ABAQUS Volume II: I–Z - Manual (Page 405)

*SFLOW
18.9 *SFLOW: Define seepage coefficients and associated sink pore pressures normal to
a surface.
This option is used to provide seepage coefficients and sink pore pressures to control pore fluid flow normal
to the surface in consolidation analysis.
Product: ABAQUS/Standard
Type: History data
Level: Step
References:
•
“Pore fluid flow,” Section 27.4.6 of the ABAQUS Analysis User’s Manual
•
“FLOW,” Section 1.1.7 of the ABAQUS User Subroutines Reference Manual
Optional parameters:
AMPLITUDE
Set this parameter equal to the name of the amplitude curve that gives the variation of reference pore
pressure with time. If this parameter is omitted, the reference magnitude is applied immediately
at the beginning of the step or linearly over the step depending on the value assigned to the
AMPLITUDE parameter on the *STEP option (see “Procedures: overview,” Section 6.1.1 of the
ABAQUS Analysis User’s Manual). The AMPLITUDE parameter is ignored for nonuniform
seepage flow boundary conditions defined in user subroutine FLOW and for drainage-only seepage
boundary conditions.
OP
Set OP=MOD (default) to modify existing flows or to define additional flows.
Set OP=NEW if all existing *SFLOWs applied to the model should be removed. New flows
can be defined.
Data lines to define uniform seepage:
First line:
1. Surface name.
2. Seepage flow type label Q.
3. Reference pore pressure value, . (Units of FL
−2
.)
4. Reference seepage coefficient value, . (Units of F
−1
L
3
T
−1
.)
Repeat this data line as often as necessary to define uniform seepage for various surfaces.
18.9–1
ABAQUS Version 6.1 Module: ID:
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