Abstr:UFR 3-33: Difference between revisions
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The final investigation includes a deep analysis on the unsteady flow features observed in the vicinity of the hemisphere like horseshoe vortex, recirculation area, hairpin structure or vortex shedding. A detailed discussion of the time-averaged flow field comprising the mean velocity field as well as the Reynolds stresses is also present. Both, experimental and numerical, results are found to be in close agreement. | The final investigation includes a deep analysis on the unsteady flow features observed in the vicinity of the hemisphere like horseshoe vortex, recirculation area, hairpin structure or vortex shedding. A detailed discussion of the time-averaged flow field comprising the mean velocity field as well as the Reynolds stresses is also present. Both, experimental and numerical, results are found to be in close agreement. | ||
[[Image:UFR3-33_graphical_abstract.png|x400px]] [ | [[Image:UFR3-33_graphical_abstract.png|x400px|link=http://qnet-ercoftac.cfms.org.uk/w/images/5/58/UFR3-33_hemisphere_vorticity_magnitude_from_hell.avi]] [http://qnet-ercoftac.cfms.org.uk/w/images/5/58/UFR3-33_hemisphere_vorticity_magnitude_from_hell.avi Download movie] | ||
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Revision as of 08:40, 29 January 2016
Turbulent flow past a smooth and rigid wall-mounted hemisphere
Semi-confined flows
Underlying Flow Regime 3-33
Abstract
The objective of the present contribution is to provide a detailed experimental and numerical investigation on the turbulent flow past a smooth and rigid wall-mounted hemispherical obstacle. For this purpose, the hemisphere (diameter ) is exposed to a thick turbulent boundary layer of the thickness at Re = 50,000. In order to reproduce the desired boundary layer in the experiment a combination of specific fences are placed in the upstream region of the wind tunnel. Detailed measurements of the inflow conditions are realized using laser-Doppler and hot-film probes. Using them numerical inlet data mimicking the experimental inflow conditions are generated. These clearly defined boundary and operating conditions are the prerequisites for a combined experimental and numerical investigation of the flow field relying on the laser-Doppler anemometry and on a large-eddy simulation.
The numerical results are produced by a finite-volume Navier-Stokes solver for block-structured curvilinear grids. A fine wall-resolved mesh is applied resulting from a preliminary study. A parallel analysis is conducted to select a correct subgrid-scale model.
The final investigation includes a deep analysis on the unsteady flow features observed in the vicinity of the hemisphere like horseshoe vortex, recirculation area, hairpin structure or vortex shedding. A detailed discussion of the time-averaged flow field comprising the mean velocity field as well as the Reynolds stresses is also present. Both, experimental and numerical, results are found to be in close agreement.
Contributed by: Jens Nikolas Wood, Guillaume De Nayer, Stephan Schmidt, Michael Breuer — Helmut-Schmidt Universität Hamburg
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