*HEADING
STANDARD:GLOBAL MODEL
ACOUSTIC TO STRUCTURE SUBMODELING [C3D20/AC3D20]
ACOUSTIC PRESSURE APPLIED ON ONE SIDE OF THE SOLID;
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*PARAMETER
f=15
T1=1.0/f
T01=0.1*T1
omega=2*3.14159*f
*NODE, NSET=BACK_S
 1,  0.0, 0.0, 1.0
 3,  0.0, 0.0, 0.0
 7,  0.0, 1.0, 0.0
 5,  0.0, 1.0, 1.0
1010,0.0, 0.0, 0.5
1100,0.0, 1.0, 0.5
2031,0.0, 0.0, 0.75
2032,0.0, 0.0, 0.25
2039,0.0, 0.5, 1.0
2040,0.0, 0.5, 0.5
2041,0.0, 0.5, 0.0
2052,0.0, 1.0, 0.75
2053,0.0, 1.0, 0.25
*NODE, NSET=BACKMID_S
2028,0.5, 0.0, 1.0
2029,0.5, 0.0, 0.5
2030,0.5, 0.0, 0.0
2049,0.5, 1.0, 1.0
2050,0.5, 1.0, 0.5
2051,0.5, 1.0, 0.0
*NODE, NSET=FRONT_S
 2, 2.0, 0.0, 1.0
 4, 2.0, 0.0, 0.0
 8, 2.0, 1.0, 0.0
 6, 2.0, 1.0, 1.0
1030,2.0, 0.0, 0.5
1300,2.0, 1.0, 0.5
2021,2.0, 0.0, 0.75
2022,2.0, 0.0, 0.25
2033,2.0, 0.5, 1.0
2034,2.0, 0.5, 0.5
2035,2.0, 0.5, 0.0
2042,2.0, 1.0, 0.75
2043,2.0, 1.0, 0.25
*NODE, NSET=FRONTMID_S
2023,1.5, 0.0, 1.0
2024,1.5, 0.0, 0.5
2025,1.5, 0.0, 0.0
2044,1.5, 1.0, 1.0
2045,1.5, 1.0, 0.5
2046,1.5, 1.0, 0.0
*NODE, NSET = CENTER_S
 101, 1.0, 0.0, 1.0
 102, 1.0, 0.0, 0.0
 103, 1.0, 1.0, 0.0
 104, 1.0, 1.0, 1.0
1020,1.0, 0.0, 0.5
1200,1.0, 1.0, 0.5
2026,1.0, 0.0, 0.75
2027,1.0, 0.0, 0.25
2036,1.0, 0.5, 1.0
2037,1.0, 0.5, 0.5
2038,1.0, 0.5, 0.0
2047,1.0, 1.0, 0.75
2048,1.0, 1.0, 0.25
*NODE, NSET=BACK_F
 22, 2.0, 0.0, 1.0
 24, 2.0, 0.0, 0.0
 26, 2.0, 1.0, 1.0
 28, 2.0, 1.0, 0.0
1040,2.0, 0.0, 0.5
1400,2.0, 1.0, 0.5
2006,2.0, 0.0, 0.75
2007,2.0, 0.0, 0.25
2011,2.0, 0.5, 1.0
2012,2.0, 0.5, 0.5
2013,2.0, 0.5, 0.0
2019,2.0, 1.0, 0.75
2020,2.0, 1.0, 0.25
*NODE, NSET=MID_F
2003, 2.5, 0.0, 1.0
2004, 2.5, 0.0, 0.5
2005, 2.5, 0.0, 0.0
2016, 2.5, 1.0, 1.0
2017, 2.5, 1.0, 0.5
2018, 2.5, 1.0, 0.0
*NODE, NSET=FRONT_F
 12, 3, 0.0, 1.0
 14, 3, 0.0, 0.0
 16, 3, 1.0, 1.0
 18, 3, 1.0, 0.0
1050,3.0, 0.0, 0.5
1500,3.0, 1.0, 0.5
2001,3.0, 0.0, 0.75
2002,3.0, 0.0, 0.25
2008,3.0, 0.5, 1.0
2009,3.0, 0.5, 0.5
2010,3.0, 0.5, 0.0
2014,3.0, 1.0, 0.75
2015,3.0, 1.0, 0.25
*NSET, NSET=NODE2
FRONT_S,
*NSET, NSET=SOLID
FRONT_S,CENTER_S,BACK_S, FRONTMID_S, BACKMID_S
*NSET, NSET=QA_TEST
NODE2
*NSET,NSET=ACOUS
BACK_F,FRONT_F, MID_F
*ELEMENT, TYPE=C3D20, ELSET=SOLID
1,1,1010,1100,5,101,1020,1200,104,2031,2040,2052,2039,2026,2037,2047,2036,
  2028,2029,2050,2049
2,1010,3,7,1100,1020,102,103,1200,2032,2041,2053,2040,2027,2038,2048,2037,
  2029,2030,2051,2050
3,101,1020,1200,104,2,1030,1300,6,2026,2037,2047,2036,2021,2034,2042,2033,
  2023,2024,2045,2044
4,1020,102,103,1200,1030,4,8,1300,2027,2038,2048,2037,2022,2035,2043,2034,
  2024,2025,2046,2045
*ELEMENT,TYPE=AC3D20, ELSET=FLUID
5, 22,1040,1400,26,12,1050,1500,16,2006,2012,2019,2011,2001,2009,2014,2008,
  2003,2004,2017,2016
6,1040,24,28,1400,1050,14,18,1500,2007,2013,2020,2012,2002,2010,2015,2009,
  2004,2005,2018,2017
*SOLID SECTION, ELSET=SOLID, MATERIAL=ELAS
*MATERIAL, NAME=ELAS
*ELASTIC
207E9,0.3
*DENSITY
7800.0
*****
*SOLID SECTION, ELSET=FLUID, MATERIAL=FLUID
*MATERIAL, NAME=FLUID
*ACOUSTIC MEDIUM
2.25E9
*DENSITY
1000.0
**
*SURFACE,NAME=SOLID
3,S2
4,S2
*SURFACE,NAME=FLUID
5,S1
6,S1
*TIE,NAME=COUPLE
SOLID,FLUID
**
*BOUNDARY
BACK_S,1,3
**
*AMPLITUDE,NAME=SINE,DEF=PERIODIC
1,<omega>,0.0,0.0
0,1,0,0
**
** Step 1
**
*STEP, NLGEOM=YES
*DYNAMIC,DIRECT
0.0001,<T01>
*BOUNDARY, AMP=SINE
FRONT_F,8,,1e10
***********************************
*FILE FORMAT, ZERO INCREMENT
*NODE FILE, NSET=ACOUS, FREQ=1
POR,
*NODE FILE, NSET=SOLID, FREQ=1
U,
***************
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT,NSET=ACOUS
POR,
*NODE OUTPUT,NSET=SOLID
U,
*****************
*OUTPUT,HISTORY, FREQ=1
*NODE OUTPUT,NSET=BACK_F
POR,
*NODE OUTPUT,NSET=NODE2
U1,
*****************QA_TEST***********
*OUTPUT, FIELD, FREQ = 99999
*NODE OUTPUT,NSET=QA_TEST
U,
*END STEP