Adaptive Perfectly Matched Layer Method for Exterior Acoustics

Exterior acoustics is the modeling of sound propagation in the unbounded domain. Adaptive Perfectly Matched Layer (APML) is an important method to modeling these domains. APML is supported for Direct and Modal Frequency Response Analysis.



Figure 1. Acoustic problem on an infinite domain
The APML method has excellent accuracy similar to the Infinite Elements (IE) method, while it typically exhibits improved performance due to frequency banding.
Adaptive Perfectly Matched Layer (APML) mesh at the outer boundary of the acoustic domain ensures the following conditions are satisfied:
  • Acoustic waves at the interface do not get reflected.
  • Waves which pass through this layer are attenuated.

Supported Solutions

Adaptive Perfectly Matched Layer (APML) method for solutions is supported for:
  • Direct Frequency Response Analysis
  • Modal Frequency Response Analysis
  • SMP runs
  • DDM runs