Applications of Three-Dimensional Large-Eddy Simulations on Indoor Airflow Field of Multi-Room Buildings
Date Issued
2004
Date
2004
Author(s)
Hsieh, Yi-Fang
DOI
zh-TW
Abstract
The main objective of this study is to develop a 3-D turbulent flow model for indoor multi-room environment. The 3-D turbulent flow model of an indoor multi-room building in this study can provide not only mean flow field but also instantaneous flow field. The results enable us to understand indoor turbulence which cannot be given by the mean flow field. We select the finite volume method to discretize the governing equations of our model. SIMPLE scheme is used to adjust flow field to satisfy the continuity equation. Large eddy simulation(LES) with subgrid-scale stress model(SGS) is adopted to model the turbulence flow field in the study.
The numerical model is firstly verified by the reliable experimental measurement. The numerical results are in good agreement with the experimental data. In our case study, a common multi-room style in Taiwan region has been selected to simulate the flow patterns for various ventilation strategies in multi-room buildings. Seven kinds of ventilation strategies are simulated, including full-open ventilation, side ventilation, pass-through (piston) ventilation, cross ventilation(typeⅠand typeⅡ) and short-cut ventilation(typeⅠand typeⅡ). It is found out that pass-through ventilation can provide the most effective way in the downward-side rooms. The openness of windows in the room is the key point of ventilation efficiency. In addition, shelterbelts (porous media) situated in front of windows are used to reduce wind speed. The flow patterns changed by shelterbelts are discussed. Results show that shelterbelts can decrease indoor air speeds effectively up to 25%.
Subjects
計算流體力學
多區間建築物環境風場
有限體積法
綠植栽(孔隙介質)
大渦模擬紊流模式
shelterbelts (porous media)
Computational fluid dynamics
multi-room building environmental flow field
large eddy simulation
finite volume method
Type
thesis
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