A study on aerodynamic sound generated from 2D rectangular cylinder

- Examination of separation and reattachment flow pattern -

Abstract

An increasing number of high-rise buildings are being constructed with unique designs and/or with various facings or components, to improve the quality of life style. This has created the problem of aerodynamic wind noise around buildings, and this problem needs to be addressed. Aerodynamic wind noise occurs at many parts such as rooftop louver sets, veranda frames, etc. Several causes of aerodynamic-noise phenomena have been proposed. This paper considers the cases of vortex sound, called Eolian tones, from respective rectangular frames. This occurs under both separated flow and reattachment flow conditions, and creates a large sound pressure level. Therefore, we first examined the characteristics of pressure on the surface of a rectangular model and the sound condition under a laminar wind tunnel flow. Next, we verified the propriety of Curle’s prediction method for predicting vortex sound from wind force information. Finally, we checked the applicability of Howe’s prediction method for predicting vortex sound from vortices simulated by CFD.