Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

Xiong, Minghui; Chen, Bing; Zhang, Hua; Qian, Yao

doi:10.3390/app12147105

Cited by 6 publications

(5 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, tetrahedral cells have limitations in excessive stretching, leading to increased element counts compared to structured grids. Polyhedral cells offer a solution by reducing cell count, improving grid quality, and enhancing calculation accuracy. − Hosseini et al extensively studied the effect of cell type on total mesh cell counts, mesh quality, simulation time, accuracy of prediction, and residuals. They found that the cell type plays a crucial role in prediction accuracy for coarse meshes, whereas the cell type effect can be ignored for fine meshes.…”

Section: Cfd Modelmentioning

confidence: 99%

Analyzing Burner Performance and Combustion Phenomenon in an Olefin Plant’s Industrial Furnace: A CFD Study

Fattahi,

Ebrahimi,

Rahimi

et al. 2024

ACS Omega

View full text Add to dashboard Cite

This work presents a comprehensive study of the combustion performance of an industrial furnace in an olefin plant using computational fluid dynamics (CFD) simulations. The focus was on analyzing the heat release pattern of bottom burners to optimize the furnace efficiency in steam-cracking processes. The study developed an accurate computational fluid dynamics (CFD) model for predicting combustion behavior in a cracking furnace. The computational model was validated by comparing the simulation results with industrial data and was used to investigate the impact of burner clogging and the importance of small holes in the body of burners in the furnace. The results also provided insights into the influence of excess air, temperature distribution, fluid behavior, composition of combustion products, and thermal efficiency of the furnace. The presented results contributed to a better understanding of parameters controlling combustion performance in steam-cracking furnaces.

show abstract

Section: Cfd Modelmentioning

confidence: 99%

Analyzing Burner Performance and Combustion Phenomenon in an Olefin Plant’s Industrial Furnace: A CFD Study

Fattahi,

Ebrahimi,

Rahimi

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Therefore, the turbulent condition is applied under the realizable k-ε turbulence model for the present study. This model is selected as it provides more accuracy and less computational time [31,32]. The governing equations of the heat transfer and turbulent flow for the fluid can be seen in the following equations [31,32].…”

Section: Spray and Turbulent Modelsmentioning

confidence: 99%

“…This model is selected as it provides more accuracy and less computational time [31,32]. The governing equations of the heat transfer and turbulent flow for the fluid can be seen in the following equations [31,32]. Continuity:…”

Section: Spray and Turbulent Modelsmentioning

confidence: 99%

Computational Fluid Dynamics Analysis of Spray Cooling in Australia

Larpruenrudee,

Do,

Bennett

et al. 2023

Energies

View full text Add to dashboard Cite

Spray cooling technology offers high levels of uniform heat removal with very low fluid volumes and has found recent application in relatively small-scale use cases. Since it is a complex process, research can enable spray cooling to be applied more widely and at larger scales, such as in HVAC, as a means to operate more efficiently. Weather conditions are one of the main parameters that directly affect the effectiveness of spray cooling. This study investigates the spray cooling performance for temperature and humidity conditions in six Australian cities. ANSYS Fluent (2021 R1) software is applied for the numerical simulation. The numerical model is first validated with the available literature before a numerical simulation is conducted to assess each city throughout the year. These include Adelaide, Brisbane, Darwin, Melbourne, Perth, and Sydney. The spray cooling pattern, temperature, and humidity distribution, as well as the evaporation effect on different regions in Australia, is simulated and analysed based on the CFD technique. The results from this study indicate that weather conditions influence spray cooling for all cities, especially in summer. Along the wind tunnel, the temperature significantly drops at the spray cooling area, while the humidity increases. Due to the effect of spray cooling inside the wind tunnel, the temperature at the outlet is still lower than the inlet for all cases. However, the humidity at the outlet is higher than the inlet for all cases.

show abstract

“…The convergence residuals for velocity, momentum, and turbulence kinetic energy should be set to be below 10−4. However, if the convergence of the continuity equation is poor, the criterion can be relaxed to 10−3 [43,45]. Based on Soligo's findings on comfort wind speed and frequency under different conditions [46], as well as the research by Murakami et al, which introduced the outdoor comfort wind range under different temperature ranges [47], it has been determined that the comfortable wind speed for the Lingnan region in summer is 0.7-5.0 m/s.…”

Section: Mapping Of Ventilation Conditionsmentioning

confidence: 99%

Investigation and Evaluation of Insolation and Ventilation Conditions of Streetscapes of Traditional Settlements in Subtropical China

Lei

Zhou

et al. 2023

Buildings

View full text Add to dashboard Cite

Global warming, the urban heat island effect (UHI), and the risks of fossil fuel depletion necessitate a re-evaluation of traditional settlements that have been adapted to local climatic conditions, topography, and available resources, including materials and construction methods, through passive strategies to achieve thermal comfort. Although vernacular settlements have received considerable attention, few have examined and evaluated their streetscapes. This study investigates the impact of topographical features and architectural forms on insolation and ventilation conditions in traditional settlements in China’s southern subtropical climate. The aim is to explore traditional planning configurations of streetscapes at different altitudes to identify architectural forms and planning strategies that effectively improve outdoor users’ thermal comfort conditions. For this purpose, case studies are conducted on three traditional settlements in Lingnan; the Lingnan region has a typical subtropical climate in southern China. The chosen cases represent the main features of different topographical conditions, architectural forms, and climate zones in the Lingnan. We systematically simulated the insolation and ventilation in these settlements’ streetscapes on a monthly and quarterly basis and analyzed their sunlight hours, incident solar radiation, shading percentages, sky view factors (SVF), and wind speed. The findings show the following: (1) Specific terrains can affect streetscapes’ shading percentages and wind speed. The mountain settlement (With an average elevation of 600 m) is located on a southeast-facing slope (10° < slope < 20°). It receives an additional 10% of incident solar radiation compared to gentle terrain. (2) Compared to settlements located in coastal hills and mountainous, plain settlements have better shading and ventilation conditions in streetscapes. In terms of insolation, plain settlements have denser building configurations and narrower, elongated street corridors with a height-to-width ratio (H/W) = 1.9~5.5 (the height–width ratio value as street’s H/W (H = height, W = width); note that it is unitless), which can generate greater lower SVF (44.5%), and shading percentages (63.6%). Regarding ventilation, it is easier to create a “cool lane” (i) when the main street, oriented towards the dominant wind direction in summer, forms an angle <30° with it, (ii) when the primary street follows a NE–SW longitudinal orientation, while SE–NW horizontal streets intersect and weave through it, and (iii) with a H/W = 3~4 resulting in wind speeds of 2.9~4.0 m/s. (3) All the streetscapes have overshadowing occurring in winter; similarly, varying sizes of calm wind zones are created in summer. To alleviate these issues, widening the streetscapes along the buildings can permit solar penetration and natural ventilation. (4) In summer, installing shading devices along the horizontal plane of covered street corridors with a H/W = 1~4 and N–S longitudinal orientation can provide an additional shading of 3.6–22%.

show abstract

Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

Cited by 6 publications

References 51 publications

Analyzing Burner Performance and Combustion Phenomenon in an Olefin Plant’s Industrial Furnace: A CFD Study

Analyzing Burner Performance and Combustion Phenomenon in an Olefin Plant’s Industrial Furnace: A CFD Study

Computational Fluid Dynamics Analysis of Spray Cooling in Australia

Investigation and Evaluation of Insolation and Ventilation Conditions of Streetscapes of Traditional Settlements in Subtropical China

Contact Info

Product

Resources

About