2016/09/12 by Viktor Ší́p, Šíp, Viktor, Luděk Beneš +1
Earth and Planetary Sciences · Environmental Science · Engineering · #Aeolian processes and effects #Wind and Air Flow Studies #Particle Dynamics in Fluid Flows
paper · pdf · doi:10.48550/arxiv.1609.03427
We present a description and validation of a finite volume solver aimed at\nsolving the problems of microscale urban flows where vegetation is present. The\nsolver is based on the five equation system of Reynolds-averaged Navier-Stokes\nequations for atmospheric boundary layer flows, which are complemented by the\nk-epsilon turbulence model. The vegetation is modelled as a porous zone, and\nthe effects of the vegetation are included in the momentum and turbulence\nequations. A detailed dry deposition model is incorporated in the pollutant\ntransport equation, allowing the investigation of the filtering properties of\nurban vegetation. The solver is validated on four test cases to assess the\ncomponents of the model: the flow and pollutant dispersion around the 2D hill,\nthe temporal evolution of the rising thermal bubble, the flow through and\naround the forest canopy, and a hedgerow filtering the particle-laden flow.\nGenerally good agreement with the measured values or previously computed\nnumerical solution is observed, although some deficiencies of the model are\nidentified. These are related to the chosen turbulence model and to the\nuncertainties of the vegetation properties.\n