Product: ABAQUS/Standard
User subroutine FLOW:
can be used in a soils consolidation analysis to define the variation of the reference pore pressure and the seepage coefficient as functions of position, time, pore pressure, element number, integration point number, etc.;
will be called at each integration point of element surfaces for which element-based or surface-based nonuniform surface seepage flow is defined; and
ignores any amplitude references that may appear with the associated nonuniform flow definition.
SUBROUTINE FLOW(H,SINK,U,KSTEP,KINC,TIME,NOEL,NPT,COORDS,
1 JLTYP,SNAME)
C
INCLUDE 'ABA_PARAM.INC'
C
DIMENSION TIME(2), COORDS(3)
CHARACTER*80 SNAME
user coding to define H and SINK
RETURN
ENDH
Seepage coefficient at this point. Units are F–1L3T–1. H will be passed into the routine as the reference seepage coefficient value specified as part of the element-based or surface-based flow definition. If the reference value is not defined, H will be passed in as zero.
SINK
Sink pore pressure. SINK will be passed into the routine as the reference pore pressure value specified as part of the element-based or surface-based flow definition. If the reference value is not defined, SINK will be passed in as zero.
U
Estimated surface total pore pressure at this time and at this point.
KSTEP
Step number.
KINC
Increment number.
TIME(1)
Current value of step time (defined only in transient analysis).
TIME(2)
Current value of total time (defined only in transient analysis).
NOEL
Element number.
NPT
Surface integration point number.
COORDS
An array containing the coordinates of this integration point. These are the current coordinates if geometric nonlinearity is accounted for during the step (see “Procedures: overview,” Section 6.1.1 of the ABAQUS Analysis User's Manual); otherwise, the array contains the original coordinates of the point.
JLTYP
Identifies the element face for which this call to FLOW is being made for an element-based flow. This information is useful when several nonuniform flow conditions are being imposed on an element at the same time. See Part VI, “Elements,” of the ABAQUS Analysis User's Manual for identification of the element faces. The key is as follows:
SNAME
Surface name for which this call to FLOW is being made for a surface-based flow (JLTYP=0). For an element-based flow the surface name is passed in as a blank.