Numerical modelling of arial pollutant emissions in and from livestock buildings

Various numerical models were used to predict the movement and distribution of gaseous pollutants within livestock buildings. Furthermore, emissions from a force ventilated fattening piggery and a naturally-ventilated broiler house were determined. There was reasonable agreement between predicted and measured flow fields and concentration fields when a two-dimensional model of a buildingÈs cross section was moved. A three-dimensional model gave some improvement for asymmetric ventilation systems, at the expense of more computing time. Concentrations of aerial pollutants in a naturally-ventilated broiler house showed a strong dependency on the wind direction. Atmospheric transport and turbulent dispersion of aerial pollutants from the fattening piggery ensured a rapid decrease of the concentration of pollutants with distance from the building.