A zero-equation turbulence model for indoor airflow simulation

A zero-equation turbulence model for indoor airflow simulation At present, Computational-Fluid-Dynamics (CFD) with the ‘standard’ k- ɛ model is a popular method for numerical simulation of room airflow. The k- ɛ model needs a lot of computing time and large a computer. This paper proposes a new zero-equation model to simulate three dimensional distributions of air velocity, temperature, and contaminant concentrations in rooms. The method assumes turbulent viscosity to be a function of length-scale and local mean velocity. The new model has been used to predict natural convection, forced convection, mixed convection, and displacement ventilation in a room. The results agree reasonably with experimental data and the results obtained by the standard k- ɛ model. The zero-equation model uses much less computer memory and the computing speed is at least 10 times faster, compared with the k- ɛ model. The grid size can often be reduced so that the computing time needed for a three-dimensional case can be a few minutes on a PC. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Energy and Buildings Elsevier

A zero-equation turbulence model for indoor airflow simulation

Energy and Buildings, Volume 28 (2) – Oct 1, 1998

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Publisher
Elsevier
Copyright
Copyright © 1998 Elsevier Science S.A. All rights reserved.
ISSN
0378-7788
eISSN
1872-6178
D.O.I.
10.1016/S0378-7788(98)00020-6
Publisher site
See Article on Publisher Site

Abstract

At present, Computational-Fluid-Dynamics (CFD) with the ‘standard’ k- ɛ model is a popular method for numerical simulation of room airflow. The k- ɛ model needs a lot of computing time and large a computer. This paper proposes a new zero-equation model to simulate three dimensional distributions of air velocity, temperature, and contaminant concentrations in rooms. The method assumes turbulent viscosity to be a function of length-scale and local mean velocity. The new model has been used to predict natural convection, forced convection, mixed convection, and displacement ventilation in a room. The results agree reasonably with experimental data and the results obtained by the standard k- ɛ model. The zero-equation model uses much less computer memory and the computing speed is at least 10 times faster, compared with the k- ɛ model. The grid size can often be reduced so that the computing time needed for a three-dimensional case can be a few minutes on a PC.

Journal

Energy and BuildingsElsevier

Published: Oct 1, 1998

References

  • On turbulent flow near a wall
    van Driest, E.R.
  • Phenomenological model for dispersed bubbly flow in pipes
    Nikitopoulos, D.E.; Michaelides, E.E.

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