*HEADING
  3D FLUID ELEMENT - a spherical fluid filled cavity in a cube
**
*PART, name=FIL-1
**
*NODE
  1,    0.,      0.,      0.
  2,   10.,      0.,      0.
  3,    0.,     10.,      0.
  4,   10.,     10.,      0.
  5,    0.,      0.,     10.
  6,   10.,      0.,     10.
  7,    0.,     10.,     10.
  8,   10.,     10.,     10.
  9,    5.,      0.,      0.
 10,    0.,      5.,      0.
 11,    0.,      0.,      5.
 12,   3.535,    3.535,   0.
 13,    0.,      3.535,   3.535
 14,   3.535,    0.000,   3.535
 15,   2.888,    2.888,   2.888
**                        
**
*ELEMENT, TYPE=C3D8,  ELSET=SURROUND
**
  1,  4,   2,   6,   8,  12,   9,  14,  15
  2,  3,   4,   8,   7,  10,  12,  15,  13
  3,  8,   6,   5,   7,  15,  14,  11,  13
**
** 4 noded Fluid elements
**
*ELEMENT, TYPE=F3D4, ELSET=FLUID
   11,  14,   15,  12,    9
   12,  15,   13,  10,   12
   13,  11,   13,  15,   14
**
*NODE, NSET=MFLUID
 880,  0, 0.
*FlUID PROPERTY, NAME=VENT,ELSET=FLUID,REF NODE=880,TYPE=hydraulic
*FLUID DENSITY
 1.E+2
*FLUID BULK MODULUS
 2.2E2
**
*SOLID SECTION, ELSET=SURROUND, MATERIAL=FIL
 1.,
*END PART
**
*assembly, name=assembly-1
*instance, name=FIL-1-1, part=FIL-1
**
*END INSTANCE
**
*NSET, NSET=BASE, INSTANCE=FIL-1-1,  internal          
  2,  3,  4,  9,  10,  12
**
*NSET, NSET=YSYMM, INSTANCE=FIL-1-1,  internal
   2, 5,  6,  9,  11, 14              
** 
*NSET, NSET=XSYMM, INSTANCE=FIL-1-1, internal
   3, 5,  7,   10,  11,  13                              
** 
*ELSET, ELSET=E1, internal, INSTANCE=FIL-1-1
  1, 2, 3     
**
*SURFACE, TYPE=ELEMENT, name=outside
  E1, S1
**
*NSET, NSET=MFLUID, internal, INSTANCE=FIL-1-1
  880,
*end assembly
**
*MATERIAL, NAME=FIL
*ELASTIC
  1.E3 , 0.25
*DENSITY
  1600.
**
**
*BOUNDARY
  XSYMM,   1, 1,  0.
  YSYMM,   2, 2,  0.
   BASE,   3, 3,  0.
**
*Amplitude, name=Amp-1, definition=PERIODIC
1,      62.28,           0.,           1.
          0.,           1.
**=======================================
**
*STEP,inc=1000, nlgeom
**
*STATIC, stabilize
  0.2E-2,   1.,  1.0E-15, 0.4E-1
**
*DSLOAD,AMPLITUDE=Amp-1
outside,  P,  800
**
**  
*Output, history
*NODE OUTPUT, NSET=MFLUID
PCAV, CVOL
**
*output, field
*node output, variable=preselect
U
*element output, variable=preselect
S, LE
*END STEP