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Abstract
The influence of different turbulence models used in computational fluid dynamics predictions is studied in connection with room air movement. The turbulence models used are the high Re-number k–e model and the high Re- number Reynolds stress model (RSM). The three-dimensional wall jet is selected for the work. The growth rate parallel to the wall in a three-dimensional wall jet is large compared with the growth rate perpendicular to the wall, and it is large compared with the growth rate in a free circular jet. It is shown that it is not possible to predict the high growth rate parallel with a surface in a three- dimensional wall jet by the k–e turbulence model. Furthermore, it is shown that the growth rate can be predicted to a certain extent by the RSM with wall reflection terms. The flow in a deep room can be strongly influenced by details as the growth rate of a three-dimensional wall jet. Predictions by a k–e model and RSM show large deviations in the occupied zone. Measurements and observations of streamline patterns in model experiments indicate that a rea- sonable solution is obtained by the RSM compared with the solution obtained by the k–e model.
Original language | English |
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Journal | Indoor Air |
Volume | 14 |
Issue number | 3 |
Pages (from-to) | 159-168 |
ISSN | 0905-6947 |
Publication status | Published - Jun 2004 |
Keywords
- Computational fluid dynamics : Turbulence model : k- model : Reynolds stress model : Room air distribution : Three-dimensional wall jet : Growth rate in jets.
- Turbulence Models
- k–e Model
- Reynolds Stress Model
- Room Air Distribution
- Three-Dimensional Wall Jet
- Growth Rate in Jet
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Projects
- 1 Active
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Numerical Prediction of Flow in Ventilated Rooms
Nielsen, P. V., Brohus, H., Heiselberg, P. & Li, Z.
19/05/2010 → …
Project: Research