*HEADING
 : UFLUID TEST USING F2D2
(1x1x1 BLOCK, USER DEFINED FLUID)
*RESTART, WRITE, FREQ=99
*NODE, NSET=CAVITY-1_NODES
*ELEMENT, TYPE=F2D2, ELSET=CAVITY-1
**
**              HYDROSTATIC FLUID PROPERTY
**
*FLUID PROPERTY, ELSET=CAVITY-1, REFNODE=1, TYPE=USER, NAME=CAVITY-GAS
**
**              SPRINGS
**
*ELEMENT, TYPE=SPRING1, ELSET=SPRINGY1
*SPRING, ELSET=SPRINGY1
2,
1.E-8,
*BOUNDARY
2,  1, 2, 0.0
4,  1, 1, 0.0
*INITIAL CONDITIONS, TYPE=TEMPERATURE
1, 200.
*EQUATION
**
**              STEP 1: APPLY LOAD AT T=200
**
*STEP, NLGEOM
*STATIC
.2, 1.
*CLOAD
4, 2, -100.
*NODE PRINT
U,NT11,PCAV,CVOL
*NODE FILE,FREQ=99
U,NT,PCAV,CVOL
*OUTPUT,FIELD,FREQ=99
*NODE OUTPUT
U,NT,PCAV,CVOL
*ENERGY PRINT
*ENERGY FILE
*OUTPUT,HISTORY,FREQUENCY=1
*ENERGY OUTPUT,VARIABLE=PRESELECT
*END STEP
**
**              STEP 2: INCREASE FLUID TEMPERATURE TO 300
**
*STEP, NLGEOM
*STATIC
.5, 1.
*TEMPERATURE
1, 300.
*END STEP
**
**              STEP 3: ADD 5.0 UNITS OF MASS AT T=300
**
*STEP, NLGEOM
*STATIC
.5, 1.
*FLUID FLUX
*END STEP
**
**              STEP 4: REMOVE 5.0 UNITS OF MASS AT T=300
**
*STEP, NLGEOM
*STATIC
.5, 1.
*FLUID FLUX
*END STEP
**
**              STEP 5: DECREASE FLUID TEMPERATURE TO 200
**
*STEP, NLGEOM
*STATIC
.5, 1.
*TEMPERATURE
1, 200.
*FLUID FLUX,OP=NEW
*END STEP