Time domain numerical modelling of guided wave excitation in fluid-filled pipes

Research output: Contribution to journalArticlepeer-review

13 Downloads (Pure)

Abstract

Acoustic waves have been widely used to inspect pipeline defects, including leakage, blockage and corrosion etc. The time-domain excitation of guided waves in the fluid/solid coupled pipeline system has rarely been studied theoretically. This requires the incorporation of a source term in the coupled system. This article introduces a finite element based numerical model to study the excitation of guided waves in the coupled system with a sound source either in the fluid or on the pipe wall. A compatible pair of time-domain Perfectly Matched Layers (PMLs) have been proposed to absorb pipe end reflections in the elastic wall and in the fluid respectively. These fluid/solid PML numerical formulations are coupled and the implementation of the coupling is introduced. The numerical model is validated against an enlarged model without PML, and excellent agreement has been achieved. The numerical model shows that the dominant excited wave mode is a fluid type wave mode when the sound source is a fluid source or a radial elastic line source. However, the dominant excited wave mode is a structure type wave mode when the sound source is an axial elastic line source.
Original languageEnglish
Article number103813
Number of pages17
JournalFinite Elements in Analysis and Design
Volume210
Early online date8 Aug 2022
DOIs
Publication statusPublished - 1 Nov 2022

Keywords

  • Excitation of guided waves
  • Fluid/solid coupling
  • Time domain PMLs

Fingerprint

Dive into the research topics of 'Time domain numerical modelling of guided wave excitation in fluid-filled pipes'. Together they form a unique fingerprint.

Cite this