*HEADING
THREE - D VERIFICATION PROBLEM FOR SURFACE CONTACT IN ACOUSTICS.
TRANSIENT
**
** See ch. 1.10.5 of ABAQUS Benchmark Manual
** The nofn nodes may be reduced
*PREPRINT,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.
*NGEN,NSET=NALL1
1,41
2001,2041
*NGEN,NSET=NALL2
1001,1041
3001,3041
*NFILL,NSET=NALL
NALL1,NALL2,2,500
*ELEMENT,TYPE=AC3D6,ELSET=ELEMENTS_1
    1,    1, 2001, 1001,    5, 2005, 1005,
    2, 1001, 2001, 3001, 1005, 2005, 3005,
*ELGEN,ELSET=ELEMENTS_1
1,10,4,2
2,10,4,2
*ELSET,ELSET=LINER5
1,2
*NGEN,NSET=ALL_NODES
1,41
1001,1041
2001,2041
3001,3041
*NCOPY,OLDSET=ALL_NODES,NEWSET=ALL_NODES,SHIFT,CHANGENUMBER=10000
0.0,10.0,0.0
1.0,0.0,0.0,0.0,1.0,0.0,0.0
*ELEMENT,TYPE=AC3D4,ELSET=ELEMENTS_2
20001, 10001, 10003, 12003, 11001
20002, 10003, 12003, 11001, 11003
20003, 12003, 11001, 11003, 13003
20004, 10001, 12003, 12001, 11001
20005, 12003, 12001, 11001, 13003
20006, 12001, 11001, 13003, 13001
*ELGEN,ELSET=ELEMENTS_2
20001,20,2,6
20002,20,2,6
20003,20,2,6
20004,20,2,6
20005,20,2,6
20006,20,2,6
*ELSET, ELSET=ALL_ELEMENTS
ELEMENTS_1, ELEMENTS_2
*ELSET, ELSET=SURF
19, 20
*elset,elset=liner4
20004
*elset,elset=liner6
20006
*MATERIAL,NAME=AIR
*DENSITY
1.293
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176e5
*SOLID SECTION,MATERIAL=AIR,ELSET=ALL_ELEMENTS
*NSET,NSET=OUTPUT_NODES,GEN
1,41
10001,10041
*NSET,NSET=DRIVEN_NODES
10041,11041,12041,13041
***********************************************
*Elset,Elset=ODB_ESET
ALL_ELEMENTS,
*Nset, Nset=ODB_NSET,GENERATE
1,14000 
************************************* 
*AMPLITUDE,NAME=SINE,DEFINITION=PERIODIC 
1,628.0,0.0,0.0 
0.0,1.0,0.0,0.0
***********************************************
*SURFACE ,NAME=RIGHT
20,S2
19,S2
*SURFACE ,NAME=LEFT
LINER4,S4
LINER6,S2
*TIE,NAME=LR
LEFT,RIGHT
*************************************
*STEP
*DYNAMIC,EXPLICIT
,0.04
*BOUNDARY,AMPLITUDE=SINE
DRIVEN_NODES,8,,1.
*IMPEDANCE
LINER5,I1
**************************
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=ODB_NSET
POR,
**
** Output requests for qa testing (QA_TEST)
**
*OUTPUT,FIELD,NUMBER INTERVAL=1
*NODE OUTPUT
POR,
*OUTPUT,HISTORY,VAR=PRESELECT,TIME INTERVAL=0.01
*ENDSTEP