Significance of establishing pressure coefficients for wind catchers/towers natural ventilation systems

Pressure coefficients are considered vital components for the calculation of airflow through opening in building.The experimental investigation consisted of a square wind catcher connected to a model test room. At various wind speeds and four different wind directions between 0-45 at interval of 15, the pressure coefficients distribution, the internal air speed and the volumetric airflow were measured.The results obtained using Explicit, AIDA Implicit model and CFX code appeared in adequacy with the experimental results at lower speeds and with wind incidents at angle of 0-15 .