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Published February 14, 2022 | Version 2.0
Software Open

CAIRDIO City-Scale Air Dispersion Model with Diffusive Obstacles

  • 1. Leibniz Institute for Tropospheric Research (TROPOS), Permoserstr. 15, 04318, Leipzig, Germany

Description

CAIRDIO is an atmospheric large-eddy simulation code for application on urban dispersion modeling. In CAIRDIO, buildings have an effect on the physical conservation laws of mass and momentum through modification of the permeability and capacity of grid cells. As such, CAIRDIO offers an enhanced flexibility in the choice of the grid resolution at the coarse end compared to standard obstalce-resolving codes. This includes marginally resolved building ensembles, i.e. with diffusive and overlapping building boundaries, for which urban dispersion can still be modeled with satisfactory detail but only for a fraction of the computation time needed to model fully-resolved obstacles. CAIRDIO uses terrain-fitted coordinates to describe a surface orography, and is therefore also suitable for the city-scale and beyond. 

CAIRDIO is written in Python and makes extensive use of the Python packages NumPy and SciPy for performance-critical model components. To improve the applicability on extensive domains and using modern hardware, CAIRDIO is parallelized using MPI.

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