Large eddy simulation of natural ventilation for idealized terrace houses due to the effect of setback distance

Tuan, Le Xuan; Razak, Azli Abd; Zaki, Sheikh Ahmad; Mohammad, Ahmad Faiz; Hassan, M. Kabir

doi:10.1088/1757-899x/88/1/012009

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…Many researchers have utilized the aerodynamic potential of building façades to investigate their enhancement effect on indoor and outdoor airflow exchanges for both single-sided and cross ventilation buildings. Typical building façades include a wind catchers [9][10][11][12][13] venturi-shaped roof [14,15], wing walls [16], a ventilation shaft [17], a balcony [18][19][20][21] and eaves [22][23][24][25], while other researchers focused on the influences of external factors on ventilation rates and indoor air patterns such as sheltering building [26][27][28][29][30] and external landscape [6,31].…”

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confidence: 99%

“…They concluded that any change in these factors can significantly affect the boundary conditions and consequently the indoor airflow parameters such as pressure, velocity magnitude and distribution pattern. Tuan et al [29] investigated the impact of the sheltered building on the natural ventilation and flow pattern of a downstream building in tropical regions. It was found that the possibility of ventilation was increased by increasing the sheltered distance.…”

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confidence: 99%

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Impact of an external boundary wall on indoor flow field and natural cross-ventilation in an isolated family house using numerical simulations

Hawendi

Gao

2017

Journal of Building Engineering

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The external boundary wall is a main architectural feature of a typical residential building in Iraq, which is expected to decrease the rate of airflow entering the openings of the building. In this study, the impact of an external boundary wall on natural cross-ventilation and flow patterns inside an isolated family house was analyzed using computational fluid dynamics (CFD) simulations.The wall was located in front of the building and three different conditions were tested: basic case (without a wall) and two cases using walls of different heights. The study employed the techniques of large eddy simulation (LES) with the dynamic Smagorinsky subgrid-scale model because of the unsteady flow and high turbulence around the building. The CFD simulations were validated against the available wind tunnel experiments. It was observed that the external boundary wall created well distributed indoor air flow and improved the indoor environment regarding the mean velocity inside the building. Also, increasing the height of the wall by 20% did not offer noticeable improvement on the mean velocity distribution, whereas the ventilation airflow rate was reduced significantly to less than half when the wall was present. The results of this study are expected to inform building designers of the impact of an external boundary wall on the flow patterns in relation to the rate of ventilation and indoor mean velocity. Rate of dissipation of turbulent kinetic energy(m 2 /s 3 ) Von Karman constant Dynamic viscosity(kg/m.s) Turbulent viscosity (Pa.s) Kinematic viscosity(m 2 /s) Density(kg/m 3 ) Rate of strain tensor Subgrid-scale stress Volume of the computational cell

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confidence: 99%

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confidence: 99%

Impact of an external boundary wall on indoor flow field and natural cross-ventilation in an isolated family house using numerical simulations

Hawendi

Gao

2017

Journal of Building Engineering

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“…As previously studied by Mohamad et al [15] and Tuan et al [17] the building model that was represented in this study is a basic intermediate single-storey terraced house as in Figure 1. The model was scaled down to a ratio of 1:50 to the actual dimensions.…”

Section: Building Modelsmentioning

confidence: 97%

“…The wind tunnel has 9 fan-blades powered by an AC motor of 37 kW / 50 HP with a maximum speed of 20 m/s. For this experiment, with the model was placed within the test section, the inlet velocity was set to 5 m/s [15,17]. The schematic diagram of PIV experimental setup can be seen in Figure 2.…”

Section: Piv Setupmentioning

confidence: 99%

Cross Ventilation Analysis on the Effect of Setback Distance of a Terraced House Using Piv

et al. 2015

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Urban development has become very alarming with the rise of population especially in regions with weak wind such as countries in the tropics like Malaysia. The highly dense structures make it difficult to provide effective ventilation from heat, pollutions, dusts and even bacteria. With time, it will caused the urban area to become ‘sick’. Due to this, building arrangement plays an important part in predicting airflow structure and the effectiveness of ventilation from the developed airflow. Through this study, the effects of the setback distance arrangement, d, on the cross ventilation of two cascading terraced houses were analyzed. Based on the flow structure, the possibility of the negative effects from the upstream house carried in to the downstream house was also observed. The study was conducted experimentally using Particle Image Velocimetry (PIV) with the aid of INSIGHT 4G for post-processing analysis. It was found that the most ideal setback distance was d = 0.5H even though a higher H/W threshold ratio of the street canyon allowed the transition of wake interference flow to isolated roughness flow. Apart from that, the provided setback distance, d, can give sufficient ventilation on the downstream building.

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“…The other reason for the decline in ventilation rate was that the internal friction from turbulent flow caused a 'sluggish zone' with a low wind speed inside the building when the building length was greater than five times its height. Tuan et al [30] used LES to investigate the impact of the downstream construction of terraced houses on nearby, upstream houses, and the flow patterns inside them. Recently, an in-depth comparison between five different steady RANS models and LES has been performed by van Hooff et al [31] to determine which CFD model is the most suitable for cross-ventilation flows in a generic, isolated building.…”

Section: Introductionmentioning

confidence: 99%

Impact of windward inlet-opening positions on fluctuation characteristics of wind-driven natural cross ventilation in an isolated house using LES

Hawendi

Gao

2017

International Journal of Ventilation

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Large eddy simulation of natural ventilation for idealized terrace houses due to the effect of setback distance

Cited by 3 publications

References 3 publications

Impact of an external boundary wall on indoor flow field and natural cross-ventilation in an isolated family house using numerical simulations

Impact of an external boundary wall on indoor flow field and natural cross-ventilation in an isolated family house using numerical simulations

Cross Ventilation Analysis on the Effect of Setback Distance of a Terraced House Using Piv

Impact of windward inlet-opening positions on fluctuation characteristics of wind-driven natural cross ventilation in an isolated house using LES

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