*HEADING
PATCH TEST FOR ACOUSTIC ELEMENTS IN ABAQUS/EXPLICIT [AC3D6]
**
** 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=AC3D6, ELSET=EALL
    1,   10,  100,   20,  110,  400,  120,
    2,   20,  100,  202,  120,  400,  302,
    3,   10,   12,  100,  110,  420,  400,
    4,  100,   12,  102,  400,  420,  402,
    5,  100,  102,  202,  400,  402,  302,
    6,  202,  102,  200,  302,  402,  300,
    7,  202,  200,   20,  302,  300,  120,
    8,   20,  200,   22,  120,  300,  320,
    9,  102,   12,  200,  402,  420,  300,
   10,  200,   12,   22,  300,  420,  320,
   11,  302,  300,  120,  400,  402,  110,
   12,  120,  300,  320,  110,  402,  420,
   13,   20,   22,  202,   10,   12,  100,
   14,  202,   22,  200,  100,   12,  102,
*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