CFD simulation of cross-ventilation using fluctuating pressure boundary conditions.(Report): An article from: ASHRAE Transactions
Book Details
Author(s)L. James Lo, Atila Novoselac
ISBN / ASINB0053NZAPY
ISBN-13978B0053NZAP8
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on January 1, 2011. The length of the article is 4013 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: As much of the world gears toward developing energy efficient and healthy buildings, natural ventilation is becoming an important aspect of building design. While ventilation driven by the stack effect is relatively simple to predict for many different building geometries, the prediction of wind-driven natural ventilation is far more complex due to ever-changing wind speed and direction. Currently, building designs utilizing wind-driven ventilation can only rely on roughly estimated airflow behaviors. In this study, we used full-scale experimental data and computational fluid dynamics (CFD) with the two equation turbulence model (k-[epsilon] RNG) and fluctuating pressure boundary conditions to determine the accuracy of this standard turbulence model in analyses of cross-ventilation airflow. Experimental data for wind induced airflow was obtained by consistently measuring airflow characteristics inside and outside of a test house. The measured facade pressures were then used as the unsteady boundary conditions for the indoor CFD airflow model. The CFD results were then compared with the experimental data to determine whether the prediction was accurate. The preliminary finding of this study suggests that even with unsteady winds, time-varying pressure boundary conditions can be used to model and predict complex wind driven indoor airflow characteristics using CFD. This method can be helpful to engineers in assessing potential for natural ventilation as well as in designing an appropriate system for a proposed building.
Citation Details
Title: CFD simulation of cross-ventilation using fluctuating pressure boundary conditions.(Report)
Author: L. James Lo
Publication:ASHRAE Transactions (Magazine/Journal)
Date: January 1, 2011
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 117 Issue: 1 Page: 621(8)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: As much of the world gears toward developing energy efficient and healthy buildings, natural ventilation is becoming an important aspect of building design. While ventilation driven by the stack effect is relatively simple to predict for many different building geometries, the prediction of wind-driven natural ventilation is far more complex due to ever-changing wind speed and direction. Currently, building designs utilizing wind-driven ventilation can only rely on roughly estimated airflow behaviors. In this study, we used full-scale experimental data and computational fluid dynamics (CFD) with the two equation turbulence model (k-[epsilon] RNG) and fluctuating pressure boundary conditions to determine the accuracy of this standard turbulence model in analyses of cross-ventilation airflow. Experimental data for wind induced airflow was obtained by consistently measuring airflow characteristics inside and outside of a test house. The measured facade pressures were then used as the unsteady boundary conditions for the indoor CFD airflow model. The CFD results were then compared with the experimental data to determine whether the prediction was accurate. The preliminary finding of this study suggests that even with unsteady winds, time-varying pressure boundary conditions can be used to model and predict complex wind driven indoor airflow characteristics using CFD. This method can be helpful to engineers in assessing potential for natural ventilation as well as in designing an appropriate system for a proposed building.
Citation Details
Title: CFD simulation of cross-ventilation using fluctuating pressure boundary conditions.(Report)
Author: L. James Lo
Publication:ASHRAE Transactions (Magazine/Journal)
Date: January 1, 2011
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 117 Issue: 1 Page: 621(8)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
