Determination of a Methodology to Derive Correlations Between Window Opening Mass Flow Rate and Wind Conditions Based on CFD Results (original) (raw)
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Applied Mechanics and Materials, 2014
Wind-induced ventilation is widely acknowledged as one of the best approaches for inducing natural ventilation. Computational fluid dynamics (CFD) technique is gaining popularity among researchers as an alternative for experimental methods to investigate the behavior of wind-driven ventilation in building. In this present paper, Reynolds averaged Navier-Stokes equation (RANS) k-ε model approach is considered to simulate the airflow on a simplified cubic building with an opening on a single façade. Preliminary simulation using models from previous experiment indicates the reliability of OpenFOAM, the open source software that will be used in this study. The results obtained in this study will better define options for our future study which aims to explore how different buildings arrays modify the airflow inside and around a naturally ventilated building.
CFD Analysis of Wind-Driven Natural Ventilation in Building Models
IJERAT, 2021
This paper studied wind-driven natural ventilation in a room using computational fluid dynamics model in order to determine the airflow pattern, draft and pollutant dispersion within the CFD model. The different natural ventilation strategies were studied in cases namely: CASE 1(Single sided ventilation), CASE 2(Cross Ventilation), CASE 3(Bernoulli and Cross Ventilation) and CASE 4(Double single sided ventilation). The CFD simulation was performed with the 3D steady state RANS approach using RNG-KE turbulent model to provide closure. From the result obtained, the author found out that Firstly, CASE 1 and CASE 4 showed a reduce level of air draft (V< 0.2m/s) within the room unlike the CASE 2 and CASE 3 where the air speed on the room occupants most especially at the ankle and head region were much higher than that recommended as per BS EN 7730. Secondly, CASE 2 showed greater efficiency in dealing with pollutant dispersion then followed by CASE 3 and CASE 4 respectively. The concentrations in almost every part of the room for CASE 2 were well within the acceptable range recommended for human occupancy as per BS EN 7730.
Parametric analysis of the wind-driven ventilation potential of buildings with rectangular layout
Building Services Engineering Research and Technology, 2018
A method to evaluate the wind-driven ventilation potential of buildings is proposed and some schematic examples are given. Two indicators of such potential are put forward: the first concerning the pressure difference between spots (openings) on the facades and the second concerning the ratio between this pressure difference and a simplified measure of the pressure loss by the internal air flow. These indicators allow one to compare shapes and orientations and can help finding the most appropriate ones during a preliminary stage of the design of a naturally ventilated building. To present the proposal, a two-dimensional computational fluid dynamics parametric model of a schematic building is set, the parameters of which are the aspect ratio of the building's rectangular plan and the wind relative direction. The computational fluid dynamics simulations are supported by literature benchmarks and by qualitative experiments in a wind tunnel. Using this model, the pressure field is c...