CFD Evaluation of Philippine Detached Structure with Different Roofing Designs

Abstract

The Philippines is located in the typhoon belt region in the western side of the Pacific Ocean. Every year, an average of twenty typhoons pass through the country, resulting in the loss of life and property. As the design of the roofing is an important factor in the structural integrity of the detached structures and the survival of the occupants, an evaluation of different roofing designs for the detached structure is needed. Different roofing designs, typical in Philippine detached structures were investigated using the computation fluid dynamics (CFD). The developed CFD model was validated based on the data from full scale and wind tunnel results. The different roofing designs were evaluated in the developed and validated model based on the flow field, pressure coefficients and streamlines at different wind angles. The results show that different roofing designs affect the flow field velocity, flow field pressure coefficient and the structure's surface pressure coefficients. The pyramidal and domed roofing designs have a smoother flow field velocity, flow field pressure coefficient and house surface pressure coefficient. The eaves overhang, which is common in Philippine detached structures, has a large effect on the surface pressure coefficient and the velocity streamlines, as compared to structures with no eaves overhang. The results of this study show the importance of the roof design in Philippine detached structures.

CFD Evaluation on the Pre- and Post- Renovation, and Windows and Doors Opening, of a Typical, Walled, Detached Family House in the Philippines

“…Previous studies show that it is very important to do parametric studies of the computational grid [24][25][26]. Hence, this study conducted several parametric studies before deciding to use the computational grid as we did in our previous studies [17]. Figure 4a shows the wind velocity at different heights.…”

“…Figure 3 shows the computational model preparation utilized in this study. It shows the computational domain, boundary conditions, and computational grid generated using the very fine and unstructured mesh with five layers [17]. The modeling and configuration of the computational domain for the present study is shown in Figure 4.…”

“…In this research, the compressible steady-state Reynolds-Averaged Navier Stokes (RANS) equations were solved using the finite volume method-based OpenFoam solver [19] incorporated in simFlow software [20]. The OpenFoam computational fluid dynamics solver has been used and validated by many researchers [17]. Based on several studies, the solver can replicate the results from different major computational fluid dynamic softwares [21].…”

“…This paper presents the first application of the computational fluid dynamics (CFD) in the analysis and evaluation of the wind field around and inside the walled, detached family house in the Philippines, to visualize and understand the effect of the parameters affecting the wind field around and inside the house using the developed and validated model presented in our previous paper [17]. Our previous paper shows the developed CFD model that was validated based on the data from full scale and wind tunnel results.…”

“…In hot and humid tropical climates, some studies and regulations are considering the usage of natural ventilation to minimize energy consumption [12][13][14][15][16]. In the Philippines, the detailed design and analysis of residential buildings and houses, taking into consideration natural ventilation, is not currently considered due to shortcomings in regulations and understanding in the field [2,17].…”