Preprints
https://doi.org/10.5194/gmd-2021-255
https://doi.org/10.5194/gmd-2021-255

Submitted as: development and technical paper 25 Oct 2021

Submitted as: development and technical paper | 25 Oct 2021

Review status: this preprint is currently under review for the journal GMD.

uDALES 1.0.0: a large-eddy-simulation model for urban environments

Ivo Suter1,2, Tom Grylls1, Birgit Sützl1, and Maarten van Reeuwijk1 Ivo Suter et al.
  • 1Imperial College London, London, UK
  • 2Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland

Abstract. Urban environments increasingly move to the fore of climate and air quality research due to their central role in the population’s health and well-being. Tools to model the local environmental conditions, urban morphology and interaction with the atmospheric boundary layer play an important role for sustainable urban planning and policy-making. uDALES is a high-resolution, building-resolving large-eddy simulation code for urban microclimate and air quality. uDALES solves a surface energy balance for each urban facet and models multi-refection shortwave radiation, longwave radiation, heat storage and conductance, as well as turbulent latent and sensible heat fluxes. Vegetated surfaces and their effect on outdoor temperatures and energy demand can be studied. Furthermore a scheme to simulate emissions and transport of aerosols and some reactive gas species is present. The energy balance has been tested against idealized cases and the particle dispersion against field measurements, yielding satisfying results. uDALES can be used to study the effect of specific new constructions and building measures on the local micro-climate; or to gain new insight about the general effect of urban morphology on local climate, ventilation and dispersion. uDALES is available online under GNU General Public License and remains under maintenance and development.

Ivo Suter et al.

Status: open (until 30 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2021-255', Anonymous Referee #1, 24 Nov 2021 reply

Ivo Suter et al.

Model code and software

uDALES: large-eddy-simulation software for urban flow, dispersion, and microclimate modelling Grylls, T.; Suter, I.; Sützl, B.; Owens, S.; Meyer, D.; van Reeuwijk, M. https://zenodo.org/record/5111497

Ivo Suter et al.

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Short summary
Cities increasingly move to the fore of climate and air quality research due to their central role in the population’s health and well-being, while suitable models remain scarce. This article describes the development of a new urban model, which allows to examine the effects of various processes, infrastructure and vegetation on the local climate and air-quality. Possible applications are demonstrated and a comparison to a field experiment is shown.