*HEADING
 : FLUID LINK TEST FOR SS ANALYSIS WITH F2D2
 (2-1x1x1 BLOCKS, PNEUMATIC FLUID)
 TEST 9-DIGIT LABELS
*PREPRINT,ECHO=YES,HIST=YES,MODEL=YES
*NODE, NSET=FLUID_CAVITY-1_NODES
900000001, 1., 1.
900000002, 2., 1.
900000003, 2., 2.
900000004, 1., 2.
900000005, 3., 1.
900000006, 3., 3.
900000007, 1., 3.
900000011, 4., 1.
*NSET,NSET=FLUID_LINK-1
900000001,900000011
*NSET,NSET=FLUID_CAVITY-1
900000004
*ELEMENT, TYPE=CPE4, ELSET=STRUCTURE
  900000001,  900000002,  900000005,  900000006,  900000003
  900000002,  900000003,  900000006,  900000007,  900000004 
*SOLID SECTION, ELSET=STRUCTURE, MATERIAL=ELAS
*MATERIAL, NAME=ELAS
*ELASTIC
 1.0E-3
*SURFACE,TYPE=ELEMENT,NAME=CAV1
 900000001, S4
 900000002, S4
*PHYSICAL CONSTANTS, ABSOLUTE ZERO=-460., UNIVERSAL GAS CONSTANT=1.0
*FLUID CAVITY, NAME=CAVITY1, BEHAVIOR=FLUID, SURFACE=CAV1, REFNODE=900000001,AMBIENT PRESS=10.
 1.0
*FLUID BEHAVIOR, NAME=FLUID
*MOLECULAR WEIGHT
 660.0
**
**              FLUID LINK 
**
*FLUID EXCHANGE, NAME=LINK, PROP=LINKBEHAVIOR
 900000001,900000011
*FLUID EXCHANGE PROPERTY, NAME=LINKBEHAVIOR, TYPE=BULK
 0.1, 
**
**              SPRING
**
*ELEMENT, TYPE=SPRING1, ELSET=SPRINGY1
900000021,900000004
*SPRING, ELSET=SPRINGY1
 2, 
 1.,
*BOUNDARY
900000002,  1, 2, 0.0
900000004,  1, 1, 0.0
*INITIAL CONDITIONS, TYPE=TEMPERATURE
900000001, 200.
900000011, 200.
*EQUATION
 2, 
900000003, 1, 1.0
900000002, 1,-1.0
 2, 
900000003, 2, 1.0
900000004, 2,-1.0
**
**              STEP 1: SET MASS FLOW RATE 
**                      INTO CAVITY TO 10
**
*STEP, NLGEOM
*STATIC,DIRECT
 .125, 1.
*MODEL CHANGE, REMOVE
 STRUCTURE
*FLUID FLUX
900000011, 10.
*OUTPUT,FIELD
*ELEMENT OUTPUT
 MFL,MFLT
*NODE OUTPUT
 U,
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=FLUID_LINK-1
 PCAV,CVOL
*NODE OUTPUT,NSET=FLUID_CAVITY-1
 U,
*NODE PRINT,NSET=FLUID_LINK-1,FREQ=9999
 PCAV,CVOL
*EL PRINT,FREQ=0
*END STEP
**
**              STEP 2: HOLD PRESSURE AT 
**                      NODE 11 FIXED
**
*STEP, NLGEOM
*STATIC,DIRECT
 .125, 1.
*FLUID FLUX, OP=NEW
*BOUNDARY, fixed
900000011, 8
*END STEP
**
**              STEP 3: RAMP PRESSURE AT
**                      NODE 11 UP TO 5
**
*STEP, NLGEOM
*STATIC,DIRECT
 .125,1.
*BOUNDARY
900000011, 8, 8, 5.
*END STEP
**
**              STEP 4: HOLD SYSTEM FIXED
**
*STEP, NLGEOM
*STATIC
 .2, 1.
*BOUNDARY, OP=NEW
900000002,  1, 2, 0.0
900000004,  1, 1, 0.0
*END STEP