title: Application of Detached Eddy Simulation to neighbourhood scale gases atmospheric dispersion modelling.
abstract: This paper addresses the current important problem of modelling the dispersion of toxic gases released in the urban terrains (i.e. neighbourhood scale) by the Detached Eddy Simulation (DES). This approach is a resolution that lays between the Reynolds Averaged Navier-Stokes and Large Eddy Simulation models and focuses especially on establishing a better balance between efficiency and accuracy. Herein are presented the theoretical approach of a new model, which is based on the DES and the Spalart-Almaras turbulent closure and a number of validation tests like the flow and the dispersion over and around a single building and an array of buildings. Overall, employed validation metrics were within the acceptable limits and the model demonstrated an acceptable agreement with the experimental datasets which confirms the use of this approach for the modelling and dispersion of gases in complex terrains like a city.
authors.affiliation: Mary Kay O'Connor Process Safety Center, Qatar & Department of Chemical Engineering, Texas A&M University at Qatar, Qatar. Electronic address: k.kakosimos@qatar.tamu.edu.
authors.forename: K E
authors.initials: KE
authors.lastname: Kakosimos
authors.forename: M J
authors.initials: MJ
authors.lastname: Assael
mesh_terms: D000392:Air Movements; D000393:Air Pollutants; D002947:Cities; D005740:Gases; D008962:Models, Theoretical
chemical_list: D000393:Air Pollutants; D005740:Gases
keywords: Detached eddy; Gas dispersion; Neighbourhood scale; Risk assessment; Spalart–Almaras; Urban scale