CFD simulation of the wind field around pyramidal roofed single-story buildings
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Abstract
For the structural safety to counter the wind load, the roof shape and the roof slope both the constraints play an important role. The present study demonstrates the pressure distribution on the pyramidal roofs of a pentagonal and hexagonal plan low-rise single-story building due to the wind load through CFD simulation. This type of roofed building may be considered as one of the cyclone shelters as it is shown by post-disaster studies that pyramidal roof is found better than other roof shapes to resist the wind load. The modeling of the building and the meshing of the models have been carried out in ANSYS ICEM CFD, while the simulation process has been performed in ANSYS Fluent. To obtain the results, ANSYS CFD-Post has been utilized. For the simulation of the turbulent wind flow, a realizable k–ε turbulent model is used in the present study. In the current study, ten different building models (five with pentagonal plan and five with hexagonal plan) are generated having roof angles 20°, 25°, 30°, 35° and 40°, and all are simulated for 0°–45° wind direction @15° interval. The pressure coefficient contours for different wind directions for varying roof slopes are mapped in the present study. Results show that the hexagonal pyramidal roof surface building has low-pressure coefficients and better chances of survival than the pentagonal pyramidal roof surface building.
Keywords
Wind pressure Pyramidal roof Roof slope Computational fluid dynamics (CFD) Mean pressure coefficients Velocity streamlinesMathematics Subject Classification
37N10 76N20 74A501 Introduction
Different types of roofed buildings are widely used in coastal areas of India as well as all around the world. All these roofed buildings are exposed to the atmospheric wind and experience a significant wind load. As the wind has both advantageous and dangerous aspect, on the one hand it is beneficial as it has huge power potential [1, 2, 3] and helpful for ventilation [4] and on the other hand it loads the structures which come in its way. The past cyclone reports for Bhola Cyclone 1970, Bangladesh Cyclone 1991, Cyclone Nargis 2008, Hurricane Arthur 2014 and Cyclone Hudhud 2014 have shown a huge loss of lives and properties [5, 6, 7, 8, 9]. The wind-resistant structures can save lives and prevent property damage during cyclones, and the present study is an effort in the same direction. The key objectives of the present study are to investigate the variation of pressure coefficients on the pyramidal roof surface and to compare the same with the pressure coefficients on hip roof, as the hip roof is similar to pyramidal roof.
In oldfangled roofing arrangements, suctions due to high wind can cause key destruction, and it can cause subsequent intrusion of rain water and damage of inner elements [10]. So, the consideration of the wind load for the structural design along with other types of loads seems mandatory. The roof shape, roof slope and the wind direction play an important role in structural safety of buildings to counter the wind load [11, 12]. In a wind tunnel study, it was found that changes in the wind incidence angle may induce dissimilar pressures on different outside surfaces of a structure with the “+”-shaped plan [13].
The wind load investigation of building can be performed through wind tunnel testing or wall of wind study (WOW), but these experimental studies are time-consuming and expensive and require a lot of effort. Also the availability of experimental setup, i.e., wind tunnel and WOW, is very limited. So, to overcome all these limitations of experimental study, a substitute is required for the same. At present, CFD simulations or numerical analysis is good alternative to experimental study to govern the impact of wind load on structures [14, 15, 16, 17].
In computational fluid dynamics, i.e., CFD, numerical analysis is utilized to find solutions to various problems involving fluid flows [18, 19]. CFD is a numerical analysis which can be used for both two-dimensional (2D) and three-dimensional (3D) problems. Similar to CFD, there are other methods too for the numerical analysis of 2D, 3D and 4D problems such as hybrid orthonormal Bernstein, block-pulse functions wavelet method, time-fractional Benjamin–Ono (BO) equation, Boiti–Leon–Manna–Pempinelli equation and Haar wavelet method [20, 21, 22, 23, 24, 25]. Thus, CFD may be defined as the use of applied mathematics, physics and computational software to evaluate the fluid flow behavior [26]. So, the present study is carried out by using numerical simulation.
In design and research, CFD decreases both cost and time and it delivers visualized and thorough information [27], and lots of wind load studies have been carried out by numbers of researchers using ANSYS Fluent [19, 28, 29, 30, 31, 32]. This software is novice-friendly while remaining highly accurate and quick [33]. Also, in the last five decades, CFD has evolved into an influential apparatus for the research work in structural aerodynamics [34]. As an alternative to wind tunnel experiments, a reasonable amount of research studies have been performed through CFD simulation, and CFD results have shown a good agreement with the experimental outcomes [35, 36, 37, 38, 39].
ANSYS CFD has a few number of methods or turbulent models for the simulation of geometric models such as SST model, k–ε model, LES model and k–ω model. And for the present study which is an atmospheric boundary-layer study, a realizable k–ε model has been used because of its suitability [40, 41, 42]. The past studies show the efficiency of the method.
When it comes to analytical study of wind load, there are wind codes too to get the wind pressure coefficients for various roof shapes directly. Different countries have their wind codes for evaluating wind loads such as Indian wind code IS 875 (Part 3), Australian and New Zealand wind code AS/NZS 1170.2:2011 [43], Japanese wind code AIJ Recommendations for Loads on Buildings, British wind code BS 6399-2: 1997 and American wind code ASCE/SEI 7-10 [44, 45, 46, 47, 48]. These code provisions include the pressure coefficients on gable roof, hip roof, multi-span gable roof, canopy roof, saw-tooth roof and mono-slope roof. None of the codes mentioned above has the information regarding pyramidal roofed buildings with varying heights.
This review of the literature shows that the maximum studies till date are related to low-rise buildings with gable roof, hip roof, multi-span gable roof, canopy roof, saw-tooth roof, mono-slope roof and dome-shaped roofs. So, the research work related to the pyramidal roofed buildings is very limited till the date.
As the similar studies on pyramidal roofed buildings have already been carried out in the past but in all those studies, the building models were with square or rectangular base, while in the present study the base has a shape of regular polygon. And by doing this, the effect of change in base shape has been investigated for pentagonal and hexagonal pyramidal roofed building models.
The pressure coefficient on both the pyramidal roofs from existing study has been compared with the pressure coefficient on hip roof from European Wind Standard and Indian Wind Standard, and both the pyramidal roofs are found better than hip roof again. So, the present study recommends the pyramidal roof for the construction in cyclone-prone regions. When it comes to wind pressure variation on pitched roofs, the roof slope play an important role, and the same may be noticed in wind standards of various countries. In the current study too, the suction decreases with the increase in roof slope.
Hence, in the present study, the influence of the roof slope on wind pressure distribution on roof surface of pyramidal roofed single-story buildings is examined thorough CFD simulation. In the existing study, the simulation is performed by using realizable k–ε turbulent model and the authentication has been carried out with earlier printed wind tunnel experimental data from the study carried out by David et al. [27].
Firstly, the wind tunnel experimental data used in the present study are described in Sect. 2. Then, the setting of computational domain, model dimensions, mesh type and mesh quality, boundary conditions and solver setting all are presented in Sect. 3. The outcomes which mainly include pressure coefficients and a comparison between pressure coefficients for different roof slopes are discussed in Sect. 4. Afterward, a comparison of pressure coefficient values with codal values is given in Sect. 5. And at the end of this manuscript, in Sect. 6 there is a conclusion for the existing study.
2 Wind tunnel experimental data used
David et al. [51] carried out wind tunnel experiments in an open-circuit ABL wind tunnel at IIT Roorkee, India. The ABL wind tunnel with a trial section of 15 m length has area of cross section 2.1 × 2.0 m^{2}, and the wind velocity of 18 m/s can be attained. From this experimental study, the mean wind velocity and the turbulence intensity profile along wind direction has been utilized for the CFD simulation and validated.
With a power-law exponent (α = 0.14) for the velocity profile, the present study has 18% turbulence intensity along wind direction and 8 m/s mean velocity values at the model’s eave height (H). The linear length scale of turbulence (L_{ux}) was obtained by computing the area under the autocorrelation curve of the oscillating velocity component, and L_{ux} is nearly 0.45 m at a height H of 195 mm, which is almost 45 m as the corresponding full-scale L_{ux}.
3 CFD simulation: setting of computational domain and criterion
The settings of computational domain and criterion for the present study are illustrated in this section. These criterion and settings have been utilized for the sensitivity evaluation (mesh resolution, turbulence model, inlet turbulent kinetic energy), which are given in Sect. 4.
3.1 Computational domain and meshing
ANSYS ICEM CFD tool is used to produce advanced geometry and mesh of the model. An additional advantage of ICEM CFD is that it can create its own geometry or can import geometry via external CAD software. In this study, since our structural design was relatively simple, we have created geometry using ICEM CFD [53]. Two separate single-story building models with a pyramidal roof are generated in ICEM CFD. The base area of the building model is identical to the one in the study carried out at CBRI, Roorkee (India) [54]. The dimensions of the building models and domain geometry are shown in Fig. 2. Once the domain of the model is defined, the next step is to create the geometry of the building model within the domain in ICEM CFD.
For simulation work, it is necessary to distribute the whole domain volume into small cells also known as meshing. A hexahedral type of mesh is simple to generate and also gives good results. So, a structured hexahedral grid was used for meshing. The mesh was created with refined grid near the model as shown in Fig. 3 for getting more accurate results.
To get good results and a simpler simulation process, the mesh quality should be more than 0.5, which is considered as good. The mesh quality must be checked thoroughly for each and every model. The mesh quality for all the models was found above 0.6 in each case. On a scale of 0.0–1.0 in ICEM CFD, the mesh quality can be checked as shown in Fig. 3 (lower side). The bottom part of figure shows a bar chart for quality check. After the quality check, the mesh was converted into unstructured mesh, since the simulation is carried out using ANSYS Fluent in the current study, and it supports only unstructured mesh.
3.2 Boundary condition
From Fig. 4, it can be seen that the wind tunnel velocity and the turbulence intensity profiles represent two different trend lines with equations y = 1.0559ln(x) + 4.7636 and y = 0.7554x − 0.297, respectively, and are used as user-defined function (UDF) at the inlet boundary to generate the boundary-layer flow throughout the domain. The computational domain’s top and the side walls are demonstrated as slip walls (nil normal wind velocity and nil normal gradients of entire variables). The static pressure is stated as zero at the outlet.
3.3 Solver settings
The principal equations and the related problem-specific boundary circumstances are solved through the finite volume method in Fluent. The basic principle behind the use of finite element method is that the model is subdivided into minor isolated parts which are called finite elements. The stiffness matrix size is determined by only the numeral of nodes and the outcomes are amended by increasing the nodes amount and collocation points [56]. The elements collectively make an overall matrix, and each element of the matrix has governed equations in Fluent.
As it is specified previously, the solutions are steady state, and the second-order differencing is used for the momentum, turbulence equations and pressure, and because of the robustness for steady-state and single-phase flow problems, the “coupled” pressure–velocity coupling method has been used. For the convergence state, the residuals must be fallen below the usually applied benchmarks of falling to 10^{−4} from their preliminary values afterward more than a few hundred iterations.
4 Outcomes and discussion
In the current study, pyramidal roofed structure models with pentagonal and hexagonal plan have been simulated through CFD by varying roof slopes. To determine the effect of roof slope on wind pressure distribution on roof surface is the key objective of the existing study. And this is carried out by plotting the wind pressure coefficient contours in ANSYS Fluent.
4.1 Contours of pressure coefficients
In all the pressure coefficient contours, red color shows the highest positive pressure coefficients and the values lie between 0.54 and 0.57, while the highest negative pressure coefficient is shown by dark blue color and it lies between − 1.3 and − 2.0. Yellow color displays the contours of pressure coefficients lower than the highest positive pressure coefficient, and similarly, sky blue color represents the contours of pressure coefficients lower than highest negative pressure coefficient. And the values of pressure coefficients between the values shown by yellow and sky blue colors are represented by green color.
From pressure coefficients contours in Fig. 5, it can be observed that the negative pressure coefficient or suction increases with the increase in roof slope, while positive pressure coefficient has little fluctuation due to the change in roof slope for both the plan shapes. The highest suction was found near the ridge line (that separates windward face and leeward face) of the roof surface for all roof slopes.
As the roof slope increases, the region of roof surface where wind strikes directly also increases, and this results in larger positive pressure region. The same thing happens with the negative pressure coefficient, and the value increases with the increase in roof slope.
The highest maximum positive pressure coefficient and negative pressure coefficient for the pentagonal roof surface are found for 20° roof slope for 30° wind angle and for 40° roof slope for 45° wind angle, respectively, while the lowest maximum positive pressure coefficient is found for 30° roof slope for 0° wind angle and the lowest maximum negative pressure coefficient (suction) is found for 20° roof slope for 15° wind angle.
In case of hexagonal roof surface, the highest maximum positive and negative pressure coefficient was found for 20° roof slope for 15° wind angle and for 40° roof slope for 0° wind angle, respectively. And the lowest maximum positive and negative pressure coefficient was found for 40° roof slope for 30° wind angle and for 20° roof slope for 0° wind angle, respectively.
5 Comparison with codal values
Comparison between numerical values and codal values of pressure coefficients
Roof slope | C_{p} for pentagonal pyramidal roof (numerical study) | C_{p} for hexagonal pyramidal roof (numerical study) | C_{p} for hip roof (Indian standard for wind load) | C_{p} for hip roof (European standard for wind load) |
---|---|---|---|---|
20° | − 0.420 | − 0.400 | − 0.880 | − 0.700 |
30° | − 0.404 | − 0.408 | − 0.520 | − 0.600 |
40° | − 0.303 | − 0.385 | − 0.400 | − 0.510 |
From Table 1, it is clear that pyramidal roofs with the pentagonal and hexagonal plan are better than hip roof. We can see that the numerical values computed for pyramidal roofs differ to varying extents from the standard values obtained from the Indian Standard IS875 (part 3) and European Standard EN1991 for hip roof [10, 26]. These differences are mostly due to the fact that there are no standard data about pyramidal roof structures. The magnitude of pressure coefficients decreases with increasing roof slope for pentagonal pyramidal roofed building, while in case of hexagonal pyramidal roof pressure coefficient values are almost same for all three roof slopes. It may be observed that the pentagonal pyramidal roof with a slope of 40° is optimal from a wind load point of view.
6 Conclusions
The highest maximum positive pressure coefficient and negative pressure coefficient for the pentagonal roof surface are found for 20° roof slope for 30° wind angle and for 40° roof slope for 45° wind angle, while the lowest maximum positive pressure coefficient and negative pressure coefficient are found for 30° roof slope for 0° wind angle and for 20° roof slope for 15° wind angle, respectively.
In case of hexagonal roof surface, the highest maximum positive and negative pressure coefficient is found for 20° roof slope for 15° wind angle and for 40° roof slope for 0° wind angle, respectively. And the lowest maximum positive and negative pressure coefficient is found for 40° roof slope for 30° wind angle and for 20° roof slope for 0° wind angle, respectively.
As the roof inclination is increasing, negative pressure coefficient or suction is also increasing, while positive pressure coefficient has little fluctuation for both the plan shape.
The highest suction is found near the ridge line (that separates windward face and leeward face) of the roof surface for all roof slopes.
For low roof slope, most of the roof surface has negative pressure or suction and a small section only experiences positive pressure. This is because these low slope angles resemble a flat roof. Thus, the suction would be the major pressure in this situation. However, with increasing roof slope, the surface area under negative pressure or suction decreases, while the roof surface area under positive pressure increases.
Overall, the highest maximum positive pressure coefficient was found for hexagonal roof surface with 20° roof slope for 15° wind angle with a magnitude of 0.584 and the highest maximum negative pressure coefficient was found for pentagonal roof surface with 40° roof slope for 45° wind angle with a magnitude of 2.235.
When a pyramidal roof is compared with hip roof (from wind standards), it may be observed that the pentagonal pyramidal roof with a slope of 40° is optimal from a wind load point of view.
In the present study, it was found that the hexagonal pyramidal roof surface building has low-pressure coefficients and better chances of survival than the pentagonal pyramidal roof surface building. This may be because the hexagonal plan shape roof has more faces than pentagonal roof surface, and this causes the better distribution of wind over the roof surface.
Notes
Acknowledgements
I would like to express my special thanks and gratitude to my institute NIT Hamirpur, HP, for providing resources as well as Ministry of Human Resource Development, India, for providing research assistantship.
Funding
For the present study the funding is provided by Ministry of Human Resource Developement (MHRD) India, in form of Ph.D. assistantship.
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
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