Air flow around isolated gable-roof buildings with different roof pitches: Wind tunnel experiments and CFD simulations

Tominaga, Yoshihide; Akabayashi, Shin-ichi; Kitahara, Toshihiro; Arinami, Yuki

doi:10.1016/j.buildenv.2014.11.012

Cited by 205 publications

(107 citation statements)

References 36 publications

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“…Summary of the boundary conditions are shown in Table 1 and Table 2. The comparison of our results with [38] is presented in the Appendix section. …”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The profiles of the airflow velocity U and turbulent kinetic energy k were imposed at the inlet which were based on [38], with the streamwise velocity of the approaching flow obeying the power law with an exponent of 0.25 which corresponds to a sub-urban terrain. The velocity at H was 1.54m/s.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The values selected for sand-grain roughness height and a roughness constant 1.0 mm and 1.0 [38]. The sides and the top of the domain were established as symmetry boundary conditions, indicating zero normal velocity and zero gradients for all the variables at the side ant top wall.…”

Section: Boundary Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Nejat

Calautit

Majid

et al. 2016

Building and Environment

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“…Summary of the boundary conditions are shown in Table 1 and Table 2. The comparison of our results with [38] is presented in the Appendix section. …”

Section: Boundary Conditionsmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Nejat

Calautit

Majid

et al. 2016

Building and Environment

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“…10a) and turbulent kinetic energy k (Fig. 10b) were imposed at the inlet which were based on [38], with the streamwise velocity of the approaching flow obeying the power law with an exponent of 0.25 which corresponds to a sub-urban terrain.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Evaluation of a two-sided windcatcher integrated with wing wall (as a new design) and comparison with a conventional windcatcher

Nejat

Calautit

Majid

et al. 2016

Energy and Buildings

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In buildings, 60% of energy consumption is associated to HVAC systems. One solution to reduce this share is the application of natural ventilation systems. Windcatcher and wing wall are two well-known techniques for natural ventilation which have been used in different regions. Nevertheless, in areas with low wind speed such as tropical climate of Malaysia there is hesitation for application of natural ventilation systems. The integration of windcatcher with wing wall can potentially enhance the ventilation performance. However, this configuration was not looked into by pervious investigations; thus, this study aims to address this gap of research by evaluating: first, the effect of wing wall angle on the ventilation performance; second, comparethe performance of this new design with a conventional windcatcher. This research had two main investigative steps: experimental scaled wind tunnel testing and CFD simulation. Four reduced-scale models of two-sided windcatcher were tested in a low speed wind tunnel. Three models were integrated with wing wall in 30°, 45° and 60° incident angles and the another windcatcher was a conventional two-sided windcatcher, which is typical in regions with predominant wind direction. The CFD validation against experiment showed a good agreement. The best operation was observed in the windcatcher with 30° wing wall angle which could supply 910 l/s fresh air into the room in 2.5 m/s wind speed. Hence, the new design had 50% more ventilation performance comparing with conventional two-sided windcatcher in the same external wind speed. Finally, it was concluded that this new design can satisfy requirements of ASHRAE 62.1.

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“…CFD analyses make it possible to tackle the issues concerning wind impact by determination of parameters for air flow around and on the surface of objects, e.g., velocity distribution or pressure coefficients. This topic was discussed in [18] and [19].…”

Section: Introductionmentioning

confidence: 99%

Coupled Finite Volume and Finite Element Method Analysis of a Complex Large-Span Roof Structure

Szafran

Juszczyk

Kamiński

2017

International Journal of Applied Mechanics and Engineering

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The main goal of this paper is to present coupled Computational Fluid Dynamics and structural analysis for the precise determination of wind impact on internal forces and deformations of structural elements of a longspan roof structure. The Finite Volume Method (FVM) serves for a solution of the fluid flow problem to model the air flow around the structure, whose results are applied in turn as the boundary tractions in the Finite Element Method problem structural solution for the linear elastostatics with small deformations. The first part is carried out with the use of ANSYS 15.0 computer system, whereas the FEM system Robot supports stress analysis in particular roof members. A comparison of the wind pressure distribution throughout the roof surface shows some differences with respect to that available in the engineering designing codes like Eurocode, which deserves separate further numerical studies. Coupling of these two separate numerical techniques appears to be promising in view of future computational models of stochastic nature in large scale structural systems due to the stochastic perturbation method.

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Air flow around isolated gable-roof buildings with different roof pitches: Wind tunnel experiments and CFD simulations

Cited by 205 publications

References 36 publications

Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Anti-short-circuit device: A new solution for short-circuiting in windcatcher and improvement of natural ventilation performance

Evaluation of a two-sided windcatcher integrated with wing wall (as a new design) and comparison with a conventional windcatcher

Coupled Finite Volume and Finite Element Method Analysis of a Complex Large-Span Roof Structure

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