Three-dimensional finite-element simulation of a turbulent push-pull ventilation system.
Flynn-MR; Ahn-K; Miller-CT
Ann Occup Hyg 1995 Oct; 39(5):573-589
The objectives of this study were to predict the three dimensional velocity field of a simple push/pull configuration and examine these predictions with experimental data. A finite element formulation with penalty approach to enforce continuity was used to simulate the three dimensional velocity field resulting from the push/pull ventilation configuration. The results of the study suggest reasonable three dimensional velocity simulations can be obtained with an upwind finite element code employing the penalty function. The momentum and turbulence kinetic energy equations were solved in coupled form, and produced a large coefficient matrix for solution. The direct solver employed for three dimensional calculations was limiting. Iterative solvers may now be possible with penalty formulations and this should improve the competitiveness of the method with alternate approaches to modeling turbulent flows. In spite of the limitations in the size of the problem that this algorithm can address, the agreement of the jet trajectory with the simulations was good. Agreement of predicted velocity magnitude and direction were reasonable, and the variation in turbulence kinetic energy was large. Further work was underway to improve the capacity of the code in order to evaluate the limitations of the turbulence model.
NIOSH-Publication; NIOSH-Grant; Control-technology; Ventilation-systems; Ventilation-equipment; Air-quality-control; Air-flow; Mathematical-models; Exhaust-ventilation; Simulation-methods
Environmental Sciences & Engr University of North Carolina CB 7400 Rosenau Chapel Hill, NC 27599-7400
Annals of Occupational Hygiene
University of North Carolina Chapel Hill, Chapel Hill, North Carolina