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VGU RESEARCH REPOSITORY


Please use this identifier to cite or link to this item: https://epub.vgu.edu.vn/handle/dlibvgu/743
Title: CFD simulations of natural ventilation in residential housing.
Authors: Do Dai Van 
Keywords: Natural ventilation;Renewable energy;Computational fluid dynamics;Buoyancy driven
Issue Date: 2019
Publisher: Vietnamese - German University
Abstract: 
Natural ventilation is always an attractive topic in civil engineering. It helps people take advantage of the natural and renewable energy resources — wind and buoyancy that leads to considerably reduce CO2 released to the air due to using electricity for cooling houses, especially enormous buildings. Nowadays with the development of super-computers, scientists have been applying theory of Computational Fluid Dynamics (CFD) in calculation and simulation fields in order to reduce the cost in real life. For instance, we can predict the performance of ventilation in a virtual environment in advance physical testing. Therefore, an accurate CFD simulation of combined internal and external flows is now essential for the design and evaluation of natural cross-ventilation strategies for building for various reasons. The main purpose of this work is to investigate the performance of Ansys Fluent and OpenFOAM in terms of accuracy and computational cost for simulations of natural ventilation inside houses, driven by atmospheric wind (wind driven) and/or internal temperature difference (buoyancy driven). This thesis consists of two stages:
• In the first stage, we construct a general procedure for CFD simulations of Atmospheric Boundary Layer flow over and through an isolated house in Fluent and OpenFOAM. The results will then be compared to the previously published simulation and experimental data in 2012 [16]. In the process of generation the geometry and the computational domain, the module ANSYS ICEM is employed to create meshes with ".msh" format that can be used in fluent. The outcome are structured meshes with different numbers of control volumes and mesh sizes. Furthermore, this kind of format is compatible with OpenFOAM software. By using "fluentMeshtoFoam" command, we can easily convert ".msh" format to another format in order to calculate in OpenFOAM. • In the second stage, CFD simulations are performed to investigate the natural ventilation for a typical residential tube house, driven by buoyancy effect due to internal temperature differences. In the multi-story buildings, buoyancy-driven systems with shafts are used to cater pathway for air to rise through the building. iThese systems can greatly reduce energy for cooling and ventilating process due to using non-mechanical forces. In all simulations, the flows are steady incompressible turbulent, governed by the Reynolds-averaged Navier—Stokes system.
URI(1): http://epub.vgu.edu.vn/handle/dlibvgu/743
Rights: Attribution-NonCommercial 4.0 International
Appears in Collections:Computational Engineering (CompEng)

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