Paper 4: Volume 4 No.4 March 2006 Edition
A Comparison of CFD and Full-scale Measurements for
Analysis of Natural Ventilation
T Yang1,
NG Wright1, DW Etheridge2 and AD Quinn3
1School
of Civil Engineering,
University
of
Nottingham
,
University Park
,
Nottingham
,
NG7 2RD
,
UK
2School of the Built Environment,
University
of
Nottingham
,
University Park
,
Nottingham
,
NG7 2RD
,
UK
3School of Engineering,
University
of
Birmingham
, Edgbaston,
Birmingham
,
B15 2TT
,
UK
Abstract
CFD
modelling techniques have been used to simulate the coupled external and
internal flow in a cubic building with two dominant openings.
CFD predictions of the time-averaged cross ventilation flow rates
have been validated against full-scale experimental data under various
weather conditions in
England. RANS
model predictions proved reliable when wind directions were near normal to
the vent openings. However,
when the fluctuating ventilation rate exceeded the mean flow, RANS models
were incapable of predicting the total ventilation rate.
Improved results are expected by applying more sophisticated
turbulence models, such as LES or weighted quasi-steady approximations.
Key
words: natural
ventilation, CFD, envelope flow theory, wind, buoyancy, full-scale
experiment, comparisons.
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