直接計算による角柱から生じる空力音のLighthill音源項に関する研究

概要

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Aerodynamic sound radiate from a flow around has been numerically predicted by two methods. The first one is DNS which solve the compressible Navier-Stokes equations directly, and the second one is based on Lighthill Tensor which is the right side of Lighthills equation. Recently, analyzing Lighthill Tensor is more used because of high cost of DNS. However, this method still has several problems especially about the termination of the computational domain. To solve computational domain problem, we use DNS in this study. The sound field radiated from the two-dimensional square cylinder in a uniform flow is computed by change the number of vortices captured by the computation. In order to clarify vortices radiating sound, we investigate sound mechanism. In addition, we calculate Powells and Lighthills acoustic sound sources.[This abstract is not included in the PDF]