*HEADING
MODE 0 SPHERE, USING PLANE WAVE ABSORBING CONDITION AND ACAX8 ELEMENTS
*NODE,NSET=INNER
*NODE,NSET=MID
*NODE,NSET=OUTER
*ELEMENT, TYPE=ACAX8,ELSET=EALL
*ELGEN, ELSET=EALL
*ELEMENT,TYPE=ASI3A,ELSET=COUPLING
*ELGEN,ELSET=COUPLING
**
** FLUID MATERIAL PROPERTIES; ARTIFICIAL MEDIUM FOR CONVENIENCE
** USING RHO = 1, BULKMOD = (2*PI)^2, WE HAVE C = 2*PI AND K = F.
**
*MATERIAL,NAME=AETHER
*DENSITY
1.000000,
*ACOUSTIC MEDIUM,BULK MODULUS
*SOLID SECTION,MATERIAL=AETHER,ELSET=EALL
*INTERFACE,ELSET=COUPLING
**
*NSET,NSET=RECRD
*TRANSFORM,NSET=INNER,TYPE=C
*STEP
*STEADY STATE DYNAMIC,DIRECT
*IMPEDANCE
EALL, I3
**
** SURFACE RADIAL ACCELERATION OF 1/(RHO C) MAGNITUDE
**
*BOUNDARY,TYPE=VELOCITY
INNER,1,1,0.159154943
INNER,2,2,0.0
*NODE PRINT,NSET=RECRD
POR,PPOR
*NODE FILE
POR,PPOR
*OUTPUT,FIELD
*NODE OUTPUT
POR,
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=RECRD
POR,
*END STEP