CFD Simulations to Predict Comfort Level of Outdoor Wind Environment for Taipei Flora Exposition

2013 ◽  
Vol 421 ◽  
pp. 844-849
Author(s):  
An Shik Yang ◽  
Chao Jui Chang ◽  
Yu Hsuan Juan ◽  
Ying Ming Su
Keyword(s):  
Natural Ventilation ◽  
Open Space ◽  
Comfort Level ◽  
Cfd Analysis ◽  
Cfd Simulations ◽  
Wind Environment ◽  
Wind Comfort

The goal of this investigation is to conduct the CFD analysis in conjunction with the wind comfort level standard to predict the pedestrian wind comfort level around the Dreams, Angel Life and Future pavilions in the Xinsheng Park of the Taipei International Flora Exposition. The computerized airflow simulations were carried out to predict the detailed flowfield for determining the comfort level of outdoor wind environment for three pavilions in the Xinsheng Park. In order to generate the suitable environments of natural ventilation for visitors, the calculated results can be used to appraise the sufficiency of natural ventilation for the open space around the building cluster.

Influence of Summer Outdoor Pedestrian Wind Environment Comfort with Height-to-Width Ratios of Arcade in Taiwan

2016 ◽  
Vol 851 ◽  
pp. 633-638 ◽  
Author(s):  
Ying Ming Su ◽  
Hui Ting Chang
Keyword(s):  
Air Temperature ◽  
Field Measurement ◽  
Comfort Level ◽  
Width Ratio ◽  
Wind Environment ◽  
Global Trends ◽  
Measurement Result ◽  
Anal Ysis ◽  
The Difference ◽  
Wind Comfort

Arcade, a regional architecture style in Taiwan, is gradually replaced by sidewalk with the prevailing global trends of architecture design, thereby bringing greater challenges to pedestrians comfort. Past researches suggest optimal urban wind regime can mitigate heat island effect and enhance pedestrians comfort level. Therefore, the relationship between arcade and pedestrian wind comfort as well as the influence of arcade’s height-to-width ratios (H/W) on urban wind environment are worth a thorough research. This study takes Farglory Kyoto Community as the example. Arcades in three varied sizes are compared: In Case 1, height-to-width ratio (H/W) =1.25; Case 2(H/W=1.54); Case 3(H/W=0.75). In Aug 2016, field measurement was conducted comparable anal++ysis on outdoor environmental comfort. The field measurement result indicates that, wind environment is more stable for arcade than sidewalk, and that air temperature of arcade is 3.9 °C lower than sidewalk, thereby concluding arcade tends to generate more pedestrian wind comfort in summer. The measurement result of Thermo GEAR G100EXD suggests, during the hottest time at noon, the difference between air temperature on sidewalk and on arcade reaches 8 °C. This study also proves that in subtropical climates, arcade is more likely to provide pedestrians with higher comfort level, and that air temperature on arcade is 3.9°C lower than outdoors. The lower the height-to-width ratio is, the more comfortable the environment appears to be.

Investigation on Wind Environments of Surrounding Open Spaces Around a Public Building

2016 ◽  
Vol 33 (1) ◽  
pp. 101-113 ◽  
Author(s):  
A.-S. Yang ◽  
Y.-H. Juan ◽  
C.-Y. Wen ◽  
Y.-M. Su ◽  
Y.-C. Wu
Keyword(s):  
Comfort Level ◽  
Public Buildings ◽  
Open Spaces ◽  
Cfd Simulations ◽  
Simulation Tools ◽  
Museum Architecture ◽  
Urban Image ◽  
Guggenheim Museum ◽  
Wind Comfort

AbstractThe purpose of this study is to highlight the effectiveness and necessity of the computational methods applications for architecture conceptual designs and improve the use of advanced simulation tools in urban planning. The results can provide the urban designers, planners and other decision makers with useful design information for assessing human wind comfort of the surrounding open spaces of public buildings in an urban area. Among different kinds of public buildings, museum architecture is of significant social value and importance for the augmentation of urban image. Using the Guggenheim Museum Bilbao for the case study, this investigation performed CFD simulations of the airflow over the museum to characterize the wind environments around the buildings. The predicted wind speed distributions were used to determine the wind comfort level of the featured spots around the museum for evaluating the suitability allowing visitors to sit or stand at the pedestrian plane for extended periods.

CFD Simulations of Natural Ventilation Effect: A Case Study of New Administrative Building of the Guanyin Township

2013 ◽  
Vol 368-370 ◽  
pp. 611-614
Author(s):  
An Shik Yang ◽  
Jen Hao Wu ◽  
Yu Hsuan Juan ◽  
Ying Ming Su
Keyword(s):  
Fluid Dynamics ◽  
Decision Making ◽  
Computational Fluid Dynamics ◽  
Natural Ventilation ◽  
Cfd Simulations ◽  
Wind Environment ◽  
Computational Fluid Dynamics Cfd ◽  
Ventilation Effectiveness

The present study developed a computational fluid dynamics (CFD)-based performance simulator for assessing natural ventilation effectiveness to the central patio and corridors of the new administrative building of the Guanyin Township, Taiwan. The data can share with other potential users for achieving better understanding of the indoor microclimate and the interaction of buildings with urban wind environment for improvement of their design and functioning aspects during the decision-making procedure.

scholarly journals Impact of volume distribution on pedestrian wind environment in high-rise urban districts: a CFD study

2021 ◽  
Vol 2042 (1) ◽  
pp. 012064
Author(s):  
Milad Sadeghfar ◽  
Sadra Sahebzadeh
Keyword(s):  
Urban Design ◽  
Urban Areas ◽  
Volume Distribution ◽  
Cfd Simulations ◽  
Wind Environment ◽  
High Rise ◽  
Urban Districts ◽  
Computational Fluid Dynamics Cfd ◽  
Wind Comfort ◽  
The Impact

Abstract Pedestrian wind environment assessment is becoming an essential part of the urban design process especially in dense urban areas due to its ability to address the wind comfort/safety/health concerns in an early phase. In this paper, high-fidelity computational fluid dynamics (CFD) simulations, validated with experimental data, are performed on eight different designs in a generic urban layout to study the impact of volume distribution on pedestrian wind environment in high-rise urban districts. The results show that the blockage effects of the high-rise buildings decelerates the wind in the streets parallel to the flow while accelerating the flow in the streets perpendicular to the flow. This effect is evident up to a two block distance upstream of the high-rises. Furthermore, it is shown that consequent rows of high-rises in the downstream of the first row facing the wind flow have little effect on the upstream pedestrian wind; however, they have a significant role in the extent of affected areas downstream. The findings of this study provide further understanding about the impact of different volume distributions on pedestrian wind environment in high-rise urban districts and clarify their effect on wind safety and comfort.

Application of CFD Simulations in Studying Outdoor Wind Environment in Different Community Building Layouts and Open Space Designs

2013 ◽  
Vol 433-435 ◽  
pp. 2317-2324
Author(s):  
Kang Li Wu ◽  
I An Hung ◽  
Hsien Te Lin
Keyword(s):  
Open Space ◽  
Cfd Simulation ◽  
Community Building ◽  
Cfd Simulations ◽  
Wind Environment ◽  
Study Region ◽  
Field Surveys ◽  
Building Layout ◽  
The Common ◽  
Tainan City

This study explored the ventilation conditions of community atriums for selected housing prototypes in Tainan City, Taiwan. Employing field surveys and CFD simulations, the atrium ventilation of the selected housing building layouts were studied and compared. Through the CFD simulation using the common wind direction in the autumn of the study region, this study found that among the four community building layouts selected, the atrium space of the double-side opening townhouse building layout has the best outdoor ventilation. In addition, the study also revealed that when the arrangement of the building layout and the openings of the atrium are coordinated with the local wind environment, the outdoor ventilation will be significantly improved. Finally, this paper provides suggestions for building layouts and the design of community open space in order to enhances the ventilation of community atrium and its user comfort.

scholarly journals Using CFD to Evaluate Natural Ventilation through a 3D Parametric Modeling Approach

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2197
Author(s):  
Nayara Rodrigues Marques Sakiyama ◽  
Jurgen Frick ◽  
Timea Bejat ◽  
Harald Garrecht
Keyword(s):  
Natural Ventilation ◽  
Parametric Modeling ◽  
Cfd Simulations ◽  
3D Design ◽  
Post Process ◽  
Test House ◽  
Model Set ◽  
Computational Fluid Dynamics Cfd ◽  
Set Up ◽  
Passive Strategy

Predicting building air change rates is a challenge for designers seeking to deal with natural ventilation, a more and more popular passive strategy. Among the methods available for this task, computational fluid dynamics (CFD) appears the most compelling, in ascending use. However, CFD simulations require a range of settings and skills that inhibit its wide application. With the primary goal of providing a pragmatic CFD application to promote wind-driven ventilation assessments at the design phase, this paper presents a study that investigates natural ventilation integrating 3D parametric modeling and CFD. From pre- to post-processing, the workflow addresses all simulation steps: geometry and weather definition, including incident wind directions, a model set up, control, results’ edition, and visualization. Both indoor air velocities and air change rates (ACH) were calculated within the procedure, which used a test house and air measurements as a reference. The study explores alternatives in the 3D design platform’s frame to display and compute ACH and parametrically generate surfaces where air velocities are computed. The paper also discusses the effectiveness of the reference building’s natural ventilation by analyzing the CFD outputs. The proposed approach assists the practical use of CFD by designers, providing detailed information about the numerical model, as well as enabling the means to generate the cases, visualize, and post-process the results.

CFD-Analysis of Coverplate Receiver Flow

1996 ◽  
Author(s):  
Oliver Popp ◽  
Horst Zimmermann ◽  
J. Kutz
Keyword(s):  
Turbine Rotor ◽  
Geometrical Parameters ◽  
Receiver Design ◽  
Cfd Analysis ◽  
Efficiency Improvement ◽  
System Efficiency ◽  
Cfd Simulations ◽  
Air Supply ◽  
Cooling Air ◽  
Contour Design

The flow field in a preswirled cooling air supply to a turbine rotor has been investigated by means of CFD-simulations. Coefficients for system efficiency are derived. The influences of various geometrical parameters for different configurations have been correlated with the help of appropriate coefficients. For some of the most important geometrical parameters of the coverplate receiver design recommendations have been found. For the preswirl nozzles the potential of efficiency improvement by contour design is highlighted.

scholarly journals CFD analysis of the fluid motion in the isolation rooms

2021 ◽  
Vol 850 (1) ◽  
pp. 012025
Author(s):  
P Tamil Selvan ◽  
K Abhiram ◽  
Ch Anu Raghava ◽  
V Naveen Sai
Keyword(s):  
World Health Organization ◽  
Atmospheric Pressure ◽  
Pressure Difference ◽  
Fluid Motion ◽  
Particle Diameter ◽  
World Health ◽  
Cfd Analysis ◽  
Cfd Simulations ◽  
The World ◽  
Health Organization

Abstract COVID-19 is declared as a pandemic by WHO (world health organization) which has led to many deaths all over the world. This study deals with the fluid motion in the isolation rooms with 12 or more ACH (air changes per hour) and maintaining a minimum pressure difference of 2.5 Pascal that can help in reducing the transmission of the virus from affected people. ANSI/ASHRAE guidelines are considered for the analysis. These Isolation rooms help in eradicating the spread of the contaminated particles to the surroundings by creating a pressure less than the atmospheric pressure in in the room. CFD simulations are carried to study the fluid motion of the particles emitted by the patient inside the room. The Analysis is carried out with various human cough velocities of different particle diameters and we observed from the results that the time taken by the particles to reach the exhaust increases with increase in particle diameter, and the flow inside the room increases with increase in human cough velocity.

scholarly journals OPEN SPACE DESIGN STUDY ON THE BASIS OF EXTREME MICROCLIMATE AND SPATIAL BEHAVIOR IN NORTHERN CHINA

2018 ◽  
pp. 180-192
Author(s):  
Zhiming Guo ◽  
Tsuyoshi Setoguchi ◽  
Norihiro Watanabe ◽  
Ke Huo
Keyword(s):  
Optimization Design ◽  
Open Space ◽  
Northern China ◽  
Comfort Level ◽  
Spatial Behavior ◽  
Air Velocity ◽  
Space Forms ◽  
Outdoor Activities ◽  
Outdoor Comfort ◽  
Spatial Behaviors

Microclimate in open space affected by the urban layout and spatial forms plays an important role in the outdoor comfort, thus the outdoor activities based on the comfort sensation will directly affected by the microclimate. An outstanding open space should satisfy different requirements of outdoor activities and create relatively comfortable sensation. Most studies have been conducted on these relationships only above 0 Celsius degree. However, only few have focused on extreme situations in both hot and cold seasons. Therefore, from microclimate perspective, taking people’s comfort and spatial behaviors as criterions, this research discussed how the open space forms affect microclimate, thus affect comfort sensation and spatial behaviors. The outcomes may provide some useful insights for planners and architects to understand the relationship among microclimate, open space and people. Results showed that microclimate obviously affected people’s comfort. In hot season, shade and air-flow played crucial roles in outdoor comfort. People tend to stay outside in the shade and the area with higher air velocity. After sunset is popular period for outdoor activities. In cold season, at the same ambient temperature, lower air velocity raised the comfort level. Shade also had influences on comfort sensation but do not affect spatial behaviors significantly. This paper also proposes optimization design proposals of densely populated open space based on extreme microclimate and spatial behaviour.

scholarly journals AUTOMATIC CARTESIAN GRID GENERATION FOR CFD ANALYSIS OF WIND ENVIRONMENT

2008 ◽  
Vol 73 (624) ◽  
pp. 207-214
Author(s):  
Masashi IMANO ◽  
Naoki OHNISHI ◽  
Motoyasu KAMATA ◽  
Yuzo SAKAMOTO
Keyword(s):  
Grid Generation ◽  
Cartesian Grid ◽  
Cfd Analysis ◽  
Wind Environment
Sign in / Sign up

Export Citation Format

Share Document