This 6 months research internship is a part of a large project “HÉLIOS” entitled “De la caractérisation spatiale, sanitaire et sociale des pHÉnomènes d’îLots de chaleur urbaIns à l’exploration et l’évaluation de solutiOns d’adaptation fondéeS sur la nature” by 5 local region communities (Le Havre, Métropole Rouen Normandie, Mantes-la-Jolie, Communauté d’Agglomération de Cergy-Pontoise, Argenteuil) in collaboration with CORIA Lab, other labs and the T.URN institute (https://www.univ-rouen.fr/actualites/decouvrez-linstitut-t-urn/). This internship is also in a global context of developing a multi-risk platform in Normandy region in France (e.g. for floods, fires and particles dispersion, air pollution dispersion, among others). One of the missions is to predict accurately the pollutants and particles dispersion at the scale of a city (smart city).
The main objective is to develop, implement and validate a new mesoscale model in CFD to take into account the air pollutants dispersion in outdoor microclimate and their local interaction with vegetation and green spaces. The latter usually modifies the mean flow motion into wake turbulence where the smaller length scales compared to the turbulence generated by the shear flow induces a fast dissipation. This will allow to investigate how local trees in the métropole region can contribute to the local interaction with air pollutants and particles dispersion outdoors under different wind speeds, air conditions, solar radiation and stomatal resistance. The major 3 work packages in this internship are the following:
1- Short literature review
2- Take into hands the CFD code OpenFOAM® and implement a new turbulence-modified model
3- Define and solve a bench 3D CFD case to validate the implemented turbulence model in Euler-Lagrange framework
4- Define and solve a 3D CFD case of the métropole that will investigate/predict the effects of different
scenarios of local wind speeds, air conditions, solar radiation and stomatal resistance on particles dispersion.
RÉSULTATS ATTENDUS POUR LA RÉDACTION DU RAPPORT DE STAGE
– Report summarizing the literature review and the new turbulence model implementation in OpenFOAM (60ème jour)
– Report on the 3D CFD case n°1 (100ème jour)
– Report on the 3D CFD case n°2 (180ème jour)
RÉFÉRENCES BIBLIOGRAPHIQUES DE L’ÉQUIPE D’ACCUEIL EN RAPPORT AVEC LE SUJET
Dbouk, T., Visez, N., Ali, S. et al. Risk assessment of pollen allergy in urban environments. Nature, Scientific Reports 12, 21076 (2022)
RÉFÉRENCES BIBLIOGRAPHIQUES REPLAÇANT LE SUJET DANS UN CONTEXTE PLUS LARGE
Amorim, J.H., Rodrigues, V., Tavares, R., Valente, J., Borrego, C., 2013. CFD modelling of the aerodynamic effect of trees on urban air pollution dispersion. Science of the Total Environment. 461, 541–551