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Open AccessJournal ArticleDOI

Wind tunnel analysis of flow and dispersion in cross-ventilated isolated buildings: Impact of opening positions

Yoshihide Tominaga, +2 more
- 01 Aug 2016 - 
- Vol. 155, pp 74-88
TLDR
In this paper, a detailed experimental analysis of flow and dispersion by cross-ventilation in five generic isolated single-zone buildings with different opening positions is presented and time histories of the instantaneous concentration in the building are provided.
About: 
This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 2016-08-01 and is currently open access. It has received 75 citations till now. The article focuses on the topics: Flow visualization & Turbulence kinetic energy.

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The fluid mechanics of natural ventilation

Paul Linden
TL;DR: In this paper, two forms of ventilation are discussed: mixing ventilation and displacement ventilation, where the interior is at an approximately uniform temperature and there is strong internal stratification, respectively, and the effects of wind on them are examined.
Journal ArticleDOI

LES over RANS in building simulation for outdoor and indoor applications: A foregone conclusion?

Bert Blocken, +1 more
- 22 Sep 2018 - 
TL;DR: Why RANS is still frequently used and whether this is justified or not is illustrated by examples for five application areas in building simulation: pedestrian-level wind comfort, near-field pollutant dispersion, urban thermal environment, natural ventilation of buildings and indoor airflow.
Journal ArticleDOI

On the accuracy of CFD simulations of cross-ventilation flows for a generic isolated building: Comparison of RANS, LES and experiments

T. van Hooff, +2 more
- 01 Mar 2017 - 
TL;DR: In this article, the authors validate 3D steady Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) of cross-ventilation in a generic isolated enclosure with wind-tunnel measurements.
Journal ArticleDOI

CFD simulation of cross-ventilation in buildings using rooftop wind-catchers: Impact of outlet openings

Hamid Montazeri, +1 more
- 01 Apr 2018 - 
TL;DR: In this paper, the authors investigated the impact of the outlet openings on the ventilation performance of a single-zone isolated building with a wind catcher, based on three ventilation performance indicators: (i) induced airflow rate, (ii) age of air, and (iii) air change efficiency.
Journal ArticleDOI

Cross-ventilation in a generic isolated building equipped with louvers: Wind-tunnel experiments and CFD simulations

Katarina Kosutova, +6 more
- 01 May 2019 - 
TL;DR: In this paper, the authors present wind-tunnel experiments and computational fluid dynamics (CFD) simulations of a cross-ventilated building equipped with louvers, and the experimental results show that the largest velocities occur in a building with openings in the upper part of the facade.
References
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Journal ArticleDOI

AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings

Yoshihide Tominaga, +6 more
- 01 Oct 2008 - 
TL;DR: In this paper, the authors present guidelines for using computational fluid dynamics (CFD) techniques for predicting pedestrian wind environment around buildings in the design stage, based on cross-comparison between CFD predictions, wind tunnel test results and field measurements.
Journal ArticleDOI

Ventilation performance prediction for buildings: A method overview and recent applications

Qingyan Chen, +1 more
- 01 Apr 2009 - 
TL;DR: In this article, the authors present an overview of the tools used to predict ventilation performance in buildings, which includes analytical models, empirical models, small-scale experimental models, full scale experimental model, multizone network models, zonal models, and computational fluid dynamics models.
Journal ArticleDOI

The COST 732 Best Practice Guideline for CFD simulation of flows in the urban environment: a summary

Jörg Franke, +3 more
- 08 Feb 2011 - 
TL;DR: In this article, a summary of the "Best Practice Guideline" (BPG) document produced in the framework of the European COST Action 732 "Quality assurance and improvement of micro-scale meteorological models", available from the site given in the reference section, is presented.
Book

Ventilation of buildings

Hazim B. Awbi
TL;DR: Hazim Awbi's Ventilation of Buildings has become established as the definitive text on the subject and has been thoroughly revised in the 1990s as mentioned in this paper, drawing in the results of considerable new research in the field.
Journal ArticleDOI

The flow around a surface-mounted cube in uniform and turbulent streams

Ian P. Castro, +1 more
- 22 Feb 1977 - 
TL;DR: In this article, an experimental investigation of the flow around surface mounted cubes in both uniform, irrotational and sheared, turbulent flows is described, and comparisons with the somewhat sparse measurements of previous workers are made and the relevance of recent theoretical attempts to describe the flow, as opposed to numerical calculation techniques to predict it, is briefly discussed.
Related Papers (5)

AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings

Yoshihide Tominaga, +6 more
- 01 Oct 2008 - 

CFD simulation of cross-ventilation for a generic isolated building : impact of computational parameters

R Rubina Ramponi, +2 more
- 01 Jul 2012 - 

Natural Ventilation in Buildings: Measurement in a Wind Tunnel and Numerical Simulation with Large Eddy Simulation

Yi Jiang, +4 more
- 01 Feb 2003 - 

50 years of Computational Wind Engineering: Past, present and future

Bert Blocken, +1 more
- 01 Jun 2014 - 

CFD simulation of the atmospheric boundary layer: wall function problems

Bert Blocken, +3 more
- 01 Jan 2007 - 
Frequently Asked Questions (9)
Q1. What are the contributions mentioned in the paper "Wind tunnel analysis of flow and dispersion in cross-ventilated isolated buildings_ impact of opening positions" ?

This paper presents a detailed experimental analysis of flow and dispersion by cross-ventilation in five generic isolated single-zone buildings with different opening positions. Finally, time histories of the instantaneous concentration in the building are provided. The results provide new insights in the flow and dispersion process inside cross-ventilated buildings and can be used to validate Computational Fluid Dynamics ( CFD ) simulations of flow and dispersion by crossventilation and for the subsequent establishment of new CFD best practice guidelines. 

Nevertheless, it should be mentioned that this study has the following limitations, which provide directions for future research: 

A laser beam (λ¼532 nm, 200 mW, Kato Koken Co.) was used as a light source and converted into a laser sheet parallel to the flow direction by using a cylindrical lens. 

The wind speed at building height H (i.e., UH) is 4.3 m/s, yielding a building Reynolds number of about 45,000, under the condition that the reference velocity at the boundary layer height (1.0 m) is 7.1 m/s. 

The combination of flapping jet behavior and Kelvin–Helmholz instability is a main reason why the concentration decays in the entire indoor volume, and not only at the top part of the volume. 

6–10 each provide 16 images of flow visualizations in the vertical centerplane of each of the five configurations, with a time interval of 1 s between consecutive images. 

This is attributed due to the top position of the outlet opening, which increases the overall resistance of the indoor jet flow compared to configuration C. 

Assuming that the color intensity in the vertical center section is linearly proportional to the indoor tracer gas concentration, the percentage of concentration decay for the last figure (p) relative to the first figure leads to the ranking (from best to worst ventilated): E (78%), B (64%), A (62%), C (58%) and D (57%). 

The diameters of the support for the SFP and the sampling tube of the total hydrocarbon analyzer are 6 mm and 1 mm, respectively.