NIOSHTIC-2 Publications Search
Discrete Vortex Methods for the Simulation of Boundary Layer Separation Effects on Worker Exposure.
Flynn MR; Miller CT
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina 1990 Feb:26 pages
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.
NIOSH-Grant; Control-technology; Air-sampling; Air-quality-monitoring; Airborne-particles; Air-flow; Computer-models;
Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
Final Grant Report;
NTIS Accession No.
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
Page last reviewed: February 18, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division