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Discrete vortex methods for the simulation of boundary layer separation effects on worker exposure.

Authors
Flynn-MR; Miller-CT
Source
Ann Occup Hyg 1991 Feb; 35(1):35-50
NIOSHTIC No.
00199179
Abstract
Research was conducted to develop a computer model to solve the governing equations of fluid mechanics for the time dependent air flow around a worker immersed in a uniform free stream. The essential feature of the model was the ability to capture the formation and evolution of the near wake, reverse flow zone, and thus to permit the industrial hygiene engineer to examine the influence of changing the direction of air flow, worker position, and air speed on the position and size of this zone. The model, as developed, required substantial computer resources to examine the vortex shedding phenomenon. Modifications to improve speed and accuracy were noted to be under evaluation. This discrete vortex method was employed in this model. The method was able to simulate effectively the time dependent flow phenomenon of vortex shedding past an elliptical cylinder. This simulation was a valuable tool in understanding how the recirculation zone forms and changes periodically in time. This two dimensional approach yielded estimates of concentration that were in reasonable agreement with measured values, although further validation and study are needed to refine and improve the model. The discrete vortex method had an important advantage over finite difference and finite element approaches in that it avoided the problem of numerical viscosity associated with small grid sizes.
Keywords
NIOSH-Publication; NIOSH-Grant; Control-technology; Airborne-particles; Airborne-dusts; Toxic-gases; Air-flow; Air-quality-monitoring; Exhaust-gases; Industrial-hygiene; Computer-models; Fluid-mechanics
Contact
Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
CODEN
AOHYA3
Publication Date
19910201
Document Type
Journal Article
Funding Amount
113206
Funding Type
Grant
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002392
Issue of Publication
1
ISSN
0003-4878
Priority Area
Control-technology
Source Name
Annals of Occupational Hygiene
State
NC
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
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