Event Title

CEFIT—A Numerical Modeling Tool for Axisymmetric Wave Propagation in Cylindrical Media

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

In the present paper, a new version of the elastodynamic finite integration technique for axisymmetric wave propagation in homogeneous and heterogeneous linear elastic media (CEFIT) is presented. This special variant of a finite difference time domain scheme offers a suitable method to calculate real three-dimensional problems in a two-dimensional staggered grid. The implementation of boundary conditions at inner and outer boundaries of the model is much easier than in standard FD schemes using non-staggered grids. In order to test the accuracy of the numerical CEFIT code, problems for which analytical solutions are available are presented. These solutions involve wave propagation in an elastic plate and plane wave scattering by a spherical obstacle. Other applications of more practical interest are modeling of compressional US transducers and ultrasound generation caused by a thermoelastic laser source.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 1: Elastic Waves and Ultrasonic Techniques

Section

Scattering/Propagation

Pages

95-102

DOI

10.1007/978-1-4615-4791-4_11

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

CEFIT—A Numerical Modeling Tool for Axisymmetric Wave Propagation in Cylindrical Media

Snowbird, UT, USA

In the present paper, a new version of the elastodynamic finite integration technique for axisymmetric wave propagation in homogeneous and heterogeneous linear elastic media (CEFIT) is presented. This special variant of a finite difference time domain scheme offers a suitable method to calculate real three-dimensional problems in a two-dimensional staggered grid. The implementation of boundary conditions at inner and outer boundaries of the model is much easier than in standard FD schemes using non-staggered grids. In order to test the accuracy of the numerical CEFIT code, problems for which analytical solutions are available are presented. These solutions involve wave propagation in an elastic plate and plane wave scattering by a spherical obstacle. Other applications of more practical interest are modeling of compressional US transducers and ultrasound generation caused by a thermoelastic laser source.