*HEADING
 1D transient wave propagation,structure- acoustic coupling 
 (between AC3D8 and C3D8 elements), 
 incident wave load, spherical and defined through bubble-load amplitude
**
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=YES
*NODE, NSET=ACOUSTIC
 1, 0, 0, 0
 2, 1, 0, 0
 3, 1, 1, 0
 4, 0, 1, 0
 5, 0, 0, 1
 6, 1, 0, 1
 7, 1, 1, 1
 8, 0, 1, 1
*NODE,NSET=SOLID
 1001, 1, 0, 0
 1002, 2, 0, 0
 1003, 2, 1, 0
 1004, 1, 1, 0
 1005, 1, 0, 1
 1006, 2, 0, 1
 1007, 2, 1, 1
 1008, 1, 1, 1
*ELEMENT,TYPE=AC3D8,ELSET=ACOUSTIC
 1, 1,2,3,4,5,6,7,8
*ELEMENT,TYPE=C3D8,ELSET=SOLID
 1001, 1001,1002,1003,1004,1005,1006,1007,1008
**************************
*SURFACE,NAME=IW_LOAD_ACOUSTIC
1,S4
*SURFACE,NAME=IW_LOAD_SOLID
1001,S6
*SURFACE,NAME=TIE_ACOUSTIC
1,S4
*SURFACE,NAME=TIE_SOLID
1001,S6
**************************
*SOLID SECTION,MATERIAL=WATER,ELSET=ACOUSTIC
**
*MATERIAL,NAME=WATER
*DENSITY
 1.0E3,
*ACOUSTIC MEDIUM,BULK MODULUS
 2.25E9,
**
*SOLID SECTION,MATERIAL=SOLID,ELSET=SOLID
**
*MATERIAL,NAME=SOLID
*DENSITY
 1.E3,
*ELASTIC
 1.E6,0.0
**
**************************
*INCIDENT WAVE PROPERTY,NAME=IWPROP,TYPE=SPHERE
1.0,0.5,0.5
-10.0E04,0.5,0.5
*INCIDENT WAVE FLUID PROPERTY
2.25E9,1.0E3,0.0
*AMPLITUDE,DEFINITION=BUBBLE,NAME=BUBBLE-LOAD
52.1E6, 0.09E-3, 0.18, 0.185, 839.6E6, 1.27, 1.5E3, 226.8, 37.16
1.0E3, 1.5E3, 1.0, 0.0, 0.0
9.8E0, 9.8E4,0.0
2.5,1500,1e-12,1e-12,0.2
**************************
**
*BOUNDARY
SOLID,ENCASTRE
**************************
**
*TIE,NAME=COUPLING
TIE_ACOUSTIC,TIE_SOLID
**************************
*RESTART,WRITE,FREQUENCY=1000
**
*STEP,INC=10000
*DYNAMIC,ALPHA=0.0
.0005,.5
**
*IMPEDANCE
 1,I6
**
*INCIDENT WAVE,PRESSUREAMPLITUDE=BUBBLE-LOAD,PROPERTY=IWPROP
IW_LOAD_ACOUSTIC,1.0
IW_LOAD_SOLID,1.0
**
*NODE PRINT,NSET=ACOUSTIC,FREQ=1000
 POR,
*NODE PRINT,NSET=SOLID,FREQ=1000
 RF,
*OUTPUT,FIELD,VAR=PRESELECT
*OUTPUT,FIELD,FREQ=1000
*NODE OUTPUT,NSET=ACOUSTIC
 POR,
*NODE OUTPUT,NSET=SOLID
 RF,
*OUTPUT,HISTORY,FREQ=20
*NODE OUTPUT,NSET=ACOUSTIC
 POR,
*NODE OUTPUT,NSET=SOLID
 RF,
*ENDSTEP