*HEADING
STANDARD:SUBMODEL from ac2solid_g_c3d20_ac3d20_std
ACOUSTIC TO STRUCTURE SUBMODELING [C3D20/AC3D20]
ACOUSTIC PRESSURE DRIVES ON ONE SIDE OF THE STRUCT.;
DISPLACEMENT DRIVES THE OTHER SIDE OF THE STRUCT.;
*PARAMETER
f=15
T1=1.0/f
T01=0.1*T1
*PREPRINT,echo=yes,model=yes, history=yes
*NODE, NSET=FRONT_S
 1, 2.0, 0.0, 1.0
 2, 2.0, 0.0, 0.5
 3, 2.0, 0.0, 0.0
 6, 2.0, 1.0, 0.0
 5, 2.0, 1.0, 0.5
 4, 2.0, 1.0, 1.0
2001,2.0,0.0,0.75
2002,2.0,0.0,0.25
2013,2.0,0.5,1.0
2014,2.0,0.5,0.5
2015,2.0,0.5,0.0
2022,2.0,1.0,0.75
2023,2.0,1.0,0.25
*NODE, NSET=FRONTMID_S
2003,1.75,0.0,1.0
2004,1.75,0.0,0.5
2005,1.75,0.0,0.0
2024,1.75,1.0,1.0
2025,1.75,1.0,0.5
2026,1.75,1.0,0.0
*NODE, NSET = CENTER_S
 7, 1.50, 0.0, 1.0
 8, 1.50, 0.0, 0.5
 9, 1.50, 0.0, 0.0
 12, 1.50, 1.0, 0.0
 11, 1.50, 1.0, 0.5
 10, 1.50, 1.0, 1.0
2006,1.50, 0.0, 0.75
2007,1.50, 0.0, 0.25
2016,1.50, 0.5, 1.0
2017,1.50, 0.5, 0.5
2018,1.50, 0.5, 0.0
2027,1.50, 1.0, 0.75
2028,1.50, 1.0, 0.25
*NODE, NSET = Back_S
 13, 1.0, 0.0, 1.0
 14, 1.0, 0.0, 0.5
 15, 1.0, 0.0, 0.0
 18, 1.0, 1.0, 0.0
 17, 1.0, 1.0, 0.5
 16, 1.0, 1.0, 1.0
2011, 1.0, 0.0, 0.75
2012, 1.0, 0.0, 0.25
2019, 1.0, 0.5, 1.0
2020, 1.0, 0.5, 0.5
2021, 1.0, 0.5, 0.0
2032, 1.0, 1.0, 0.75
2033, 1.0, 1.0, 0.25
*NODE, NSET=BACKMID_S
2008, 1.25, 0.0, 1.0
2009, 1.25, 0.0, 0.5
2010, 1.25, 0.0, 0.0
2029, 1.25, 1.0, 1.0
2030, 1.25, 1.0, 0.5
2031, 1.25, 1.0, 0.0
*NSET,NSET=QA_TEST
CENTER_S,
*ELEMENT, TYPE=C3D20, ELSET=SOLID
1,1,2,8,7, 4,5,11,10,2001,2004,2006,2003,2022,2025,2027,2024,
  2013,2014,2017,2016
2,2,3,9,8,5,6,12,11,2002,2005,2007,2004,2023,2026,2028,2025,
  2014,2015,2018,2017
3,7,8,14,13,10,11,17,16,2006,2009,2011,2008,2027,2030,2032,2029,
  2016,2017,2020,2019
4,8,9,15,14,11,12,18,17,2007,2010,2012,2009,2028,2031,2033,2030,
  2017,2018,2021,2020
*SOLID SECTION, ELSET=SOLID, MATERIAL=ELAS
*MATERIAL, NAME=ELAS
*ELASTIC
207E9,0.3
*DENSITY
7800,
**
*SURFACE,NAME=SOLID
1,S3
** 2,s3
*SURFACE, NAME=SOLID1
2,s3
*submodel, acoustic to structure,EXTERIOR=0.1
SOLID,
*submodel, acoustic to structure,EXTERIOR=0.1
SOLID1,
*SUBMODEL,EXTERIOR=0.1
BACK_S,
**
*STEP, NLGEOM=YES
*DYNAMIC,DIRECT
0.0001,<T01>
*BOUNDARY, SUBMODEL, step=1
FRONT_S,8,8
BACK_S,1,3
*****
*OUTPUT,FIELD,FREQ=10
*NODE OUTPUT
U,
*ELEMENT OUTPUT
S,
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=FRONT_S
U1,
*****************QA_TEST***********
*OUTPUT, FIELD, FREQ = 99999
*NODE OUTPUT,NSET=QA_TEST
U,
*END STEP