On the Analysis and Construction of Perfectly Matched Layers for the Linearized Euler Equations

✍ Scribed by J.S. Hesthaven

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 257 KB
• Volume: 142
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1006/jcph.1998.5938

✦ Synopsis

We present a detailed analysis of a recently proposed perfectly matched layer (PML) method for the absorption of acoustic waves. The split set of equations is shown to be only weakly well-posed, and ill-posed under small low order perturbations. This analysis provides the explanation for the stability problems associated with the spilt field formulation and illustrates why applying a filter has a stabilizing effect. Utilizing recent results obtained within the context of electromagnetics, we develop strongly well-posed absorbing layers for the linearized Euler equations. The schemes are shown to be perfectly absorbing independent of frequency and angle of incidence of the wave in the case of a non-convecting mean flow. In the general case of a convecting mean flow, a number of techniques is combined to obtain absorbing layers exhibiting PML-like behavior. The efficacy of the absorbing layers is illustrated though the solution of aero-acoustic benchmark problems.