Numerical Analysis of Sound Wave Propagation Using CIP-MOC Method with Non-Uniform Grid

In recent years, time-domain numerical analysis for sound wave propagation has been investigated widely as a result of advances in computer technology. For sound field imaging and/or prediction, the development of accurate numerical schemes is an important issue. A method of characteristics (MOC) is used as a time domain numerical analysis method, examples of which are the constrained interpolation profile (CIP) method, the LAX method, and the QUICKEST method. We used the MOCs for numerical analyses of sound wave propagation in an earlier study. However, new grid systems are required for the CIP large-scale simulations of wave propagation. Additionally, for multidimensional analysis, the high-efficiency outer absorbing boundary is also required. To overcome these problems, we introduce the non-uniform grid system with perfectly matched layer (PML) technique. The purpose of this study is to evaluate these techniques for two-dimensional (2D) sound field numerical analysis using the MOCs. The present results indicate that these techniques for MOCs have advantages of small memory requirements and less calculation time.