Large eddy simulation of the flow around a low-rise building immersed in a rough-wall turbulent boundary layer

Nozawa, Kojiro; Tamura, Tetsuro

doi:10.1016/s0167-6105(02)00228-3

Cited by 140 publications

(66 citation statements)

References 10 publications

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“…The shape of the received profiles from the turbulent inflow case were in good agreement with other studies such as Kanda et al 6) who, used cyclic boundary conditions in their LES, and Nozawa and Tamura 10) , who used a turbulence recycling method instead of cyclic boundary conditions along the mean flow to simulate an urban boundary layer over a staggered grid of buildings. Also the advantages of the turbulence inflow method over a laminar inflow were shown.…”

Section: Discussionsupporting

confidence: 86%

Large-Eddy Simulation of an Urban Canopy Using a Synthetic Turbulence Inflow Generation Method

Gronemeier

Inagaki²,

Gryschka

et al. 2015

JJSCE B1

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When simulating the turbulent flow around urban structures with large-eddy simulation models it is often necessary to use non-cyclic boundary conditions in streamwise direction. In such cases a turbulent inflow condition at the inlet is favored although it is highly difficult to obtain. A synthetic turbulence generator, modelling turbulence statistics and correlations, is used to generate a turbulent inflow for large-eddy simulations. Results are compared with simulations using laminar inflow. An artificial urban canopy consisting of aligned buildings with cubical shape was used. Two simulations contained one additional tall building located at the center of the domain. The turbulence statistics show a well-developed urban boundary layer above the building arrays for each simulation. Higher turbulence intensity was found when using the turbulence inflow method resulting in faster development of an urban boundary layer.

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Section: Discussionsupporting

confidence: 86%

Large-Eddy Simulation of an Urban Canopy Using a Synthetic Turbulence Inflow Generation Method

Gronemeier

Inagaki²,

Gryschka

et al. 2015

JJSCE B1

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“…This is almost certainly a result of the limited spatial resolution. One would expect better agreement for finer grids -as indeed is suggested by Nozawa & Tamura's (2002) findings -although LES will always be limited to some extent, in this respect. It might be possible to parameterise the negative tail of the pdf (characterising the extreme values), based on experimental data like those here or using extreme value theory (e.g.…”

Section: Fluctuating Near-surface Conditionsmentioning

confidence: 55%

“…The second method has the desirable property that the generated inflow should naturally contain physically realistic coherent structures, without these having to be produced artificially; this is the method adopted in the present work. A similar method was used by Nozawa & Tamura (2002) in their computations of flow over a half-cube. However, they used sets of individual blocks in their precursor simulation to generate suitable rough-wall boundary layers but then, as noted earlier, used smooth walls in the half-cube computational domain; the influence of this effective sudden change in surface roughness at the start of the model domain is not clear.…”

Section: Inflow Boundary Layer Generationmentioning

confidence: 99%

“…Attempts have recently begun to compute these unsteady features. Nozawa & Tamura (2002), for example, have used LES to determine mean and fluctuating surface pressures on a half-cube model. Although they used a precursor simulation to generate appropriate rough-wall boundary layer inflow conditions, the ground surface in the computational domain used for the flow over the model was actually smooth.…”

Section: Introductionmentioning

confidence: 99%

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Flow around a cube in a turbulent boundary layer: LES and experiment

Lim

Thomas

Castro

2009

Journal of Wind Engineering and Industrial Aerodynamics

136

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We present a numerical simulation of flow around a surface mounted cube placed in a turbulent boundary layer which, although representing a typical wind environment, has been specifically tailored to match a series of wind tunnel observations. The simulations were carried out at a Reynolds number, based on the velocity U at the cube height h, of 20, 000 -large enough that many aspects of the flow are effectively Reynolds number independent. The turbulence intensity was about 18% at the cube height, and the integral length scale L u x was about 0.8 times the cube height h. The Jenson number Je = h/z0, based on the approach flow roughness length z0, was 600, to match the wind tunnel situation. The computational mesh was uniform with a spacing of h/32, aiding rapid convergence of the multigrid solver, and the governing equations were discretised using second order finite differences within a parallel multiblock environment. The results presented include detailed comparison between measurements and LES computations of both the inflow boundary layer and the flow field around the cube including mean and fluctuating surface pressures. It is concluded that provided properly formulated inflow and surface boundary conditions are used, LES is now a viable tool for use in wind engineering problems concerning flow over isolated bodies. In particular, both mean and fluctuating surface pressures can be obtained with a similar degree of uncertainty as usually associated with wind tunnel modelling.

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“…Nozawa ve Tamura [9] türbülanslı akış altında bir bina etrafında farklı durumlar için akış incelemiştir. Düzgün ve pürüzlü yüzeylerde farklı türbülans şiddetlerinin (%8, %14, %26) basınç katsayılarının dağılımına etkisi incelenmiştir.…”

Section: öNceki̇ çAlişmalarunclassified

Tek ve İki Bina Etrafındaki Rüzgar Etkilerinin Sayısal Olarak İncelenmesi

Fertelli

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzBu çalışmada, tek ve iki bina modeli için rüzgar yükünün etkileri sayısal olarak incelenmiştir. Bina modelleri etrafındaki akış alanları üç boyutlu ve zamandan bağımsız olarak FLUENT paket programı ile hesaplanmıştır. Sayısal çözümlemede Sivas ili için atmosferik sınır tabaka hız profili oluşturulmuş ve RNG k-ɛ türbülans modeli kullanılmıştır. Analizler sonucunda akım çizgileri, hız vektörleri, ortalama hız ve türbülans kinetik enerji dağılımları ile model yüzeylerinde ortalama basınç katsayısı dağılımları hesaplanmıştır. İki bina düzenlemesi için negatif basınç katsayılarının tekli binadan daha yüksek olduğu görülmüştür.Anahtar Kelimeler: Bina aerodinamiği, Basınç katsayısı, Rüzgâr yükü, Türbülans modeli Numerical Analysis of Wind Effect Around Single and Two Buildings AbstractIn this study, effects of wind load for the a single and two building arrangement is investigated numerically. Flow fields around building models are calculated by FLUENT software package in three dimension and independent of time. In numerical analysis the atmospheric boundary layer velocity profile was created for Sivas province and RNG k-ɛ turbulence model was used. As a result of analysis, streamlines, velocity vectors, mean velocity and turbulence kinetic energy distribution and mean pressure coefficient the patterns of models were calculated. It is seen that the negative pressure coeefficients for the two-building arrangement is larger than that for the single building.

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Large eddy simulation of the flow around a low-rise building immersed in a rough-wall turbulent boundary layer

Cited by 140 publications

References 10 publications

Large-Eddy Simulation of an Urban Canopy Using a Synthetic Turbulence Inflow Generation Method

Large-Eddy Simulation of an Urban Canopy Using a Synthetic Turbulence Inflow Generation Method

Flow around a cube in a turbulent boundary layer: LES and experiment

Tek ve İki Bina Etrafındaki Rüzgar Etkilerinin Sayısal Olarak İncelenmesi

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