Urban applications

   OSPM  


The laboratory has also been involved in the modelling of the traffic pollution in the historical center of the city of Thessaloniki. OSPM has been employed to estimate NOx and PM10 concentrations in the area.



Assael M.J., Delaki X., and Kakosimos K., “Local Scale Vehicles Pollution Study in the Absence of Sufficient Data: The Case of the City of Thessaloniki”, WIT Trans.: Ecol. and Environm.101:137-146 (2007)
Assael M.J., Delaki M., and Kakosimos K., “Applying the OSPM Model in the Calculation of PM10 Concentration Levels in the City of Thessaloniki”, Atmospheric Environment 42:65-77 (2008)

  Recirculation Zone 




The CFD results of wind flow and pollutant dispersion are studied to find a parameterisation for the Recirculation Zone. A series of methods are employed, including vortex visualization criteria, standard statistics and methods data analytics.

The aim is to establish a parameterisation for the Recirculation Zone that depends on the interpretation of flow properties and thus could be applicable to more complex geometries.



Chatzimichailidis A.E., Argyropoulos C.D., Assael M.J., and Kakosimos K.E., "A formulation for the street canyon recirculation zone based on parametric analysis of large eddy simulations", HARMO 2017—18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Bologna, Italy, 9–12 October 2017.

  CFD Simulations 




The Recirculation Zone is the component of street-scale Air Quality Models, that makes possible the calculation of different pollutant concentrations in a street canyon. The employed method in current models is empirical and this effort aims to connect Recirculation Zone with physical attributes of the flow.

Transient CFD simulations (Large Eddy Simulations) for the elementary quasi-2D street configuration were produced with the open-source software OpenFOAM and validated with water-channel data. Four street canyon aspect ratios were studied for several wind velocities and locations of source, to produce a data set which will be used for the study of pollutant dispersion.



Chatzimichailidis A.E., Argyropoulos C.D., Assael M.J., and Kakosimos K.E., "Qualitative and quantitative investigation of multiple Large Eddy Simulation aspects for pollutant dispersion in street canyons using OpenFOAM" (submitted).

   CFD Applications   




CFD packages are employed to simulate air distribution and consequently CO2 and NO2 polutants as well as PM10, generated by traffic and external soucres, in the historical centre of Thessaloniki (shown above).
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