000004244 001__ 4244
000004244 005__ 20141118185752.0
000004244 04107 $$acze
000004244 046__ $$k2005-05-31
000004244 100__ $$aCao, Shuyang
000004244 24500 $$aLES analysis of the turbulent boundary layer flow over 2 dimensional hills

000004244 24630 $$n10.$$pProceedings of the Tenth Americas Conference on Wind Engineering
000004244 260__ $$bAmerican Association for Wind Engineering, 2005
000004244 506__ $$arestricted
000004244 520__ $$2eng$$aThis paper presents Large Eddy Simulation (LES) results of the turbulent boundary layer flow over two dimensional hills. Two kinds of hill shapes, a steep one with separation and a low one without stable separation, and two kinds of surface condition, rough and smooth, are considered. The numerical results are validated by comparison with experimental data obtained at the same Reynolds number. Dynamic procedure proposed by Germano et al is applied to determine the eddy viscosity for the subgrid-scale stress model. The rough surface condition is modeled by placing rectangular cylinders on the hill surface, rather than setting the roughness length. Turbulent boundary layers that develop spatially over smooth flat wall and roughness blocks are simulated individually in order to generate the inflow turbulence. General agreements between the calculated and experimental data are obtained, however the deviation at the steep hill case is noticeable. The reason for the deviation is that the simulated inflow turbulence diverges from the experimental data somewhat. Finally, based on the numerical results, the hill shape effect and roughness effect are discussed. 

000004244 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004244 653__ $$aHill, Large Eddy Simulation, Inflow, Separation, Turbulence statistics

000004244 7112_ $$aTenth Americas Conference on Wind Engineering$$cBaton Rouge, Louisiana (US)$$d2005-05-31 / 2005-06-04$$g10ACWE
000004244 720__ $$aCao, Shuyang$$iTamura, Tetsuro
000004244 8560_ $$ffischerc@itam.cas.cz
000004244 8564_ $$s247171$$uhttps://invenio.itam.cas.cz/record/4244/files/074-Cao.pdf$$yOriginal version of the author's contribution as presented on CD, , paper No. 074.
000004244 962__ $$r4178
000004244 980__ $$aPAPER