Cfd simulation for wind comfort and safety

International Journal of Architecture, Engineering and Construction
Vol 2, No 2, June 2013, 131-143
CFD Simulation for Wind Comfort and Safety
in Urban Area: A Case Study of Coventry University
Central Campus
Mohamed Sakr Fadl1,∗
, John Karadelis2
1
Department of Civil Engineering, Architecture and Building, Coventry University,
Coventry CV1 5FB, United Kingdom
2
Mechanical Engineering Department, Mansoura University, Mansoura 35516, Egypt
Abstract: Concern towards the quality of public urban areas has increased in recent years. Wind comfort and
safety in pedestrian areas has become one important environmental parameter when designing new cities. Hence,
architects and town planners need guidelines and simplified design tools to take account of the wind in their
projects. The objectives of this study provide more insight in the pedestrian living conditions around the Hub, a
newly built structure, part of Coventry University campus and at the same time study the influence of building
shapes on the wind distribution. The latter is based on a series of computational fluid dynamics simulations
(CFD), used to advise the University’s Estates Department of the possibility of wind nuisance around the central
campus area. The velocity field was computed using the finite volume method. The simulations were performed
for different wind speeds and directions. The predicted results showed that the distribution of the velocity field
varied and had different characteristics with different wind directions. Also, it was established that the wind
speed amplification factors in diverging passages were generally larger than those in converging passages. The
case study incorporated is intended to support and guide future studies of wind comfort and safety with CFD
and thus makes a modest contribution in improving wind environmental quality in urban areas.
Keywords: Computational fluid dynamics, pedestrian wind comfort, built environment and modelling
DOI: 10.7492/IJAEC.2013.013
1 INTRODUCTION
Pedestrian-level wind (micro)-conditions is one of the
first microclimatic issues to be considered in modern
city planning and building design (Wu and Kriksic
2012). The construction of a new building alters the
microclimate in its vicinity; hence wind comfort and
safety for pedestrians become important requirements
in urban planning and design. Today, some city au-
thorities request studies of pedestrian wind comfort
and safety for new buildings and new urban develop-
ments.
High-rise buildings are particularly influential to
wind effects. Therefore, information about wind flow
patterns around buildings can be important to archi-
tects and urban planners. As a result of the public’s
growing awareness of the latest scientific and engineer-
ing achievements, contemporary architects, designers
and engineers should pay more attention in creating
more comfortable and functional buildings and their
surroundings.
In particular, near and around high-rise buildings,
high wind velocities are often introduced at pedes-
trian level that can be experienced as uncomfortable,
or sometimes even dangerous. Traditionally, wind flow
at pedestrian level can be simulated in boundary-layer
wind tunnels. However, with the advent of computa-
tional power and the introduction of numerical meth-
ods like the Finite Element Analysis, it is possible to
accurately simulate the same conditions in a virtual
environment using advanced modelling techniques like
the Computational Fluid Dynamics (CFD). The latter
can provide significant cost benefits for assessing and
optimising engineering design solutions related to en-
*Corresponding author. Email: ab4393@coventry.ac.uk
131

Fadl and Karadelis/International Journal of Architecture, Engineering and Construction 2 (2013) 131-143
vironmental concerns. CFD allows the investigator to
analyze the full domain of the model, provides a com-
plete picture of the problem and presents the results
in an easy-to-understand graphical way, as opposed to
relying on expensive and time consuming collection of
several dozens of discrete points, as it is usually the case
with physical wind tunnel modelling. CFD modelling
has been used by enviro-metrics to assess comfort levels
with respect to wind climate, based on evaluating the
wind flow fields around buildings, as well as the asso-
ciated outdoor thermal comfort, air ventilation, snow
accumulation, rain infiltration and other microclimatic
conditions (Stathopoulos and Baskaran 1996).
Over the last two decades, along with the perfection
of the CFD method, many researchers have concen-
trated on the numerical simulations of air flow past
a single building. Their studies revealed some compli-
cated flow phenomena, such as separation, vortex shed-
ding, recirculation and reattachment and predicted
some accurate numerical results (Paterson and Apelt
1986; Murakami 1998; Bosch and Rodi 1998).
Pedestrian-level winds can be described quite ade-
quately in terms of mean velocities in the presence and
absence of a new building within a specific urban en-
vironment. Although it can be argued that pedestri-
ans are mostly affected by gust effects and mean wind
speeds may not be sufficient to cause results for con-
cern, the fact remains that several major cities plan-
ners require only the fulfilment of certain mean (sus-
tainable) speeds with a specified probability of ex-
ceedance (Stathopoulos 2006). The process of compar-
ison between computational and experimental results
has already been challenged and appears problematic
on its own. For instance, is it more meaningful to carry
out point-by-point comparisons or does it make more
sense to examine pedestrian-level wind speeds affect-
ing a particular zone or area of influence for a specific
activity within the urban environment?
2 CLIMATE-RESPONSIVE DESIGN
STRATEGIES
Outdoor human comfort in an urban climate may be
affected by a wide range of parameters, including wind
speed, air temperature, relative humidity, solar radi-
ation, air quality, human activity, clothing level, age,
etc. Several criteria have been developed by the wind
engineering community for evaluating only the wind-
induced mechanical forces on the human body and the
resulting pedestrian comfort and safety. There are sig-
nificant differences among the criteria used by various
countries and research institutions to establish thresh-
old values for tolerable and unacceptable wind condi-
tions even if a single parameter, such as the wind speed,
is used as a criterion. These differences range from the
speed averaging period (mean or gust) and its prob-
ability of exceedance (frequency of occurrence) to the
evaluation of its magnitude (experimental or compu-
tational) (Blocken et al. 2012; Chronis et al. 2012;
Mochida and Lun 2008; Blocken and Persoon 2009;
Tominaga et al. 2008; Yoshie et al. 2007).
The presence of tall buildings influences wind speeds
at low level in their immediate surroundings. The ef-
fects on the local microclimate may be favourable or
unfavourable depending on the building shape, size,
orientation and interaction with neighbouring build-
ings or obstacles. The faster winds at high level may
be deflected down to ground level by tall buildings
causing unpleasant and even dangerous conditions for
pedestrians. Wind may be channelled around build-
ings, between buildings or along avenues causing accel-
erated wind speeds at pedestrian level and giving rise to
pedestrian discomfort. On the opposite end, suitably
arranged tall buildings may provide sheltered areas for
pedestrians, although this can lead to accumulation of
traffic fumes and/or other pollutants, if there is insuf-
ficient air circulation (wind speeds) (Tan et al. 2007;
Figure 1. Regions of high surface wind speeds around a tall building
132

Stathopoulos et al. 2004; Mohammadipour and Alavi
2009).
2.1 Typical Locations of Strong Wind in
Built up Areas
When a gust of wind strikes a tall building surface it
tends to deflect towards the ground causing high speed
winds on the windward side, as well as near the cor-
ners of the buildings at street/pedestrian level. Based
on strong wind, occurrences at pedestrian areas often
occur at the three regions shown in Figure 1 and are as-
sociated with the three types of flow (Emil and Robert
1996):
1. Type I : Vortex flow between buildings, near
ground level (region A),
2. Type II: Descending air flows passing around lee-
ward building corners (region B),
3. Type III. Air flows passing through openings
(passages) at ground level connecting the wind-
ward and leeward sides of buildings (region C).
2.2 Pedestrian Comfort
Pedestrian comfort criteria are based on mechanical
wind effects without consideration of other meteorolog-
ical conditions (temperature, relative humidity). These
criteria provide an assessment of comfort, assuming
that pedestrians are appropriately dressed for a spec-
ified outdoor activity during any given season. Five
pedestrian comfort classes and their corresponding gust
wind and speed ranges are used to assess pedestrian
comfort. More specifically, the comfort classes, associ-
ated wind speed ranges and limiting criteria are sum-
marized in Table 1 based on information from (Shane
2011).
2.3 Lawson’s Pedestrian Comfort Criteria
The acceptability of the wind conditions in an urban
environment will always be, to some extent, subjec-
tive. The following methodology, developed by Law-
son (1990). It has been widely accepted and adopted
for the investigations of the wind environment associ-
ated with buildings in the UK. It compares well with
international guidance. Locations in the areas of con-
cern associated with the buildings must be assessed for
both, comfort and safety. The first relates to the ac-
tivity of the individual and the second to the level of
distress experienced, based on information from Law-
son (1990), the wind comfort criteria are summarized
in Table 2.
2.4 Aim and Main Objectives of the Cur-
rent Study
The aim of this study is to provide a qualitative assess-
ment of the student and pedestrian comfort and safety
due to the likely wind conditions formulating around
the main Coventry University campus and especially
around the newly constructed Hub. The main objec-
tives were set as follows:
Table 1. Desirable pedestrian wind comfort classes for various location types
Comfort Classes Description Location Types (Examples)
Sitting Wwind ≤ 3.9m/s Occurrence: > 70% of the time. Outdoor Cafés, Patios, Terraces,
Acceptable for sedentary activities, including sitting. Benches, Gardens, Fountains, Monuments.
Standing Wwind ≤ 6.1m/s Occurrence: > 80% of the time. Building Entrances, Exits
Acceptable for standing, strolling, etc. Children’s Play Areas
Walking Wwind ≤ 8.3m/s Occurrence: > 80% of the time. Public/Private Sidewalks, Pathways,
Acceptable for walking, or rigorous activities Public/Private Vehicular Drop-Off Zones
Uncomfortable Wwind > 8.3m/s Occurrence: > 20% of the time.
Unacceptable for walking
Dangerous Wwind > 25m/s Occurrence: > 0.01% of the time.
Dangerous to walk
Table 2. Lawson pedestrian comfort criteria
Lawson Comfort Mean Wind Velocity Tolerable Tolerable
Classification Range (m/s) Location Activity
5 0-2 Seating areas in open air
cafes, parks
Pedestrians sitting for a long time and wind
velocity in the vicinity of entrance doors
6 and 7 2-6 Entranced to buildings Standing or sitting for a short time
8 6-8 Pedestrian footpaths, public
spaces, shopping areas
Pedestrian walking, e.g. strolling and sight-
seeing
9 8-10 Around buildings People at work (maintenance deliveries)
10 10-12 Roads and car parks Fast pedestrian waling, e.g. waling to a desti-
nation and cycling
133

1. To investigate the typical wind patterns around
the Hub and the resulting wind environment at
pedestrian level and to detect the so called “criti-
cal areas” and classify them according to Table 1,
below.
2. To identify the origin (source) of possible causes
of undesirable wind conditions.
3. In essence, to assess and quantify the wind gener-
ated around the campus and specifically near and
around the Hub and to advice on the effect this
predicted wind may have on the neighbourhood.
4. To generalise the findings by analysing, com-
menting and, if appropriate, revise certain wind
comfort criteria to suit the requirements for busy
city life and business usage.
3 MODELLING OF PROBLEM
Coventry University has changed dramatically in the
last few years. Among several new buildings, The Hub
distinguishes as it creates an architectural as well as
an environmental impact to the City of Coventry. The
particular building claims very high standards such as
low carbon footprint, low energy consumption (first
class insulation), flexibility in its use, functionality
(minimum number of columns), etc. However, none
has considered the effect this building has or has-not on
their occupants, such, as students and other pedestri-
ans outside and around it. Hence, the relation between
wind effects, wind comfort, wind danger and wind (lo-
cal) climate may be of interest.
Using the Fluent Code (Fluent Inc. 2007), the wind
generated around the campus and specifically near and
around The Hub will be assessed and quantified. The
typical wind flow pattern around the aforementioned
building and the related wind environment at pedes-
trian level will be investigated and discussed. Useful
comments will be drawn on the effect this predicted
wind may have on the neighbourhood. Online nugget
diameter control system for resistance spot welding
The CFD simulations were performed using the com-
mercial CFD code Fluent and the 3D steady RANS
equations. Closure was provided by the realisable
(k − ε) turbulence model (Shih et al. 1995) The choice
of this turbulence model was based on recommenda-
tions by (Franke et al. 2004) and on earlier success-
ful validation studies for pedestrian-level wind condi-
tions (Blocken and Persoon 2009) and (Blocken et al.
2004). Pressure velocity coupling was taken care off by
the SIMPLE algorithm (Launder and Spalding 1974).
Second order discretisation schemes were used for both
the convection terms and viscous terms of the govern-
ing equations. Simulations were performed for four
wind directions (0◦
, 90◦
, 180◦
, and 270◦
). The latter
were deemed to be sufficient to cover the most oner-
ous conditions. The iterations were terminated when
the scaled residuals showed very little further reduction
with increasing number of iterations. The minimum
residuals values were reached 10−8
for x, y, z-velocity
components, 10−7
for (k − ε) and 10−6
for continuity.
3.1 Assumptions
Various articles recommend the following generalised
boundary conditions for the simulation limits (Franke
et al. 2004; Blocken et al. 2004):
1. Symmetries on the edges and the upper surface
of the volume.
2. Pressure-outlet for the boundary leaving the sim-
ulation volume.
3. Variation of the wind speed profile with height,
at the air entrance of the simulation field.
4. Adoption of the wall function model for the treat-
ment of cells near solid walls.
3.2 Numerical Implementation
For treatment of areas close to “wall” surfaces such as
ground or building facades, there are two calculation
models in Fluent. Considering the complexity of our
simulations, the criterion for the choice of the “wall
function” model was based on the coarse mesh imple-
mentation, as opposed to that of the “two-layer ap-
proach”, hence, economising on the resources available
in Fluent. Essentially, for studies related to wind com-
fort at pedestrian level, it is appropriate to use smooth
surfaces for ground and buildings (zero height of rough-
ness). The total numbers of grid elements used in sim-
ulation are 355187.
Figure 2. Inlet mean wind speed profiles in the CFD simulation
134

Table 3. Lawson pedestrian comfort criteria
Turbulence Model Standard k − ε Model
Inlet U = Ug( Z
Zg
)α
, k =
u2
∗√
Cµ
, Cµ = 0.09, (z) =
u3
∗
kz
, k = 0.41
Outlet Gauge pressure=0
Bottom Smooth wall, using the log-law wall function, (Wall function)
Top Free slip, flux normal to the boundary is zero, symmetric boundary conditions is applied
Sides Free slip, flux normal to the boundary is zero; symmetric boundary conditions is applied
3.3 Boundary Conditions
The approaching wind was created from a power-law
model to approximate the mean velocity profile:
U = Ug(
Z
Zg
)α
(1)
where U = mean wind speed, Ug = gradient wind
speed, Z = high above ground, Zg = depth of the
boundary layer (gradient height, Zg = 40 m), and α
= power law exponent. The exponent α varies accord-
ing to the type of terrain; α = 0.14, 0.25 and 0.33 for
open country, suburban and urban exposures respec-
tively. All calculations in this article were based on
the value of α = 0.14 (Aynsley et al. 1977; He and
Song 1999). The variation of the inlet velocity at inlet
is shown in Figure 2.
Since the k − ε model was used, the values of k − ε
were required to account for the turbulence in the ap-
proaching wind. The turbulent kinetic energy k can be
calculated if the turbulence intensity at a given height
is known, α, the turbulence intensity of the inlet veloc-
ity profile is assumed to follow the Gaussian distribu-
tion with a standard deviation of α = 0.15.
k =
3
2
(U × I)2
(2)
where k is the von Kaman constant (k =0.41).
The other important value required is the dissipation
rate ε; which can be obtained from the assumption that
the wind is neutrally stratified and homogeneous in the
surface layer, where the rate of energy production is
approximately equal to its dissipation rate, therefore
(z) =
u3
∗
kz
(3)
where u∗ is the friction velocity. The u∗ was calculated
from
k =
u2
∗
Cµ
(4)
Based on Eq. (2) and Eq. (4), the boundary conditions
applied in the computing domain are summarized as
Table 3.
3.4 Local Meteorological Data for Coven-
try
The average annual local atmospheric wind conditions
for Coventry are shown in the wind-rose plotted in Fig-
ure 3, This is based on historical Meteorological Office
data taken from Coventry (Coleshill) and measured
over a 7-years period. It is obvious that southerly
winds dominate throughout the year, with easterly
winds being particularly infrequent (Cameron Taylor
Bradford Inc. 2005).
Figure 3. Historical wind-rose for Coventry (Coleshill)
135

(a) A view of the pedestrian area between the Hub
and James Starley building
(b) Coventry University central campus
map. The position of the Hub and James
Starley building is shown relative to each
other.
(c) Main dimensions of the buildings considered. (d) Finite volume (surface) mesh of the two build-
ings.
Figure 4. Geometrical and computational grid of the case study
4 CASE STUDY
The area under study is shown on the Coventry Uni-
versity campus. Figure 4 depicts the top and iso-views
with overall dimensions of the main building (Hub B1,
B2) and the building height of 20 m.
5 VELOCITY DISTRIBUTION FOR
WIND FLOW AROUND BUILDINGS
The velocity stream lines around the building were
studied using the CFD method. The results were pre-
sented for the mean wind speed, Vmean, at a pedes-
trian height of 1.5 m from ground level. The basic re-
sults from the CFD simulations for the proposed new
building are presented in Figures 5 - 8. These figures
show plan views of head level velocity streamlines for
prevailing wind speeds varying from 2 m/s to 16 m/s.
5.1 North Direction
Figure 5, northerly wind direction, shows wind velocity
above the prevailing wind speed especially between the
two main blocks. This creates an extended shelter zone
behind the buildings but also creates problems because
pedestrian wind discomfort arise underneath the main
building (Hub). The wind flow pattern at pedestrian
level between the two buildings is shown quite complex
with recirculation areas behind the buildings and large
velocity gradients near the main building, B1 (see Fig-
ure 4(d)). In addition, the leeward side of the building,
shows the formation of eddy flow (eddy currents devel-
oping), at the point where the two air streams meet,
following earlier splitting at the windward side. This
eddy flow is closer to the short side of the building.
136

Figure 5. Wind stream-line at pedestrian level (1.5 m above the ground) of the area
surrounding the Hub (North direction)
137

Figure 6. Wind stream line at the pedestrian level (1.5 m above the ground) of the
area surrounding the Hub (East direction)
138

surrounding the Hub (West direction)
139

surrounding the Hub (South direction)
140

Figure 9. Wind rose diagram for mean wind speed at pedestrian level; points 1,2 and 3
Figure 10. Area between the Hub and James Starley (building B3) before and during vegetation works
5.2 East Direction
In the case of East wind direction (Figure 6), near the
entrances to the buildings, the wind speed increases
owing to the narrow pass between buildings B1 and B3
(Bernoulli’s Principle). The most notable point to ob-
serve is the presence of local wind velocity above the
prevailing wind speeds (indicated by the yellow lines)
near all corners and between building blocks. The dis-
tribution of velocity around the building proves that
the air also splits at the windward side and meets at
the leeward side of building B3. The maximum veloc-
ity is present at the front corner of building B3 and at
pedestrian level.
5.3 North Direction
When the wind is blowing from West (Figure 7), the
velocity streamlines build up in the area surrounded
by buildings B1 and B2 and the most affected zones
are the corners of the upstream in building B1. at the
student pedestrian, the wind speed accelerate by 40%
higher than wind velocity can occur compared to the
reference wind speed at the pedestrian height.
5.4 South Direction
For Southerly winds (Figure 8), the most affected zones
are the area surrounding buildings B1 and B2 due to
the Venturi effect leading to wind speed accelerated by
40%. Also, at the building coroners, the wind speed
exceed by 50-60% those at reference wind speed.
6 ASSESSMENT OF WIND COMFORT
AND SAFETY
In order to evaluate the wind comfort in pedestrian,
Figure 9 shows CFD results at selected points between
buildings B1 and B3 (labelled as: 1, 2 and 3), at pedes-
trian level. It demonstrates that the peak “pedestrian”
wind speeds are higher when the wind direction is from
North, South and East, rather than West. This is be-
cause building B3 acts as an obstacle to westerly cur-
rents.
Also, when the wind direction is from the North or
South, it is clear that wind speeds at point 2, in the
middle and near the end of pedestrian path, are greater
than that at point 1, for all wind speed values. Yet,
when the wind blows from East, point 3 has the lower
peak value because of the location of building 2.
It is apparent that the identification of origin caus-
ing undesirable wind comfort depends on the building
141

design. So, optimisation of wind comfort to suit the
requirements for city life and commercial usage can be
important.
In general, solving a wind nuisance problem after the
design has been finalized can be difficult, expensive and
not very effective. Hence, wind environmental condi-
tions should be taken into account during the design
stage. Combining architectural design with considera-
tions for acceptable wind climate is often difficult. Af-
ter reading the report produced from this study the
University’s Estates Department took the results under
consideration. It was decided to introduce vegetation
with plants and trees in an effort to “break” the wind
and decrease the velocity at key areas specified in the
study (Figure 10).
7 CONCLUSION
This article has presented a CFD simulation for the
evaluation of pedestrian wind comfort and safety in
urban areas. The use of CFD in assessing and optimis-
ing engineering design solutions related to environmen-
tal concerns has been demonstrated through the case
study. From the preceding discussions, the following
conclusions can be made:
1. CFD is a powerful tool for evaluating critical ef-
fects of wind around buildings from the pedestri-
ans’ comfort point of view. It can also help to
quantify wind discomfort levels.
2. When two or more buildings are constructed in
proximity, the fluid flow surrounding the build-
ings may be significantly deformed and of a sig-
nificantly more complex nature than usually as-
sumed and needs to be investigated as early as
the planning stage of the project.
3. Knowing the strong dependence of comfort on
velocity and turbulence, it is of practical inter-
est to study these flow features associated with
certain building arrangements, typical of urban
areas and hence assess the comfort conditions on
the neighbour pedestrian circulations.
4. Solving a wind nuisance problem after the design
has been finalized may be time consuming and
costly. Therefore, it is stressed that wind en-
vironmental conditions should be taken into ac-
count before the design stage begins and the lay-
out of buildings should be decided accordingly.
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143

Cfd simulation for wind comfort and safety

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