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This study conducted the numerical models validated by wind-tunnel experiments to investigate the issues of Re -independence of indoor airflow and pollutant dispersion within an isolated building. The window Reynolds number ( Re   w  ) was specified to characterize the indoor flow and dispersion. The indicators of RRC (ratio of relative change) or DR ( K_DR ) (difference ratio of dimensionless concentration) ≤ 5% were applied to quantitatively determine the critical Re   w  for indoor flow and turbulent diffusion. The results show that the critical Re ( Re  crit ) value is position-dependent, and Re  crit at the most unfavorable position should be suggested as the optimal value within the whole areas of interest. Thus Re  H,crit = 27,000 is recommended for the outdoor flows; while Re  w,crit = 15,000 is determined for the indoor flows due to the lower part below the window showing the most unfavorable. The suggested Re  w,crit (=15,000) for indoor airflow and cross ventilation is independence of the window size. Moreover, taking K_DR ≤ 5% as the indicator, the suggested Re  w,crit for ensuring indoor pollutant diffusion enter the Re -independence regime should also be 15,000, indicating that indoor passive diffusion is completely determined by the flow structures. The contours of dimensionless velocity ( U/U  0 ) and concentration ( K ) against the increasing Re   w  further confirmed this critical value. This study further reveals the Re -independence issues for indoor flow and dispersion to ensure the reliability of the data obtained by reduced-scale numerical or wind-tunnel models.

Numerical studies on issues of Re-independence for indoor airflow and pollutant dispersion within an isolated building