NUMERICAL STUDY OF THE TURBULENT-FLOW OVER AND IN A MODEL FOREST ON A2D HILL

Numerical predictions are presented for flow through and in a model fo rest on a two-dimensional hill. Calculations are performed with a fini te volume numerical algorithm, using non-staggered non-orthogonal grid systems. To eliminate false diffusion errors, the convective terms in the governing equations are discretized using a highly accurate numer ical scheme constructed from the class of total variation diminishing (TVD) schemes. The time averaged Navier-Stokes equations are closed by an extended k-epsilon eddy viscosity model including terms due to the drag caused by the canopy. The predictions are compared with reported LDV measurements obtained in an atmospheric boundary layer wind tunne l for different forested hill geometrical configurations. The calculat ions show good agreement with measurements concerning the strong influ ence of the tree cover on the separated flow region.