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Up: Kinematic Constraints
Previous: Kinematic Coupling Constraints
Initial conditions are entered as FEMGEN loads via the 'PROPERTY LOAD' or the 'PROPERTY INITIAL' command. The following initial conditions are supported:
| Initial Condition |
| Mass Flow Rate |
| Pore Pressure |
| Void Ratio |
| Rotating Velocity |
| Saturation |
| Stress |
| Geostatic Stress |
| Temperature |
| Velocity |
| Fluid Pressure |
Note:
The following sections describe the definition of these initial conditions.
There are 3 arguments, at least one of which one must be entered depending on the dimensionality of the elements to which the conditions apply.
| Argument(s) | Meaning |
| 1 | Mass flow rate per unit area (x) |
| 2 | Mass flow rate per unit area (y) |
| 3 | Mass flow rate per unit area (z) |
Example FEMGEN Command:
PROPERTY LOAD I-MFLOW S1 1 2 3
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=MASS FLOW RATE
S1 , 1.000000 , 2.000000 , 3.000000
There is 1 argument, which must be entered.
| Argument | Meaning |
| 1 | Fluid pore pressure |
Example FEMGEN Command:
PROPERTY LOAD I-PORE S1 1
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=PORE PRESSURE
S1 , 1.000000
There are 4 arguments, all of which must be entered.
| Arguments | Meaning |
| 1 | First value of void ratio |
| 2 | Vertical coordinate for the above value |
| 3 | Second value of void ratio |
| 4 | Vertical coordinate for the above value |
Example FEMGEN Command:
PROPERTY LOAD I-RATIO S1 1 2 3 4
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=RATIO
S1 , 1.000000 , 2.000000 , 3.000000 , 4.000000
There are 10 arguments, all of which must be entered.
| Arguments | Meaning |
| 1 | Angular Velocity about axis a b. |
| 2 | Global x-component of translational velocity |
| 3 | Global y-component of translational velocity |
| 4 | Global z-component of translational velocity |
| 5 | Global x-component of point a |
| 6 | Global y-component of point a |
| 7 | Global z-component of point a |
| 8 | Global x-component of point b |
| 9 | Global y-component of point b |
| 10 | Global z-component of point b |
Example FEMGEN Command:
PROPERTY LOAD I-RVEL S1 1 2 3 4 5 6 7 8 9 10
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=ROTATING VELOCITY
S1 , 1.000000 , 2.000000 , 3.000000 , 4.000000
5.000 , 6.000 , 7.000 , 8.000 , 9.000 , 10.00
There is 1 argument, which must be entered.
| Arguments | Meaning |
| 1 | Saturation value |
Example FEMGEN Command:
PROPERTY LOAD I-SATUR S1 1
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=SATURATION
S1 , 1.000000
There are 6 arguments, at least one of which must be entered depending upon the number of stress components which are applicable to the elements to which the conditions apply.
| Arguments | Meaning |
| 1 | First stress component |
| 2 | Second stress component |
| 3 | Third stress component |
| 4 | Fourth stress component |
| 5 | Fifth stress component |
| 6 | Sixth stress component |
Example FEMGEN Command:
PROPERTY LOAD I-STRESS S1 1 2 3 4 5 6
Corresponding ABAQUS Input File:
*INITIAL CONDITIONS, TYPE=STRESS S1 , 1.00 , 2.00 , 3.00 , 4.00 , 5.00 , 6.00
There are 6 arguments, all of which must be entered.
| Arguments | Meaning |
| 1 | First value of vertical component of effective stress |
| 2 | Vertical coordinate for the above value |
| 3 | Second value of vertical component of effective stress |
| 4 | Vertical coordinate for the above value |
| 5 | Coefficient of lateral stress (x-direction) |
| 6 | Coefficient of lateral stress (y-direction) |
Example FEMGEN Command:
PROPERTY LOAD I-GSTRES S1 1 2 3 4 5 6
Corresponding ABAQUS Input File:
*INITIAL CONDITIONS, TYPE=STRESS, GEOSTATIC S1 , 1.00 , 2.00 , 3.00 , 4.00 , 5.00 , 6.00
There are 7 arguments, of which at least one must be entered. Multiple temperature values are used in association with beam section points and through-thickness shell locations.
| Arguments | Meaning |
| 1 | Temperature |
| 2 | Temperature |
| 3 | Temperature |
| 4 | Temperature |
| 5 | Temperature |
| 6 | Temperature |
| 7 | Temperature |
Example FEMGEN Command:
PROPERTY LOAD I-TEMP S1 1 2 3 4 5
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=TEMPERATURE
S1 , 1.000000 , 2.000000 , 3.000000 , 4.000000 , 5.000000
There are 2 arguments, both of which must be entered.
| Arguments | Meaning |
| 1 | Velocity |
| 2 | Degree of Freedom |
Example FEMGEN Command:
PROPERTY LOAD I-VEL S1 50 1
Corresponding ABAQUS Input File:
*NSET, NSET=S1
1 2 3 4 5 6 7 8 9 10 11
*INITIAL CONDITIONS, TYPE=VELOCITY
S1 , 1, 50.00000
There is 1 argument, which must be entered.
| Argument | Meaning |
| 1 | Fluid pressure |
Example FEMGEN Command:
PROPERTY LOAD I-PRES P1 1
Corresponding ABAQUS Input File:
*NSET, NSET=P1
1
*INITIAL CONDITIONS, TYPE=FLUID PRESSURE
P1 , 1.000000
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