Wind-Tunnel Modeling of Flow Diffusion over an Urban Complex.

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Abstract:

The purpose of the study was to explore and test the potential of wind-tunnel modeling as an alternative to the more expensive and tedious full-scale urban diffusion experiments. A model of the city of Fort Wayne, Indiana was constructed to a horizontal scale of 1 4000 and studied in an environmental wind tunnel. If the roughness and the heat-island effects are modelled properly, and the approach flows made similar, the flow over the model city was found to conform to that in the field. The pattern of the heat island over Fort Wayne was reproduced almost exactly. Simulation of diffusion from an aerial line source was accomplished by traversing a continuously emitting source of Krypton-85 across the city. The model was found to give same overall picture of the effect of the city on dispersion process as that observed in the field.

Author(s):
Chaudhry, F. H. ; Cermak, J. E.
Author Organization(s):
COLORADO STATE UNIV FORT COLLINS FLUID DYNAMICS AND DIFFUSION LAB
Descriptive Note:
Technical rept.,
Pagination:
0084

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
CER70-71FHC-JEC24, THEMIS-CER-TR-17
Contract/Grant Number(s):
N00014-68-A-0493-0001
Project Number(s):
NR-062-414
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*URBAN AREAS, *ATMOSPHERIC MOTION, *AIR POLLUTION, ATMOSPHERIC MOTION, WIND TUNNEL MODELS, HEAT, DIFFUSION, TURBULENT BOUNDARY LAYER, WIND, SKIN FRICTION, MATHEMATICAL MODELS, URBAN PLANNING, INDIANA
Field(s)/Group(s):
Atmospheric Physics, Air Pollution and Control
Keyword(s):
ATMOSPHERIC DENSITY, DIFFUSION, THEMIS PROJECT, TURBULENT DIFFUSION, EDDIES
Report Date:
1971 May 01