*HEADING
PATCH TEST FOR ACOUSTIC ELEMENTS IN ABAQUS/EXPLICIT [AC3D8R]
**
** P=C0+C1*X+C2*Y+C3*Z; C0=0.0; C1=200; C2=100;C3=200
** THE ACOUSTIC PRESSURES AT THE INTERIOR NODES ARE:
** P_100=211.2;P_300=287.5; P_400=122.4; 
** P_402=175.6; ETC
** SEE CH. 1.5.9 OF ABAQUS/VERIFICATION MANUAL
**
*PREPRINT,ECHO=YES,HISTORY=YES,MODEL=YES
*NODE, NSET=NALL
10,0.,0.,1.
20,1.,0.,1.
120,1.,0.,0.
110,0.,0.,0.
100,0.32,0.186,0.643
202,0.677,0.305,0.683
302,.826,.288,.288
400,.249,.342,.192
102,.165,.745,.702
200,.788,.693,.644
300,.850,.649,.263
402,.273,.750,.230
12,0.,1.,1.
22,1.,1.,1.
320,1.,1.,0.
420,0.,1.,0.
*NSET,NSET=QA_TEST
102,200,300,402,100,202,302,400
*NSET,NSET=NOUT
QA_TEST
*ELEMENT,TYPE=AC3D8R, ELSET=EALL
1,10,20,120,110,100,202,302,400
2,10,100,400,110,12,102,402,420
3,100,202,302,400,102,200,300,402
4,202,20,120,302,200,22,320,300
5,102,200,300,402,12,22,320,420
6,302,120,110,400,300,320,420,402
7,20,202,100,10,22,200,102,12
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ACOUSTIC MEDIUM,BULK MODULUS
2.0E+09, 
*DENSITY
1.0E+03, 
**
*AMPLITUDE,NAME=RAMP,DEF=SMOOTH STEP
0.0,0.0,0.02,1.0,0.03,1.0
*RESTART,WRITE,NUM=10
*STEP
*DYNAMIC, EXPLICIT
,0.03
*BOUNDARY,AMP=RAMP
 10, 8,  ,200.
 20, 8,  ,400.
120, 8,  ,200.
110, 8,  , 0.0
 12, 8,  ,300.
 22, 8,  ,500.
320, 8,  ,300.
420, 8,  ,100.
*******************
*OUTPUT,FIELD, NUM=1
*NODE OUTPUT, NSET=QA_TEST
POR
*NODE OUTPUT
POR
*******************
*OUTPUT,HISTORY, TIME INTERVAL=0.0015
*NODE OUTPUT, NSET=NOUT
POR
*******************
*END STEP