The Lee Power Plant wind tunnel study1  featured releases from steam boiler stacks with a common height of 64.8 m affected by a building tier with a height of 42.6 m. The world's largest fluid modelling study chamber at Monash University in Australia was used for these experiments (see plan view in Figure 1).
Stable meteorological conditions were simulated by using an inverted model of the facility, which was suspended from the ceiling of the tunnel. A stably stratified layer was developed along the tunnel by heating the inflowing air. and a buoyant plume was simulated by using a negatively buoyant gas mixture. A stable potential temperature lapse rate of 0.035 deK/m was modeled with a stack-top real-world equivalent wind speed of 7 m/s, with several wind directions being tested.
In neutral conditions, stack-top speeds (at the 64.8-m level) ranged in real-world equivalents from 5 to 40 m/s. There were 78 combinations of wind direction, wind speed, and plume buoyancy tested for the neutral cases, and 14 combinations for the stable cases.