Nonlinear parametric sound enhancement through different fluid layer and its application to noninvasive measurement

Thin and sharp edges bodies-fluid interaction simulation using cut-cell immersed boundary method

“…In cases involving thin objects, the intricacies are difficult to capture, which leads to an inadequate understanding of the nature of the relationship between a solid and a surrounding fluid (Liang, Wei, Lu, & Qin, 2017;Mo, Lien, Zhang, & Cronin, 2018;Mou, He, Zhao, & Chau, In FSI problems, the flow characteristics within proximity of the surface of thin objects are determined by estimating the pressure and velocities of the flow in the boundary layer. Re-meshing is required whenever the thin object becomes displaced or deformed, which will increase the computational cost (Bourlet, Gurugubelli, & Jaiman, 2015;Fujisawa & Asada, 2016;Liu, Zhao, Hu, Goman, & Li, 2013;Yang, Yu, Krane, & Zhang, 2018). In this regard, fixed Cartesian mesh schemes are typically implemented for the discretization of the equations of fluid dynamics in order to estimate the flow characteristics of arbitrarily thin objects because of their simplicity and lower computational cost.…”

Numerical and Experimental Studies on Inclined Incidence Parametric Sound Propagation

“…For the problem of parametric sound transmission in near-field, finite-difference frequency-domain method (FDFD) and finite-difference time-domain method (FDTD) were proposed to calculate parametric sound propagation [11][12][13][14]. Several numerical and experimental results for the parametric sound field propagation characteristics based on circular parametric array were found [15][16][17][18]. However, most of the parametric array equipment used in underwater acoustics detection area is rectangular due to production process conditions.…”