000022654 001__ 22654
000022654 005__ 20170724144659.0
000022654 04107 $$aeng
000022654 046__ $$k2017-07-04
000022654 100__ $$aVasaturo, Raffaele
000022654 24500 $$aLarge eddy simulation of a cross-ventilated building: validation and impact of inflow generators

000022654 24630 $$n7.$$p7th European and African Conference on Wind Engineering 
000022654 260__ $$bl'Association pour l'Ingénierie du Vent
000022654 506__ $$arestricted
000022654 520__ $$2eng$$aIn the present paper the cross-ventilation of an isolated building immersed in a neutral atmospheric boundary layer (ABL) with openings on the windward and leeward facades is investigated by means of numerical simulations at wind tunnel scale. Specifically, the large eddy simulation (LES) approach is employed, with a wall shear stress model at the bottom of the computational domain in order to take into account ground roughness. Three different inflow methods, i.e. a precursor method, the vortex method and the spectral synthesizer, are employed to generate the turbulent velocity profiles at the inlet of the computational domain. The numerical simulations are validated through wind tunnel test data available in literature and a statistical analysis is performed using common validation metrics. Results show that the choice of the inflow generator has a qualitative and quantitative influence on the predicted flow field and time-averaged concentration. Specifically, the precursor method and the vortex method provide similar results in terms of mean streamwise velocity, whereas the spectral synthesizer differs from the other two inflow generators in terms of predicted flow features (most notably a higher inclination of the ventilation jet). Slightly larger differences are observed for turbulence kinetic energy and time-averaged concentration, which are most accurately predicted by the precursor method. Nevertheless, despite the higher computational cost (+33%) of the precursor method, the performance difference with especially the vortex method is limited. In addition, both precursor method and vortex method outperform the spectral synthesizer for both turbulence kinetic energy and time-averaged concentration in most metrics. In conclusion, the vortex method can be considered the most costeffective among the inflow generators employed for the case examined.

000022654 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022654 653__ $$a

000022654 7112_ $$a7th European and African Conference on Wind Engineering$$cLiège, BE$$d2017-07-04 / 2017-07-07$$gEACWE2017
000022654 720__ $$aVasaturo, Raffaele$$iWesemael, Pieter van$$iBlocken, Bert$$iKalkman, Ivo
000022654 8560_ $$ffischerc@itam.cas.cz
000022654 8564_ $$s1158623$$uhttps://invenio.itam.cas.cz/record/22654/files/227.pdf$$yOriginal version of the author's contribution in proceedings, id 227, section .
000022654 962__ $$r22493
000022654 980__ $$aPAPER