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A dry deposition model suitable for use in the moment method has beendeveloped. Contributions from five main processes driving the deposition -Brownian diffusion, interception, impaction, turbulent impaction, andsedimentation - are included in the model. The deposition model was employed inthe moment method solver implemented in the OpenFOAM framework. Applicabilityof the developed expression and the moment method solver was tested on twoexample problems of particle dispersion in the presence of a vegetation onsmall scales: a flow through a tree patch in 2D and a flow through a hedgerowin 3D. Comparison with the sectional method showed that the moment method usingthe developed deposition model is able to reproduce the shape of the particlesize distribution well. The relative difference in terms of the third moment ofthe distribution was below 10\% in both tested cases, and decreased away fromthe vegetation. Main source of this difference is a known overprediction of theimpaction efficiency. When tested on the 3D test case, the moment methodachieved approximately eightfold acceleration compared to the sectional methodusing 41 bins.

Dry deposition model for a microscale aerosol dispersion solver based on the moment method