Combined wind tunnel and CFD analysis for indoor airflow prediction of wind-driven cross ventilation

Abstract This study presents a method for predicting wind-induced cross ventilation using wind tunnel testing coupled with Computational Fluid Dynamics (CFD). First, in a boundary layer wind tunnel, facade pressures near openings of a test house were recorded for multiple incident wind angles using a 1:25 scale building model. The wind tunnel pressure data was then converted into appropriate boundary conditions for an indoor CFD airflow model of the test house. Both steady state and transient CFD simulations were conducted to capture averaged flow and instantaneous flow rates of the cross ventilation flow. The CFD simulation result was compared to the full scale experimental data from a previous study. The steady state result shows that it is possible for this combined wind tunnel-CFD method to predict the averaged cross ventilation through small openings adequately. Similarly, the transient result shows the fluctuation of the flow at the openings could be predicted at a frequency as high as 0.1 Hz. As many buildings design processes now include wind tunnel testing as a part of structural analysis, this proposed method could utilize the wind tunnel pressure data for assessments of a building's cross ventilation potential.

[1]  Atila Novoselac,et al.  Predicting building cross ventilation using wind tunnel decay test , 2011 .

[2]  Yin-Hao Chiu,et al.  Turbulence effects on the discharge coefficient and mean flow rate of wind-driven cross-ventilation , 2009 .

[3]  M. Sandberg,et al.  Building Ventilation: Theory and Measurement , 1996 .

[4]  Liang Ji,et al.  WIND TUNNEL INVESTIGATION ON INFLUENCE OF FLUCTUATING WIND DIRECTION ON CROSS NATURAL VENTILATION , 2011 .

[5]  Qingyan Chen,et al.  Ventilation performance prediction for buildings: A method overview and recent applications , 2009 .

[6]  Yu-Wen Wang,et al.  An experimental study of wind-driven cross ventilation in partitioned buildings , 2010 .

[7]  Ryuichiro Yoshie,et al.  CFD modelling of unsteady cross ventilation flows using LES , 2008 .

[8]  Jack E. Cermak,et al.  Wind-tunnel modelling of the atmospheric surface layer , 1995 .

[9]  Dominique Marchio,et al.  Numerical simulation of single-sided ventilation using RANS and LES and comparison with full-scale experiments , 2012 .

[10]  Yuguo Li,et al.  Prediction of natural ventilation in buildings with large openings , 2000 .

[11]  G. Evola,et al.  Computational analysis of wind driven natural ventilation in buildings , 2006 .

[12]  Claude-Alain Roulet,et al.  Natural ventilation for passive cooling: measurement of discharge coefficients , 1998 .

[13]  Tadahisa Katayama,et al.  Full-scale measurements and wind tunnel tests on cross-ventilation , 1992 .

[14]  Danny S. Parker.  Very low energy homes in the United States: Perspectives on performance from measured data , 2009 .

[15]  Shinsuke Kato,et al.  Wind-induced ventilation performances and airflow characteristics in an areaway-attached basement wi , 2011 .

[16]  Takashi Kurabuchi,et al.  Study on airflow characteristics inside and outside a cross-ventilation model, and ventilation flow rates using wind tunnel experiments , 2001 .

[17]  Shinsuke Kato,et al.  Experimental investigations of the indoor natural ventilation for different building configurations and incidences , 2011 .

[18]  Qingyan Chen,et al.  Effect of fluctuating wind direction on cross natural ventilation in buildings from large eddy simulation , 2002 .

[19]  Jlm Jan Hensen,et al.  Uncertainty in airflow rate calculations due to the use of surface-averaged pressure coefficients , 2010 .

[20]  Qingyan Chen,et al.  Validation of CFD Simulations for Natural Ventilation , 2004 .

[21]  W. A. Dalgliesh,et al.  Comparison of model/full-scale wind pressures on a high-rise building , 1975 .

[22]  Jiun-Jih Miau,et al.  Wind driven natural ventilation through multiple windows of a building: A computational approach , 2012 .

[23]  Jack E. Cermak,et al.  Physical-modeling investigations for wind engineering: Applications beyond wind-load determinations , 1990 .

[24]  Atila Novoselac,et al.  CFD simulation of cross-ventilation using fluctuating pressure boundary conditions , 2011 .

[25]  Hans-Jürgen Niemann,et al.  The boundary layer wind tunnel: an experimental tool in building aerodynamics and environmental engineering , 1993 .

[26]  Qingyan Chen,et al.  Natural Ventilation in Buildings: Measurement in a Wind Tunnel and Numerical Simulation with Large Eddy Simulation , 2003 .

[27]  Shuzo Murakami,et al.  Chained analysis of wind tunnel test and CFD on cross ventilation of large-scale market building , 1997 .

[28]  Atila Novoselac,et al.  Cross ventilation with small openings: Measurements in a multi-zone test building , 2012 .

[29]  Bje Bert Blocken,et al.  CFD simulation of cross-ventilation for a generic isolated building : impact of computational parameters , 2012 .

[30]  Markus Rösler,et al.  Calculation of wind-driven cross ventilation in buildings with large openings , 2006 .