*Heading
STANDARD-TO-EXPLICIT IMPORT
*PREPRINT, MODEL=YES, HISTORY=YES
*IMPORT, STATE=YES, UPDATE=NO
SOLID,FLUID
*PARAMETER
f=15
omega=2*3.14159*f
*AMPLITUDE,NAME=SINE,DEF=PERIODIC
1,<omega>,-0.005,0.0
0,1,0,0
*SURFACE,NAME=SOLID
2,S2
*SURFACE,NAME=FLUID
3,S4
*TIE,NAME=COUPLE
SOLID,FLUID
*NSET, NSET=BACK_S
1,7
*ACOUSTIC WAVE FORMULATION, TYPE=SCATTERED
*BOUNDARY
BACK_S,1,2
*STEP
***FREQUENCY,EIGENSOLVER=LANCZOS, ACOUSTIC COUPLING=ON
**4
*FREQUENCY,EIGENSOLVER=LANCZOS, ACOUSTIC COUPLING=ON
4
*BOUNDARY
BACK_S,1,2
*END STEP