Numerical Analyses for Scale Effect on Wind Pressure of Doubleskin Facades and Its Mechanism

Abstract:

With realizable kε model and nonequilibrium wall functions,the rectangular buildings with Lsection and straightsection DSF(DoubleSkin Facades)were modeled by computational fluid dynamics(CFD)at full scale,1∶10 scale and 1∶100 scale,respectively.The differences of wind pressure coefficient due to the scale of the gap between doubleskin facades in rigid scale model wind tunnel test were studied.The cause of scale effect was explained through the analysis of air flow and flow resistance in the gap of DSF.For Lsection DSF,the gap flow resistance has a great impact on the mean internal pressure when it lies under the wind direction where the airflow in the gap of DSF is strong.Scale effect influences the mean internal pressure by gap flow resistance,that is,the effect increases though the model scale decreases.The gap flow resistance has little effect on the mean internal pressure when the airflow in the gap of Lsection DSF is not strong,and the scale effect on internal pressure is slight.The airflow in the gap of straight DSF is feeble under all wind directions,where the scale effect can be neglected.