Abstract
It is necessary to reduce the aerodynamic sound generated by fans since they are often used for air-conditioner, which are placed in human living areas, such as homes and offices. To reduce the aerodynamic sound, we focused on the Helmholtz resonator (HR). Toward developing HR that can be installed into air-conditioners and reduce aerodynamic sound, the present study investigated a numerical analysis method and the effect of cavity shapes on the sound reduction performance of HR using a simple computational model. As a numerical analysis method, we used the lattice Boltzmann method (LBM), which can simultaneously simulate aerodynamically sound generation in fans and the acoustic resonance in resonators. First, the capability of the LBM to simulate acoustic resonance was validated. As a result, it was shown that the calculation results were consistent with the theoretical equation. Furthermore, the present study revealed the relationship between the depth of the resonator cavity and the sound reduction effect.
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