Large Eddy Simulation of Accidental Releases

Leitl, Bernd; Hertwig, Denise; Harms, Frank; Schatzmann, Michael; Patnaik, Gopal; Boris, J. P.; Obenschain, Keith; Fischer, Susanne; Rechenbach, Peer

doi:10.1007/978-3-319-01860-7_22

Cited by 2 publications

(1 citation statement)

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“…Giometto et al, 2016) for urban air quality or emergency response dispersion applications (e.g. Patnaik et al, 2012;Leitl et al, 2014Leitl et al, , 2016. The time-dependency of the simulation also offers potential to expand deterministic analyses by probabilistic information, e.g.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation study on the structure of turbulent flow in a complex city

Tolias

Koutsourakis

Hertwig

et al. 2018

Journal of Wind Engineering and Industrial Aerodynamics

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Large Eddy Simulation (LES) of atmospheric flows has become an increasingly popular modelling approach within the last years, as it has the potential to provide deeper insight into unsteady flow phenomena. LES can be improved and validated using specifically designed and well documented wind tunnel datasets. In this work, we evaluate the performance of LES against a wind tunnel experiment in a semi-idealized city ("Michel-Stadt"; CEDVAL-LES database) and use the LES results to study the structure of the turbulent flow at the particular urban area. The first, second and third order statistics are presented, as well as velocity frequency distributions and energy spectra. The results compare well with the experimental values. Information about special features of the flow field is also provided. A particular focus of this work is put on the influence of grid resolution on the results. Five different grids are examined and the required resolution for turbulent flow within the canopy layer is evaluated. This study reveals the strong potential of LES for urban flow simulations. It is shown that LES can assess highly non-Gaussian flow behaviour in street canyons, which has implications for urban ventilation, wind comfort assessment and urban design.

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Section: Introductionmentioning

confidence: 99%