線形オイラー法を用いた回転体周りの空力音解析

抄録

In order to solve aerodynamic sound radiated from the rotating bodies, including the acoustic interference of a moving object, we attempted to develop the time domain method for acoustic simulation based on a linearized Euler equation. Since pressure fluctuations of the sound wave are smaller than hydrodynamic pressure fluctuations, higher order simulation is required. In our estimation, the conventional wave simulations which have usually the second order accuracy are not enough to obtain sufficient accuracy. In addition, it is difficult to simulate the interfare flow field and acoustic fields. To break this problems, We utilized a Linearized Euler Equation method with compact scheme of 6th order accuracy of space domain and 3rd order accuracy of time domain to solve aerodynamic sound. We also developed an immersed boundary method to simulate complex-geometry and moving objects. The numerical results showed that the higher order LEE with immersed boundary method is suitable method to simulate acoustic field of rotating objects.