Impact of inflow methods and aerodynamic roughness lengths on the streamwise homogeneity of flow profiles in LES of the neutral ABL

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

In Computational Fluid Dynamics (CFD) simulations of the atmospheric boundary layer (ABL) the relation between inflow conditions and wall boundary conditions has been thoroughly investigated for Reynolds-averaged Navier-Stokes (RANS) modeling, whereas it yet needs to be evaluated for Large Eddy Simulations (LES). In the present paper streamwise homogeneity of flow profiles for LES of the neutral ABL over surfaces with different aerodynamic roughness lengths in combination with three different inflow turbulence generation methods is investigated. Specifically, one precursor and two synthetic methods have been considered along with three aerodynamic roughness lengths. The results show that the precursor method satisfactorily preserves the homogeneity of both mean velocity and turbulence kinetic energy, with respective average deviations up to 0.7% and 3.5% from target profiles at the outlet of the domain. Among the synthetic methods, less accurate but also less computationally demanding than the precursor method, the Vortex Method greatly outperforms the Spectral Synthesizer in terms of both mean velocity and turbulence kinetic energy. Lastly, terrain roughness is found to have only a weak influence on the performance of the inflow methods considered.
Originele taal-2Engels
TitelXIV Conference of the Italian Association for Wind Engineering (IN-VENTO 2016), 25-28 September 2016, Terni, Italy
Aantal pagina's10
StatusGepubliceerd - 2016
Evenement14th Conference of the Italian Association for Wind Engineering (IN-VENTO 2016) - Hotel Valentino, Terni, Italië
Duur: 25 sep 201628 sep 2016
Congresnummer: 14
http://www.in-vento-2016.org/
http://www.in-vento-2016.org/

Congres

Congres14th Conference of the Italian Association for Wind Engineering (IN-VENTO 2016)
Verkorte titelIN-VENTO 2016
LandItalië
StadTerni
Periode25/09/1628/09/16
Internet adres

Vingerafdruk Duik in de onderzoeksthema's van 'Impact of inflow methods and aerodynamic roughness lengths on the streamwise homogeneity of flow profiles in LES of the neutral ABL'. Samen vormen ze een unieke vingerafdruk.

  • Citeer dit

    Vasaturo, R., Kalkman, I. M., Blocken, B., & van Wesemael, P. J. V. (2016). Impact of inflow methods and aerodynamic roughness lengths on the streamwise homogeneity of flow profiles in LES of the neutral ABL. In XIV Conference of the Italian Association for Wind Engineering (IN-VENTO 2016), 25-28 September 2016, Terni, Italy