Figure 12
From: Risk assessment of pollen allergy in urban environments
Computational modelling of a birch tree for large-scale CFD problems. (a) Real tree; (b) approximating 3D CFD model with a volumetric porous media approach applied at the leaves envelop (Darcy–Forchheimer Porous Media Model). The steams are modelled as walls with no-slip velocity boundary conditions. The ground level corresponds to \(z=0\).
