AM05-23-015 LEE/NSハイブリッド法による空力音の数値シミュレーション(騒音3,一般講演)

概要

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The aerodynamic sound generated by the unsteady flow around forward-faceing step has been simulated. The unsteady flow field with a separation and a shear layer has been computed by the compressible Navier-Stokes equation, whereas the quasi-steady flow field with sound propagation has been computed by the linearized Euler equations (LEE). The computational domain consists of two regions, one is the unsteady region which computed by N-S equations another is steady region which computed by LEE. The numerical fluxes are calculated by the Godunov's exact Riemann solver. The higher-order space discretization is conducted by the 5th-order WENO method. The flow-field both unsteady and steady are accurately captured by the present method. The sound pressure level was compared with the experimental one, which has shown fairly good agreement. The results clearly show the current method has the potential to predict the aerodynamic sound generated from more complicated flow field.
日本流体力学会の論文
2005-09-05