UFR 2-10 Description: Difference between revisions

Revision as of 12:01, 10 January 2011

Flows Around Bodies

Underlying Flow Regime 2-10

Abstract

Contributed by: Guillermo Palau-Salvador, Wolfgang Rodi, — Universidad Politecnica de Valencia, Karlsruhe Institute of Technology

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 ==== Abstract ====
-The flow past finite-height cylinders mounted on a wall is of considerable practical and
-fundamental fluid mechanics interest. It has numerous applications such as flow past
-cylindrical buildings, stacks or cooling towers, rods in various technical equipment, or
-cylinders used as idealized vegetation or roughness elements in atmospheric boundary layers
-and open-channels. The flow is very rich in featuring a variety of phenomena and is
-particularly complex as it is three-dimensional, highly unsteady and contains several
-interacting vortex systems. It is significantly more complex than the much studied flow past
-long cylinders because of additional end-effects, both on the ground side and on the free-end
-which interact with the vortex shedding that may prevail in the middle portion of the cylinder.
-The Reynolds number is an important parameter already in the long-cylinder case; the
-height-to-diameter-ratio ''h/D'' and the relative boundary layer thickness of the
-approach flow, ''δ/h'', are
-further important parameters in the finite-height case. A variety of experiments have been
-carried out to study the influence of these various parameters and the flow configuration has
-recently become a popular test case for large eddy simulations. The particular test case chosen
-for this UFR is for cylinders with height-to-diameter-ratios ''h/D'' of 2.5 and 5
-and a relatively
-thin approach flow boundary layer having ''δ/h&nbsp;≈&nbsp;0.1''. For these cases detailed LDV
-measurements are available and also visualization studies and LES calculations that will be
-compared with the experiments. The Reynolds number based on approach flow velocity and
-cylinder diameter is 43000 in the ''h/D''&nbsp;=&nbsp;2.5 case and 22000 in the
-''h/D''&nbsp;=&nbsp;5 case.

UFR 2-10 Description: Difference between revisions

Revision as of 12:01, 10 January 2011

Flows Around Bodies

Underlying Flow Regime 2-10

Abstract

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