| مستخلص: |
Towards prediction of wind load on pylons for anatmospheric boundary layer flow over two successive hillsKarim ADIB1, Adrien THACKER1, Dominique ASTRUC1, FrédéricY. MOULIN11 Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS,Toulouse, Francekarim.adib@imft.fr In the neutral atmospheric boundary layer, the wind load on pylons (or towers) is highlyimpacted by local roughness distribution and topography. For relatively slender topographies,the linear theory developped by Hunt et al.[1988] is generally applied. For steeptopographies, no theory is available to predict the local flow conditions exerted on thepylons. Here, we investigate in particular the situation of two successive 2D hills. Theseparation flow behind the first hill and its effect on the second hill have been studiedexperimentally for particular configurations by Almeida et al. [1993], Athanassiadou andCastro[2001], Li et al. [2017] and were compared with numerical models by Carpenter andLocke [1999]. Here, we present a parametric investigation of 2 hills configurationsusing the SATURN numerical code (finite volume method). Firstly, we validated theperformance of Reynolds-averaged Navier-Stokes (RANS) turbulence models forsteep hills by comparison with experiments conducted in a flume in our laboratory.Secondly, we investigated numerically the influence of three parameters on local flowconditions around the second hill : λ, the distance between the hills, H, the height ofhills and L, the width of hill. By varying these parameters, we observed differentbehaviors for the mean flow topology and turbulence intensity along the second hill. [ABSTRACT FROM AUTHOR] |
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