PMLSIZE,
FREQB, FREQE,
DMIN, DMAX,
THICK, ANGLE,
WAVESPEED
Determines number of PML or IPML layers.
FREQBMinimum operating frequency (no default).
FREQEMaximum operating frequency (defaults to FREQB).
DMINMinimum distance from the radiation source to the PML or IPML interface (no default).
DMAXMaximum distance from the radiation source to the PML or IPML interface (defaults to
DMIN).
THICKThickness of the PML or IPML region (defaults to 0).
ANGLEIncident angle of wave to the PML or IPML interface (defaults to 0).
WAVESPEEDWave speed in PML or IPML medium (defaults to 343.24 m/s).
PMLSIZE determines the number of PML or IPML layers for acceptable numerical accuracy.
PMLSIZE must be issued before any meshing commands. If the thickness of the PML or IPML region is known, it determines an element edge length (h) and issues ESIZE,h. If the thickness of the PML or IPML region is unknown, it determines the number of layers (n) and issues ESIZE,,n.
See Artificially Matched Layers in the Mechanical APDL Acoustic Analysis Guide for more information about using perfectly matched layers (PML) and irregular perfectly matched layers (IPML).