Research context
This internship is in the context of a large project called POPSU: Platform for Observation of Urban Projects and Strategies and in the continuation of internal primary research works made by G. Maroun [1] and F. Catalan [2]. The T.URN Institute (https://www.univ-rouen.fr/actualites/decouvrez-linstitut-t-urn/) integrated recently this project which is financed by the Public Interest Group with Interministerial Vocation, Europe of Architectural and Urban Projects (the GIP EPAU). In partnership with the University of Paris-1, the Urban Planning Agency of Boucles de Seine et Eure, and the MRN (Métropole de Rouen Normandie), this POPSU project addresses multiple questions related to the socio-ecological transition in the objective of “characterizing the ecological issues at the Rouen Normandy Metropolis”.
This internship is also in a global context of developing a multi-risk platform (https://multirisques.univ-rouen.fr/) 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 local air flow dynamics at the scale of the city in presence of green areas (e.g. trees, forests).
Objectives
The main objective is to develop, implement and validate porosity models in CFD to take into account the true resistance of different urban trees to the local wind. This will enrich the physical models in the digital twin and will thus allow to investigate how local trees in the métropole region can affect outdoor air flow dynamics. This is essential for predicting the outdoor local dispersion of different sources of particles (e.g. from industrial and natural fires, airborne pollutants, etc) with an acceptable level of precision at a large scale (scale of the city of Rouen). The major 3 work packages in this internship are the following:
- Conduct Aerodynamics Measurements of air flow around trees in a wind tunnel to determine the porosity matrix of different types of representative trees at a laboratory scale.
- Conduct gaz components emissions from different type of wood/plant fire sources.
- Conduct 3D CFD simulations to validate the experimental measurements.
References
(1) Georges MAROUN, Modélisation et simulation numérique de la dispersion des polluants dans un milieu urbain, Rapport de Stage, CORIA, UROUEN, Août 2023.
(2) Fermı́n CATALÁN, Numerical modelling and simulation of the dispersion of pollutants in an urban environment, Internship Report, CORIA, UROUEN, Octobre 2023.
(3) T. DBOUK, N. VISEZ, S. ALI, I. SHAHROUR, D. DRIKAKIS, Risk assessment of pollen allergy in urban environments. Nature, Scientific Reports, 2022. DOI: https://doi.org/10.1038/s41598-022-24819-w
(4) Viana Parente Lopes JM, Palma JMLM, Silva Lopes A. Modelling the flow within forests: the canopy-related terms in the Reynolds-averaged formulation. Journal of Fluid Mechanics, 2021, 910:A7. Doi: https://doi.org/10.1017/jfm.2020.927
(5) C. Chatry, M. Le Quentrec, D. Laurens, J.-Y. Le Gallou, J.J. Lafitte B. Creuchet, J. Grelu, Rapport de la mission interministérielle. Changement climatique et extension des zones sensibles aux feux de forêts. Vie Publique, Rapport, 2010. https://www.vie-publique.fr/rapport/31347-changement-climatique-et-extension-des-zones-sensibles-aux-feux-de-foret
(6) Geon Kang, Jae-Jin Kim, Wonsik Choi, Computational fluid dynamics simulation of tree effects on pedestrian wind comfort in an urban area. Sustainable Cities and Society, Volume 56, May 2020, 102086. DOI: https://doi.org/10.1016/j.scs.2020.102086
(7) Se-Woon Hong, Lingying Zhao, Heping Zhu, CFD simulation of airflow inside tree canopies discharged from air-assisted sprayers. Computers and Electronics in Agriculture 149 (2018) 121–132. DOI: http://dx.doi.org/10.1016/j.compag.2017.07.011