Computer simulation of push-pull systems.
Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina 1993 Dec; :1-70
A three dimensional finite element code was developed to estimate jet trajectories for push pull ventilation systems in crossdrafts. A system with a square jet of dilute tracer gas directed toward a square hood with a crossdraft perpendicular to their common centerline axis was modeled. Computer predicted velocity vectors and tracer concentrations were tested by using hot film anemometry, hood capture efficiency measurements, jet trajectory visualization, and measurements of the tracer concentration field. The findings of the study suggested that reasonable three dimensional velocity simulations can be obtained with an upwind finite element code using a penalty function. However, the prediction of turbulence kinetic energy was not good, possibly because of inadequate turbulence modeling or the need for finer grids. The author concludes that the agreement of the jet trajectory with the simulations was excellent, despite limitations in the size of the problem that this algorithm can address.
NIOSH-Grant; Control-technology; Ventilation-equipment; Ventilation-hoods; Mathematical-models; Simulation-methods
Environmental Sciences & Engr University of North Carolina CB 7400 Rosenau Chapel Hill, NC 27599-7400
Final Grant Report
NTIS Accession No.
Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, North Carolina
University of North Carolina Chapel Hill, Chapel Hill, North Carolina