Impact of turbulence anisotropy near walls in room airflow

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Abstrakt

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.
OriginalsprogEngelsk
TidsskriftIndoor Air
Vol/bind14
Udgave nummer3
Sider (fra-til)159-168
ISSN0905-6947
StatusUdgivet - jun. 2004

Emneord

  • Computational Fluid Dynamics
  • Turbulence Models
  • k–e Model
  • Reynolds Stress Model
  • Room Air Distribution
  • Three-Dimensional Wall Jet
  • Growth Rate in Jet

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