Abstract
Thomson's (1987) Lagrangian stochastic model, which satisfies the well-mixed condition for Gaussian turbulence, is used to predict mean concentrations of tracer particles within a mechanically ventilated airspace where the turbulent air flow is three-dimensional and strongly inhomogeneous. Thomson's model is used in conjunction with the statistical properties of the airflow predicted by the standard k-ε model. Predicted mean concentrations of tracer particles are shown to be in accord with experimental findings. Particularly well predicted are the locations of maximum mean concentrations of tracer particles and the shape of contours of constant mean concentrations of tracer particles. Improved predictions for the gradients in mean tracer-particles concentrations are shown to be obtained when the non-stationarity of the airflow is accounted for.
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