points and flow splitting on the upstream side of obstacles in uniformly stratified flow, for three obstacle shapes which are, respectively, axisymmetric, and elongated in the across-stream and in downstream directions.
Journal ArticleDOI
Turbulent diffusion from a point source in stratified and neutral flows around a three-dimensional hill—II. Laboratory measurements of surface concentrations
William H. Snyder,J. C. R. Hunt +1 more
TL;DR: In this paper, the surface concentration of a hill when a plume impinges from an upwind source is measured using towing tank and wind-tunnel measurements, and the results are compared with the theories developed in Part I.
References
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Journal ArticleDOI
Experiments on stably and neutrally stratified flow over a model three-dimensional hill
J. C. R. Hunt,William H. Snyder +1 more
TL;DR: In this paper, the authors describe the flow structure observed over a bell-shaped hill with height h (the profile of which is the reciprocal of a fourth-order polynomial) when it was placed first in a large towing tank containing stratified saline solutions with uniform stable density gradients and second in an unstratified wind tunnel.
Journal ArticleDOI
Strongly stratified flow past three-dimensional obstacles
TL;DR: In this paper, an experimental study has been made of the shear flow of stratified fluid of characteristic buoyancy frequency with characteristic speed past a three-dimensional obstacle of height when the Froude number, Fr =, is much smaller than one.
Journal ArticleDOI
On the Steady Flow of a Fluid of Variable Density Past an Obstacle
TL;DR: In this article, a model of steady airflow past a three-dimensional mountain is considered, where the fluid is inviscid and incompressible, and the primary and secondary velocities are found for large Richardson number (proportional to gd?/? dz 0 ).
Journal ArticleDOI
Finite Amplitude Disturbances in the Flow of Inviscid Rotating and Stratified Fluids over Obstacles
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Experiments on stably and neutrally stratified flow over a model three-dimensional hill
J. C. R. Hunt,William H. Snyder +1 more