Abstract
A numerical calculation scheme is described for predicting the transport of a passive scalar contaminant through a turbulent boundary layer. The scheme incorporates an algebraic stress closure for the turbulent stresses and heat fluxes based on the model of references [9–11]. A feature of the numerical treatment is the use of different finite-difference grids for the velocity and scalar fields each of which may expand independently in the down-wind direction so as just to cover the regions where significant gradients exist in the relevant dependent variables. Computations are reported for the diffusion of line and point sources with both ground and elevated releases. Calculations are generally in encouraging agreement with the measured behaviour.
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