INVESTIGATION ON APPLICABILITY OF LOCAL DYNAMIC SIMILARITY MODEL FOR INFLOW OPENINGS : Prediction accuracy of flow rate of cross-ventilated buildings (Part 2)

Abstract

The previous paper confirmed that the local dynamic similarity model can predict discharge coefficients, which vary with wind direction and opening position, if some requirements are met. Four types of wind tunnel experiments were carried out in this study to investigate how strictly these requirements have to be met when the model is applied to inflow openings. If was thus found that the model should not be applied when the opening is in a flow separation region, because it does not consider the effect on the discharge coefficient of recalculating flow generated by flow separation. It was also found that the effects of the direction of flow tangential to the opening, the profile of this flow over the opening and a wall hindering the diffusion of incoming air flow near the opening were generally small or negligible. Thus, there are no substantial problems in applying the model when the direction or profile of the tangential flow is changed or when there is a wall near the opening.