A CFD Comsol model for simulating complex urban flow

Houda, Saddok; Belarbi, Rafik; Zemmouri, Noureddine

doi:10.1016/j.egypro.2017.11.224

Cited by 26 publications

(13 citation statements)

References 1 publication

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“…In previous studies, wind and thermal conditions were simulated using frontal area index (FAI) [1,12] and computational fluid dynamics (CFD) models [13,14]. However, only considering the FAI of a building is insufficient for considering the surface roughness length and then estimating the urban microclimate, including wind and thermal conditions.…”

Section: Introductionmentioning

confidence: 99%

Urban Roughness Estimation Based on Digital Building Models for Urban Wind and Thermal Condition Estimation—Application of the SkyHelios Model

et al. 2017

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Roughness length is a critical parameter for estimation of wind conditions, and it is therefore also relevant for the estimation of human thermal conditions in urban areas. The high density of buildings in urban areas causes large changes in land coverage, thereby increasing surface roughness. This influence atmospheric flow and also leads to a reduction in urban air ventilation, thus increasing the risk of human thermal stress. In this study, a digital building model of Tainan city was used to calculate roughness length using an approach based on Voronoi cells by applying the microclimate model, SkyHelios. The model was also used to estimate the wind conditions, including the wind speed and wind direction. For estimation of the thermal conditions, this study obtained meteorological data for air temperature, relative humidity, globe temperature, wind speed, and wind direction on two specific days (31 July 2015 and 21 January 2016). To quantify the thermal stress, the physiologically equivalent temperature (PET) was used to represent the thermal conditions. The wind conditions results obtained from the model indicate that even microscale conditions with vortices and corner flow can be represented with high precision and resolution. The thermal conditions results demonstrate that different created environments and microclimate conditions affect the thermal environment. The difference in PET can be up to 3 • C. This study confirmed that comparison of microclimate thermal conditions based on measurements and obtained from modeling using SkyHelios are in sufficient agreement and can be used in urban planning in the future.

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Section: Introductionmentioning

confidence: 99%

Urban Roughness Estimation Based on Digital Building Models for Urban Wind and Thermal Condition Estimation—Application of the SkyHelios Model

et al. 2017

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“…Table 1. The model constants, which are verified and used in the governing equations from experimental data [52,53,55,56].…”

Section: Rans Equation System (Setting Up the Standard K-ε Model)mentioning

confidence: 96%

“…Observations and measurements were recorded at the same time for all blocks within the area of 1 km. (d) The fourth step was a simulation method using CFD [50][51][52][53] analysis in which digital models of low-rise, mid-rise, and high-rise residential blocks were generated (using AutoCAD 2018-AUTODESK, California, USA) and a CFD domain [54] was set up after adding proper mesh [55] on models by ICEM-CFD 15. The study was performed to evaluate urban microclimates with the interactive impact of building diversity on the thermal balance that involves wind flow.…”

Section: Long-term and Mobile Observational Study Using Srst And Gis mentioning

confidence: 99%

The Interactive Impact of Building Diversity on the Thermal Balance and Micro-Climate Change under the Influence of Rapid Urbanization

Makvandi

Elsadek

et al. 2019

Sustainability

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Numerous cities face the serious problems of rapid urbanization and climate change, especially in recent years. Among all cities, Wuhan is one of the most affected by these changes, accompanied by the transformation of water surfaces into urban lands and the decline of natural ventilation. This study investigated the impact of surface urban heat island enlargement (SUHI) and block morphology changes in heat balance. Accordingly, the interactive impact of building diversity with major building forms (low-rise, mid-rise, and high-rise) on thermal balance and microclimate changes under the influence of urban land expansion at the residential block scale was studied. To investigate the heat balance changes by air temperature intensification and air movement reduction, a long-term and field observational analysis (1980–2018) coupled with computational fluid dynamic simulation (CFD) was used to evaluate the impact of building diversity on thermal balance. Outcomes show that urban heat island intensity (UHII) increased by 2 ℃ when water surfaces in urban areas decreased; consequently, there was a deterioration in the air movement to alleviate UHII. Thus, the air movement declined substantially with UHII and SUHI enlargement, which, through increased urban surfaces and roughness length, will become worse by 2020. Furthermore, the decline in air movement caused by the transformation of urban water bodies cannot contribute to the heat balance unless reinforced by the morphology of the urban blocks. In the design of inner-city blocks, morphological indicators have a significant impact on microclimate and heat balance, where increasing building density and plot ratio will increase UHII, and increasing water surfaces will result in an increase in urban ventilation. Lastly, a substantial correlation between air temperature and relative humidity was found, which, together with the block indicators, can help control the air temperature and adjust the urban microclimate.

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“…The calculation area was a rectangle within the target area ( Figure 10). The size of each area is set by using previous studies as a reference (Takebayashi, 2015, Hayashi et al, 2014& Houda, et al, 2017. Moreover, the target area was partitioned using the function in which suitable mesh size is calculated automatically.…”

Section: Numerical Simulation Based On Computational Fluid Dynamics (mentioning

confidence: 99%

Public Health and Well-being in Public Open Spaces through Climate Responsive Urban Planning and Design

2020

jps

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Established on a well-consolidated global network of scholars and professionals, The Journal of Public Space is committed to expand current scholarship by offering a global perspective and providing the opportunity for unheard countries to speak up and to discuss neglected as well as emerging topics that are usually sidelined in mainstream knowledge. The Journal of Public Space is addressing social sciences and humanities as a major field, and is interested also in attracting scholars from several disciplines. It will perform as a scholarly journal but also as an interdisciplinary platform of discussion and exchange by scholars, professionals, organizations, artists, activists and citizens, whose activities are related to public space.

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A CFD Comsol model for simulating complex urban flow

Cited by 26 publications

References 1 publication

Urban Roughness Estimation Based on Digital Building Models for Urban Wind and Thermal Condition Estimation—Application of the SkyHelios Model

Urban Roughness Estimation Based on Digital Building Models for Urban Wind and Thermal Condition Estimation—Application of the SkyHelios Model

The Interactive Impact of Building Diversity on the Thermal Balance and Micro-Climate Change under the Influence of Rapid Urbanization

Public Health and Well-being in Public Open Spaces through Climate Responsive Urban Planning and Design

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