CASE STUDY ON RELATIONSHIP BETWEEN FALLING WATER SOUND AND TURBLENT ENERGY DISSIPATION RATE ON WATER-CUSHIN-TYPE DROP

Abstract

 In consequence of progress of urbanization or mixed settlement in the rural area, falling water sound on drops has been recognized as a noise by people who came to reside newly around there. Therefore, this study conducted the comparison of relationship between sound power level calculated from sound pressure level measured on site and turbulent energy dissipation rate simulated by CFD, for the purpose of predicting the falling water sound on water-cushion-type drop. The results showed that turbulent energy dissipation rate had higher correlation with sound power level than water flow energy per unit time and unit width focused on in previous studies, and that turbulent energy dissipation rate had possibility to predict the effect of discharge or head drop on sound power level.