Validation of large eddy simulation with wind tunnel experiment for urban canopy ventilation

0429213 - ÚT 2015 DE eng A - Abstract
Kukačka, Libor - Fuka, V. - Nosek, Štěpán - Jaňour, Zbyněk
Validation of large eddy simulation with wind tunnel experiment for urban canopy ventilation.
6th International Symposium on Computation Wind Engineering. Hamburg: Meteorological Institute, CEN, University of Hamburg, 2014 - (Schlunzen, K.). s. 150-151
[International symposium on computation wind engineering /6./. 08.06.2014-12.06.2014, Hamburg]
R&D Projects: GA ČR GAP101/12/1554
Institutional support: RVO:61388998
Keywords : urban canopy ventilation * urban-area geometry * wind tunnel * large eddy simulation * numerical model validation
Subject RIV: DG - Athmosphere Sciences, Meteorology

Ventilation in an idealised urban area with a complex geometry was investigated by a large eddy simulation LES and a wind tunnel experiment. In the wind tunnel, we assembled an experimental set-up for simultaneous measurement of velocity and concentration. The Charles University Large eddy Microscale Model (CLMM) solving the incompressible Navier-Stokes equations was used for numerical computing of the problem. We focused on the street canyon situated perpendicular to the approach flow and equipped by a line source of tracer gas. Vertical advective and turbulent pollution fluxes were computed as ventilation characteristics in three horizontal grids in different heights within the street canyon. A validation of LES numerical model was evaluated using the Hit Rate and the Factor of two observations FAC2 metrics. The model was successfully validated only for concentration and for a part of longitudinal velocity data. The possible problems in LES modelling are discussed.
Permanent Link: http://hdl.handle.net/11104/0239579