A comparison of a range of models for dispersion in a partially stratified room

M. Deevy, John Stewart, Z. Ren, N. Gobeau, C.J. Saunders

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A comparative study of models used to predict contaminant dispersion in a partially stratified room is presented. The experiments were carried out in a ventilated test room, with an initially evenly dispersed pollutant. Air was extracted from the outlet in the ceiling of the room at 1 and 3 air changes per hour. A small temperature difference between the top and bottom of the room causes very low air velocities, and higher concentrations, in the lower half of the room. Grid-independent CFD calculations were compared with predictions from a zonal model and from CFD using a very coarse grid. All the calculations show broadly similar contaminant concentration decay rates for the three locations monitored in the experiments, with the zonal model performing surprisingly well. For the lower air change rate, the models predict a less well mixed contaminant distribution than the experimental measurements suggest. With run times of less than a few minutes, the zonal model is around two orders of magnitude faster than coarse-grid CFD and could therefore be used more easily in parametric studies and sensitivity analyses. For a more detailed picture of internal dispersion, a CFD study using coarse and standard grids may be more appropriate.
Original languageEnglish
Pages (from-to)511-519
Number of pages9
JournalEnvironmental Modelling and Software
Issue number4
Publication statusPublished - Jan 2008

ASJC Scopus subject areas

  • Ecological Modelling
  • Environmental Science(all)


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