A sonic black hole of a rectangular cross-section

被引：14

作者：

Bednarik, M. ^{[1
]}

Cervenka, M. ^{[1
]}

机构：

[1] Czech Tech Univ, Fac Elect Engn, Tech 2, Prague 6, Czech Republic

来源：

APPLIED MATHEMATICAL MODELLING | 2024年 / 125卷

关键词：

Rectangular sonic black hole; Confluent Heun equation; Confluent Heun function; Riccati equation; Wave splitting method; PROPAGATION;

D O I：

10.1016/j.apm.2023.09.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, a rectangular cross-section sonic black hole (SBH) is explored and a one-dimensional model equation for the acoustic field inside it is presented. The model equation's applicability is verified through a comparison with the corresponding two-dimensional Helmholtz equation. A general analytical solution, which takes into account the SBH's quadratically varying internal cross-section, is derived using linearly independent confluent Heun functions. To investigate the acoustic wave behavior in the SBH, the wave splitting method is utilized to obtain forward and backward acoustic pressure waves, and the reflection coefficient is calculated. To confirm the validity of the analytical solution, a comparison is made with numerical results obtained from the Riccati equation. Within the context of this study, a detailed discussion is provided regarding the applicability of the analytical solution.

引用

页码：529 / 543

页数：15

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