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Neutrally stable atmospheric flow over a two-dimensional rectangular blockThe phenomena of atmospheric flow over a two dimensional surface obstruction such as a building modeled as a rectangular block are analyzed by an approach using the Navier-Stokes equations with a two equation model of turbulence. The partial differential equations for the vorticity, stream function, turbulence kinetic energy, and turbulence length scale are solved by a finite difference technique. The predicted results are in agreement with the limited experimental data available. Current computed results show that the separation bubble originates from the upper front corner of the block and extends approximately 11.5 block heights behind the block. The decay of the mean velocity along the wake center line coincides almost perfectly with the experimental data. The vertical profiles of the mean velocity defect are also in reasonable agreement with wind tunnel results. Velocity profiles in the mixing region are shown to agree with the error function profile typically found in the shear layer. Details of the behavior of the turbulence kinetic energy and the turbulence length scale are also discussed.
Document ID
19780004685
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Shieh, C. F. (Tennessee Univ. Tullahoma, TN, United States)
Frost, W. (Tennessee Univ. Tullahoma, TN, United States)
Bitte, J. (Tennessee Univ. Tullahoma, TN, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1977
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-CR-2926
M-242
Accession Number
78N12628
Funding Number(s)
CONTRACT_GRANT: NAS8-29584
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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