Porous media representation of louvers in building simulations for natural ventilation

Ooi, Chin Chun; Chiu, Pao‐Hsiung; Raghavan, Venugopalan S. G.; Wan, Stephen; Poh, Hee Joo

doi:10.1080/19401493.2018.1510544

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Other studies can also be found in the literature, such as the experimental and numerical study of the cross ventilation of a building equipped with louvers in four cases of open position in four cases of opening position (openings in the center of the windward and the leeward, at the top, at the bottom and an opening at the top of windward and the other at the bottom of the leeward) [20], a 3D simulations were performed in steady state using Reynolds Averaged Navier-Stokes, with RNG k-ε, k-ω SST and RSM turbulence models, the numerical results have been validated with experimental data and the best agreement was given by the RSM model for the studied case [20], The highest dimensionless air flow rate is obtained in the first case (opening with louvers at the top of the walls) and 45% of air renewal rate is obtained for the first case (openings with louvers in the center of the windward and the leeward) [20]. In the same context, a quantification of the velocity and pressure deviation was investigated numerically by Chinchun et al [21] by numerical simulation of natural ventilation and effect of the porosity of the openings analysis (number of louvers N=7, N=15 and their incidence angle of 30, 45 and 60°) on dynamic parameters of the cross-ventilation, particularly the horizontal velocity component and the jets angles. Otherwise, Arinami et al [22], studied the impact of the guide vanes (GVs), installed in the center of the openings, and the adjacent obstacles (installed at the openings lateral extremity) on the ventilation efficiency and air change rate in a building model, it was confirmed that the dynamic parameters of ventilation were considerably influenced by the presence of obstacles and guide vanes [22].…”

Section: Introductionmentioning

confidence: 86%

Numerical Investigation of the Interaction between the Thermal and Dynamic Effects of Cross-Ventilation for a Generic Isolated Building

Benlefki

Hamel

Medjahed

2021

DDF

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An efficient air ventilation requires knowledge of the complex interaction between the dynamic behavior and thermal parameters. For an isolated building the exact estimation of the interaction between the dynamics of cross-ventilation flow and a convective heat transfer, by overheating one of its internal walls, is an interest way to control the internal temperature’s distribution and the energy consumption of the ventilation system. The numerical simulation may provide an approximate solution to predict this kind of phenomenon. In this study, a numerical investigation of the thermal effect of a heated wall on a cross-ventilation for a generic isolated building with two parallel openings with a same dimension and at the same height is presented. The heat source is considered as solar radiation when it heats the exposed wall of the building. The wall temperature is assumed to be constant and homogeneous and it takes three values 25, 30 and 35°C. The highly three-dimensional flow is obtained by solving numerically the Reynolds averaged equations of mass, momentum and energy conservation for incompressible flow. The k-ω SST turbulent model is used to solve the turbulent quantities. The numerical results are validated by comparison of the horizontal component of velocity and the turbulent kinetic energy with the corresponding measurements. A detailed analysis of the interaction between the dynamic and thermal parameters is carried out and led to conclude that the distribution of the air temperature in the building is much influenced by the incoming fresh air jet. In its region the temperature difference between the air inside and outside the building is almost zero, however, below the jet region, characterized by air recirculation flow, the temperature takes its maximum value for the tree studies cases. Also, the thermal effects of air buoyancy may modify the dynamic behavior, especially at the building entrance, this modification is proportional to the wall temperature and it disappear after mid distance of the flow in the building.

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Section: Introductionmentioning

confidence: 86%

Numerical Investigation of the Interaction between the Thermal and Dynamic Effects of Cross-Ventilation for a Generic Isolated Building

Benlefki

Hamel

Medjahed

2021

DDF

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“…Meanwhile, ref. [25] proposed empirical relations to derive resistance coefficients. However, no in-depth investigation on the behaviour of louvers under varying inflow conditions was presented.…”

Section: Current Modelling Practicementioning

confidence: 99%

A Method to Evaluate Forchheimer Resistance Coefficients for Permeable Screens and Air Louvers Modelled as a Porous Medium

Marykovskiy,

Pomaranzi,

Schito

et al. 2024

Fluids

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Porous medium models are commonly used in Computational Fluid Dynamics (CFD) to simulate flow through permeable screens of various types. However, the setup of these models is often limited to replicating a pressure drop in cases where fluid inflow is orthogonal to the screen. In this work, a porous medium formulation that employs a non-diagonal Forchheimer tensor is presented. This formulation is capable of reproducing both the pressure drop and flow deflection under varying inflow angles for complex screen geometries. A general method to determine the porous model coefficients valid for both diagonal and non-diagonal Forchheimer tensors is proposed. The coefficients are calculated using a nonlinear least-squares optimisation based on an analytical solution of a special case of the Navier–Stokes equations. The applicability of the proposed method is evaluated in four different scenarios supplemented by local CFD simulations of permeable screens: wire mesh, perforated screens, air louvers, and expanded mesh panels. The practical application of this method is demonstrated in the modelling of windbreaks and permeable double-skin facades, which typically employ the aforementioned types of porous screens.

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“…Ye et al [12] proposed a statistic-based methodology to determine drag coefficients of calcareous sand soil. Ooi et al [13] presented a model based on the Darcy-Forchheimer law to determine parameters for louvers. Nezhad et al [14] explored the effects of porous media particle size on inertial and viscous forces.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Flow Rate Characteristics of Porous Media Under the Positive Pressure and Vacuum

Wang

et al. 2023

Preprint

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Porous media representation of louvers in building simulations for natural ventilation

Cited by 10 publications

References 26 publications

Numerical Investigation of the Interaction between the Thermal and Dynamic Effects of Cross-Ventilation for a Generic Isolated Building

Numerical Investigation of the Interaction between the Thermal and Dynamic Effects of Cross-Ventilation for a Generic Isolated Building

A Method to Evaluate Forchheimer Resistance Coefficients for Permeable Screens and Air Louvers Modelled as a Porous Medium

Determination of the Flow Rate Characteristics of Porous Media Under the Positive Pressure and Vacuum

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