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Discrete Vortex Methods for the Simulation of Boundary Layer Separation Effects on Worker Exposure.

Authors
Flynn-MR; Miller-CT
Source
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 1990 Feb:26 pages
Link
NIOSHTIC No.
00197945
Abstract
A computer model was developed to solve the governing equations of fluid mechanics for the time dependent air flow around a worker immersed in a uniform free stream. A main feature of the model was the ability to capture the formation and evolution of the near wake, reverse flow zone; this made it possible to examine the influence of changing air direction, worker position, and air speed on the position and size of this near wake zone. The direction of air flow with respect to the worker and the contaminant source was an important factor in determining the concentration of pollutant in the breathing zone. The phenomenon of boundary layer separation was responsible for the formation of rotating eddies on the downstream side of the worker. The discrete vortex method was found to effectively simulate the time dependent flow phenomenon of vortex shedding past an elliptic cylinder. This simulation was a valuable tool in understanding how the recirculation zone forms and changes periodically in time. The model required substantial computer resources to examine the vortex shedding phenomenon.
Keywords
NIOSH-Grant; Control-technology; Air-sampling; Air-quality-monitoring; Airborne-particles; Air-flow; Computer-models;
Contact
Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
Publication Date
19900201
Document Type
Final Grant Report;
Funding Amount
113206.00
Funding Type
Grant;
Fiscal Year
1990
NTIS Accession No.
PB91-185249
NTIS Price
A03
Identifying No.
Grant-Number-R01-OH-02392
NIOSH Division
OEP
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Source Name
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
State
NC;
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
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