Potential of Room Acoustic Solver with Plane-Wave Enriched Finite Element Method

Takeshi Okuzono, M. Shadi Mohamed, Kimihiro Sakagami

Research output: Contribution to journalArticle

Abstract

Predicting room acoustics using wave-based numerical methods has attracted great attention in recent years. Nevertheless, wave-based predictions are generally computationally expensive for room acoustics simulations because of the large dimensions of architectural spaces, the wide audible frequency ranges, the complex boundary conditions, and inherent error properties of numerical methods. Therefore, development of an efficient wave-based room acoustic solver with smaller computational resources is extremely important for practical applications. This paper describes a preliminary study aimed at that development. We discuss the potential of the Partition of Unity Finite Element Method (PUFEM) as a room acoustic solver through the examination with 2D real-scale room acoustic problems. Low-order finite elements enriched by plane waves propagating in various directions are used herein. We examine the PUFEM performance against a standard FEM via two-room acoustic problems in a single room and a coupled room, respectively, including frequency-dependent complex impedance boundaries of Helmholtz resonator type sound absorbers and porous sound absorbers. Results demonstrated that the PUFEM can predict wideband frequency responses accurately under a single coarse mesh with much fewer degrees of freedom than the standard FEM. The reduction reaches σ(10 -2) at least, suggesting great potential of PUFEM for use as an efficient room acoustic solver.

Original languageEnglish
Article number1969
JournalApplied Sciences
Volume10
Issue number6
DOIs
Publication statusPublished - 13 Mar 2020

Keywords

  • Frequency domain
  • PUFEM
  • Room acoustics
  • Wave-based method

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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