Abstract
An equivalent fluid model based finite-difference time-domain algorithm is proposed to simulate the frequency characteristic of rigid-frame porous material in 2-dimensional sound field. Two study cases are simulated at oblique incidence of sound, and the calculated surface impedance agree well with the theoretical value in broad frequency range. The errors are also discussed when simulating a porous material with shape with the staircase approximation. As an example, sound propagation in a porous material with triangular shape is simulated using the algorithm.
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