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Three-dimensional finite-element simulation of a turbulent push-pull ventilation system

M R Flynn1, K Ahn, C T Miller

  • 1Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill 27599-7400, USA.

The Annals of Occupational Hygiene
|October 1, 1995
PubMed
Summary

This study simulates 3D airflow in a push-pull ventilation system using a finite-element method. The simulation accurately predicts velocity fields and jet trajectories, aiding in understanding cross-draught impacts.

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Area of Science:

  • Fluid dynamics
  • Computational fluid dynamics (CFD)
  • Ventilation engineering

Background:

  • Push-pull ventilation systems are crucial for controlling airflow in various environments.
  • Understanding the impact of cross-draughts on these systems is essential for optimizing performance.
  • Accurate simulation of airflow is needed to predict system behavior.

Purpose of the Study:

  • To simulate the three-dimensional velocity field of a push-pull ventilation configuration.
  • To investigate the influence of cross-draughts on the ventilation system.
  • To assess the utility of a finite-element formulation for such simulations.

Main Methods:

  • Employed a finite-element formulation with a penalty approach for continuity.
  • Coupled analytic length scale expressions and turbulent kinetic energy transport equations with momentum equations.

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  • Utilized hot-film anemometry and smoke-wire flow visualizations for validation.

    • Main Results:

    • Numerical predictions showed reasonable agreement with experimental data for jet trajectories and velocities.
    • Turbulence kinetic energy predictions were less accurate, especially near the hood face.
    • The simulation successfully captured the general airflow patterns.

    Conclusions:

    • The finite-element method provides a useful tool for assessing cross-draught impacts on push-pull ventilation.
    • Further refinement may be needed for precise turbulence kinetic energy prediction.
    • The study validates the simulation approach for design and analysis.