Product: ABAQUS/Standard
User subroutine DFLOW:
can be used to define the variation of the seepage magnitude as a function of position, time, pore pressure, etc. in a soils consolidation analysis;
will be called at each flow integration point for each element-based or surface-based nonuniform flow definition in the analysis; and
ignores any amplitude references that may appear with the associated nonuniform flow definition.
SUBROUTINE DFLOW(FLOW,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 FLOW
RETURN
ENDFLOW
Effective velocity of pore fluid crossing the surface at this point from the inside of the region modeled to the outside of the region modeled. Units are LT–1. Effective velocity is the volumetric flow rate per unit area (refer to “Permeability,” Section 20.7.2 of the ABAQUS Analysis User's Manual).
FLOW will be passed into the routine as the magnitude of the seepage specified as part of the element-based or surface-based flow definition. If the magnitude is not defined, FLOW will be passed in as zero.
The effective velocity is not available for output purposes.
U
Estimated pore pressure at this time 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
Integration point number on the element's surface.
COORDS
An array containing the coordinates of this 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 DFLOW is being made through the element-based flow definition. This information is useful when several different nonuniform distributed flows are being imposed on an element at the same time. See Part VI, “Elements,” of the ABAQUS Analysis User's Manual for identification of element faces. The key is as follows:
SNAME
Surface name for which this call to DFLOW is being made through the surface-based flow definition (JLTYP=0). For an element-based flow definition the surface name is passed in as a blank.