Design for improving pedestrian wind comfort: a case study on a courtyard around a tall building

Serteser, N.; Karadağ, İlker

doi:10.1080/00038628.2018.1492899

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…The standard K-epsilon (k-ε) turbulence model with two-scale wall functions is used to provide closure. Two-scale wall functions are devised to fit a fluid's boundary layer profile relative to the main flow's properties (Serteser and Karadağ, 2018):When the fluid mass centers of the near-wall mesh cells are located inside the boundary layer, the physical fluid flow boundary layer is thick.When the fluid mass centers of the near-wall mesh cells are located outside the boundary layer, the physical fluid flow boundary layer is thin.…”

Section: Methodsmentioning

confidence: 99%

Numerical evaluation of pedestrian-level wind and indoor thermal comfort of a historical monument, Muğla, Turkey

Gençer

Karadağ

2022

OHI

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PurposeThe study aims to analyze both thermal and wind comfort conditions of a historical mosque's interior and outdoor spaces for the planning of further conservation decisions.Design/methodology/approachThe method is composed of two steps. First, thermal comfort analyses are conducted via Design-Builder Software. The predicted mean vote (PMV) and predicted percentage of dissatisfied indices were calculated and evaluated using the ASHRAE 55–2010 standard. Thermal comfort conditions are analyzed with the proposed three operations. Second, wind comfort analyses are conducted via computational fluid dynamics (CFD) software. Outdoor thermal comfort conditions are predicted by air temperature, mean radiant temperature, wind speed and relative humidity.FindingsThe (PMV) in the harim was calculated as −1.83 (cool) which corresponds to a predicted percentage of dissatisfaction (PPD) equal to 68.54%. Thermal comfort was provided by daytime and continuous operations; however, intermittent operations did not provide thermal comfort. The wind velocities around the mosque are well below the 5 m/s limit value for standing defined by NEN 8100 wind nuisance standard. Moreover, the limit value of 2.5 m/s for sitting was also satisfied with more than 80% of the semi-enclosed area around the entrance of the mosque. Last comer's hall remains in a slight cold stress range, the rest of the areas have no thermal stress.Originality/valueThis two-stage study creates a base for further improvements to provide comfort conditions in a historical building without interfering with its original features.

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Section: Methodsmentioning

confidence: 99%

Numerical evaluation of pedestrian-level wind and indoor thermal comfort of a historical monument, Muğla, Turkey

Gençer

Karadağ

2022

OHI

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“…A large computational model needs to be created, and different zones with respect to aerodynamic roughness lengths should be arranged. For instance, in the wind comfort study [6], the nearby area around the analyzed tall building is modeled explicitly (zone 2), and the far field containing an urban area with tall buildings is implicitly modeled (zone 3) using aerodynamic roughness length of y0 = 2 m (Figure 1a). While the whole domain area is 1400 m by 2600 m, the area with explicitly modeled buildings was 400 m by 400 m. An upstream domain extension of 5H and a downstream domain extension of 15H were left in the domain as advised in the guidelines [4].…”

Section: Methodology For the Assessment Of Wind Energy Potential In Amentioning

confidence: 99%

Wind Turbine Integration to Tall Buildings

Karadağ¹,

Yuksek²

2020

Renewable Energy - Resources, Challenges and Applications

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Having a far distance from the ground levels exposed to turbulent wind conditions, tall buildings have the potential of generating wind energy. However, there are many challenges to incorporating wind generation into urban areas. These include planning issues besides visual impacts. So, as to integration, there is a need for a combined approach that considers wind energy harvesting besides these issues. At this point, a multidisciplinary approach can fill the gap between the architectural design and the wind engineering processes. Based on this approach, this chapter presents design strategies from the literature to integrate wind energy to tall buildings using computational fluid dynamics (CFD) simulation. It is intended to guide further researches on wind energy and consequently to contribute to the environmental quality of urban areas and sustainable development of the cities.

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“…During the process of urban development and expansion, the building density, size and geometry are changing dramatically, especially in the megacities such as Guangdong-Hong Kong-Macao Greater Bay Area (GBA), China. Buildings can block the atmospheric flow, altering the wind direction and velocity, which in turns significantly affect the pedestrian level wind comfort in the building surroundings (Du and Mak 2017;Serteser and Karadag 2018;Li and Chen 2020). To satisfy the needs of urban residents in high-level living standards, more comfortable and safer wind environment are required in the high dense cities.…”

Section: Introductionmentioning

confidence: 99%

The recirculation flow after different cross-section shaped high-rise buildings with applications to ventilation assessment and drag parameterization

Chen,

Mo,

Hang

2024

Build. Simul.

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The building cross-section shape significantly affects the flow characteristics around buildings, especially the recirculation region behind the high-rise building. Eight generic building shapes including square, triangle, octagon, T-shaped, cross-shaped, #-shaped, H-shaped and L-shaped are examined to elucidate their effects on the flow patterns, recirculation length L and areas A using computational fluid dynamics (CFD) simulations with Reynolds-averaged Navier-Stokes (RANS) approach. The sizes and positions of the vortexes behind the buildings are found to be substantially affected by the building shapes and subsequently changing the recirculation flows. The recirculation length L is in the range of 1.6b -2.6b with an average of 2b. The maximum L is found for L-shaped building (2.6b) while the shortest behind octagon building (1.6b). The vertical recirculation area Av is in the range of 1.5b 2 -3.2b 2 and horizontal area Ah in 0.9b 2 -2.2b 2 . The L, Av and Ah generally increase with increasing approaching frontal area when the wind direction changes but subject to the dent structures of the #-shaped and cross-shaped buildings. The area-averaged wind velocity ratio (AVR), which is proposed to assess the ventilation performance, is in the range of 0.05 and 0.14, which is around a three-fold difference among the different building shapes. The drag coefficient parameterized by Ah varies significantly, suggesting that previous models without accounting for building shape effect could result in large uncertainty in the drag predictions. These findings provide important reference for improving pedestrian wind environment and shed some light on refining the urban canopy parameterization by considering the building shape effect.

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Design for improving pedestrian wind comfort: a case study on a courtyard around a tall building

Cited by 13 publications

References 21 publications

Numerical evaluation of pedestrian-level wind and indoor thermal comfort of a historical monument, Muğla, Turkey

Numerical evaluation of pedestrian-level wind and indoor thermal comfort of a historical monument, Muğla, Turkey

Wind Turbine Integration to Tall Buildings

The recirculation flow after different cross-section shaped high-rise buildings with applications to ventilation assessment and drag parameterization

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