*HEADING
 : F3D3 FLUID ELEMENT TEST 
(1x1x1 BLOCK, HYDRAULIC, NO BULK MODULUS, NO THERMAL EXPANSION)
*RESTART, WRITE, FREQ=1
*NODE, NSET=CAV1NOD
  1, 1., 1., 1.
  2, 2., 1., 1.
  3, 2., 2., 1.
  4, 1., 2., 1.
  5, 1., 1., 0.
  6, 2., 1., 0.
  7, 2., 2., 0.
  8, 1., 2., 0.
*NSET,NSET=REFNODE
 1,
*ELEMENT, TYPE=F3D3, ELSET=CAV1
1, 2, 3, 6
2, 3, 7, 6
3, 7, 3, 4
4, 4, 8, 7
5, 6, 7, 8
6, 5, 6, 8
*FLUID PROPERTY, ELSET=CAV1, REFNODE=1, TYPE=HYDRAULIC
*FLUID DENSITY
10., 
*ELEMENT, TYPE=SPRING1, ELSET=SPRINGX1
21, 2
*SPRING, ELSET=SPRINGX1
1, 
400., 
*ELEMENT, TYPE=SPRING1, ELSET=SPRINGY1
42, 4
*SPRING, ELSET=SPRINGY1
2, 
1.E-6,
*BOUNDARY
2, 2, 3, 0.0
3, 2, 3, 0.0
4, 1, 1, 0.0
4, 3, 3, 0.0
5, 1, 3, 0.0
6, 2, 3, 0.0
7, 3, 3, 0.0
8, 1, 1, 0.0
8, 3, 3, 0.0
*EQUATION
2, 
3, 1, 1.0, 2, 1, -1.0
2, 
6, 1, 1.0, 2, 1, -1.0
2, 
7, 1, 1.0, 2, 1, -1.0
2, 
3, 2, 1.0, 4, 2, -1.0
2, 
7, 2, 1.0, 4, 2, -1.0
2, 
8, 2, 1.0, 4, 2, -1.0
*STEP, NLGEOM
*STATIC
.2, 1.
*CLOAD
4, 2, -600.
*NODE PRINT,FREQ=100
U,PCAV,CVOL
*NODE FILE,FREQ=100
U,PCAV,CVOL
*OUTPUT,FIELD,FREQ=100
*NODE OUTPUT
U,
*OUTPUT,HISTORY
*NODE OUTPUT, NSET=REFNODE
PCAV,CVOL
*ENERGY FILE
*OUTPUT,HISTORY,FREQUENCY=1
*ENERGY OUTPUT,VARIABLE=PRESELECT
*ENERGY PRINT
*END STEP