LES of the flow and building wall pressures in the center of Tokyo

Nozu, Tsuyoshi; Tamura, Tetsuro; Okuda, Yasuo; Sanada, Satoshi

doi:10.1016/j.jweia.2008.02.028

Cited by 53 publications

(26 citation statements)

References 5 publications

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“…The present paper Thermal environment (RANS) 33 000 × 33 000 500 Baik et al (2009) Pollutant dispersion (RANS) 980 × 1140 400 Blocken and Persoon (2009) Wind environment (RANS) 3000 × 3000 900 Bou-Zeid et al (2009) Wind environment (LES) 1500 × 1500 400 Hanna et al (2009) Pollutant dispersion (RANS) Approximately 3200 × 900 Approximately 650 Xie and Castro (2009) Pollutant dispersion (LES) 1200 × 800 200 Nozu et al (2008) Wind load (LES) 2048 × 1024 800 Oguro et al (2008) Wind environment (RANS) 1 0000 × 1 0000 400 Tamura (2008) Wind load (LES) 2900 × 1200 1000 Burrows et al (2007) Wind environment (RANS) 2100 × 2100 300 Chan and Leach (2007) Pollutant dispersion (RANS) 1030 × 3010 425 Flaherty et al (2007) Pollutant dispersion (RANS) 900 × 1200 300 Hendricks et al (2007) Pollutant dispersion (RANS) 1400 × 1400 200 Huang et al (2005) Thermal environment (RANS) 400 × 400 450…”

Section: Introductionmentioning

confidence: 95%

Urban‐scale CFD analysis in support of a climate‐sensitive design for the Tokyo Bay area

Ashie

Kono

2010

Intl Journal of Climatology

117

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ABSTRACT:Recently, countermeasures against the urban heat island effect have become increasingly important in Tokyo. Such countermeasures include reduction of anthropogenic heat release and enhancement of urban ventilation. Evaluations of urban ventilation require construction of a high-resolution computational fluid dynamics (CFD) model, which takes into account complex urban morphology. The morphological complexity arises from multi-scale geometry consisting of buildings, forests, and rivers, which is superimposed on varying topography. Given this background, airflow and temperature fields over the 23 wards of Tokyo were simulated with a CFD technique using a total of approximately 5 billion computational grid cells with a horizontal grid spacing of 5 m. The root mean square (RMS) error of the air temperature between the simulation and observation results at 127 points was 1.1°C. Using the developed model, an urban redevelopment plan for two districts in metropolitan Tokyo was examined from the viewpoint of air temperature mitigation. Numerical results showed that a reduction by 1 ha in the area covered by buildings increases the area with temperatures below 30°C by 12 ha.

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Section: Introductionmentioning

confidence: 95%

Urban‐scale CFD analysis in support of a climate‐sensitive design for the Tokyo Bay area

Ashie

Kono

2010

Intl Journal of Climatology

117

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“…The hybrid tetrahedral and prismatic grids are filled in the inner region and the surface meshes of twin tall buildings are demonstrated in Figure 3(b), while the outer regions away from the central area are discretized by the structured elements to reduce the total grid number. And the total number of grids is 3.9×10 6 . The numerical simulation grid is shown in Figure 3.…”

Section: Case Study Of Wind Effects On Twin Tall Buildings In Urban Amentioning

confidence: 99%

“…With increasing computing power and advanced numerical techniques, some encouraging studies for LES of wind effects on buildings were reported [4][5][6] . Recently, Blocken et al conducted a verification and validation study to investigate the wind flow around a bluff body by LES.…”

Section: Introductionmentioning

confidence: 99%

CFD/FEM Based Analysis Framework for Wind Effects on Tall Buildings in Urban Areas

Qiao¹,

Li²,

Liu³

et al. 2017

dtetr

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In this paper, the one-way coupled numerical simulation with computational fluid dynamics (CFD) and finite element method (FEM) is used to evaluate the wind load and wind-induced vibration response of high-rise buildings in urban area. Firstly, this paper presents a complete framework for the numerical simulation of the wind effect of high-rise buildings, which mainly includes the module for the shape coefficient of structural members, the module for fluctuating wind load analysis of structural members and the module for the wind-induced vibration response analysis. Then, based on the proposed numerical simulation analysis framework, this paper selects one typical high-rise building located in the center of the high-density city to carry out the systematic analysis in terms of the shape coefficient, the wind pressure coefficient, the interference factor, the base moment spectrum and structural wind-induced vibration response, and combined with high-rise building structure specifications for its wind-induced vibration of a reasonable assessment. The results show that the proposed framework can effectively assess the wind effect of the high-rise building in the urban area and the accurate evaluation of the wind-induced vibration comfort, and provide a highly efficient and reliable tool for the wind resistance design of the high-rise building. 452

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“…Por fim, o modelo standard ké utilizado devido à relação entre qualidade dos resultados e pequena capacidade de processamento necessária, típica da abordagem RANS. O uso de abordagens alternativas ao RANS, tais como LES 2 ou DES 3 , traz benefícios reconhecidos ao cálculo de C p , porém ainda é restrito ao meio acadêmico devido às altas capacidades de processamento e armazenamento necessárias (NOZU et al, 2008).…”

Section: Modelagem Da Turbulênciaunclassified

Aplicação de CFD para o cálculo de coeficientes de pressão externos nas aberturas de um edifício

Cóstola

Alucci

2011

Ambient. constr.

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Resumooeficientes de pressão (C p ) são um importante parâmetro no estudo da ventilação pela ação dos ventos em edifícios. Este artigo tem por objetivo avaliar a viabilidade no uso de dinâmica dos fluidos computacional (CFD -Computational Fluid Dynamics) para a obtenção de C p , assim como avaliar a importância de alguns dos aspectos da configuração das simulações nos resultados obtidos. Os seguintes aspectos foram analisados: densidade da malha adotada, sensibilidade ao perfil de vento, e sensibilidade à rugosidade no piso do domínio. São ainda discutidos os valores de y + , assim como a relação entre valores de C p médio presentes na literatura e valores de C p local obtidos nas simulações. Adotou-se nas simulações um edifício isolado de 5 pavimentos, tipicamente utilizado em habitação de interesse social no Brasil. O artigo conclui que o uso de CFD para definição de C p é viável e constitui uma importante alternativa aos túneis de vento. Porém, diferentes configurações da simulação levam a desvios consideráveis, tanto em termos absolutos (até ± 0,5) quanto em termos relativos (até 50%). O teste de independência da malha se mostrou fundamental, assim como a definição do perfil de vento. Futuros trabalhos devem se concentrar na validação das simulações. Palavras

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LES of the flow and building wall pressures in the center of Tokyo

Cited by 53 publications

References 5 publications

Urban‐scale CFD analysis in support of a climate‐sensitive design for the Tokyo Bay area

Urban‐scale CFD analysis in support of a climate‐sensitive design for the Tokyo Bay area

CFD/FEM Based Analysis Framework for Wind Effects on Tall Buildings in Urban Areas

Aplicação de CFD para o cálculo de coeficientes de pressão externos nas aberturas de um edifício

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