*HEADING
: MODEL CHANGE ACOUSTICS TESTS  [AC3D15]
*PREPRINT,ECHO=YES,MODEL=YES,HISTORY=YES
*NODE, Nset=ODB_NSET
1, 
41,,10.
1001,1.
1041,1.,10.
2001,,,1.
2041,,10.,1.
3001,1.,,1.
3041,1.,10.,1.
4001,,,.5
4041,,10.,.5
5001,1.,,.5
5041,1.,10.,.5
6001,0.5,,0.5
6041,0.5,10,0.5
*NGEN,NSET=NALL1
1,41
2001,2041
*NGEN,NSET=NALL2
1001,1041
3001,3041
*NFILL,NSET=ALL_NODES
NALL1,NALL2,2,500
*NGEN,NSET=NALL3
4001,4041
5001,5041
6001,6041
*ELEMENT,TYPE=AC3D15,ELSET=ALL_ELEMENTS
    1,    1, 2001, 1001,    5, 2005, 1005,
         4001, 6001,  501, 4005, 6005,  505,
            3, 2003, 1003,
    2, 1001, 2001, 3001, 1005, 2005, 3005,
         6001, 2501, 5001, 6005, 2505, 5005,
         1003, 2003, 3003,
*ELGEN,ELSET=ALL_ELEMENTS
1,10,4,2
2,10,4,2
*ELSET,ELSET=SECOND,GENERATE
11,20
*MATERIAL,NAME=AIR
*DENSITY
1.293, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176E5, 
*SOLID SECTION,MATERIAL=AIR,ELSET=ALL_ELEMENTS
*NSET,NSET=RECRD,GEN
1,21
*NSET,NSET=DRIV
1,1001,2001,3001
**************************************
*Elset,Elset=ODB_ESET
SECOND, ALL_ELEMENTS
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, ALL_NODES, RECRD, DRIV
**
**
*STEP
*STEADY STATE DYNAMIC,DIRECT
1., 
*IMPEDANCE
19,I1,
20,I1,
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=RECRD
POR,PPOR
*NODE FILE,NSET=RECRD
POR,PPOR
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*OUTPUT,HISTORY,OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*ENDSTEP
**************************************
*STEP
*STATIC
1,1
*MODEL CHANGE,REMOVE
SECOND,
*ENDSTEP
**************************************
*STEP
*STEADY STATE DYNAMIC,DIRECT
1., 
*IMPEDANCE,OP=NEW
9,I1,
10,I1,
*BOUNDARY
DRIV,8,,1.
*NODE PRINT,NSET=RECRD
POR,PPOR
*NODE FILE,NSET=RECRD
POR,PPOR
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*OUTPUT,HISTORY,OP=ADD
*NODE OUTPUT,NSET=RECRD
POR,
*ENDSTEP