*CFLOW

Specify concentrated fluid flow.

This option is used to apply concentrated fluid flow to any node including phantom nodes in enriched elements in consolidation problems.

This page discusses:

See Also
In Other Guides
Coupled Pore Fluid Diffusion and Stress Analysis
Geostatic Stress State
Pore Fluid Flow
Modeling Discontinuities as an Enriched Feature Using the Extended Finite Element Method

ProductsAbaqus/Standard

TypeHistory data

LevelStep

Optional parameters

AMPLITUDE

Set this parameter equal to the name of the amplitude curve that defines the magnitude of the flow during the step. 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 Defining an Analysis).

OP

Set OP=MOD (default) for existing CFLOWs to remain, with this option modifying existing concentrated flows or defining additional concentrated flows.

Set OP=NEW if all existing CFLOWs applied to the model should be removed.

PHANTOM

This parameter applies only to enriched elements in Abaqus/Standard.

Set PHANTOM=NODE to apply concentrated flows to a phantom node that is originally located coincident with the specified real node in an enriched element.

Set PHANTOM=EDGE to apply concentrated flows to a phantom node located at an element edge between the two specified real corner nodes in an enriched element.

Set PHANTOM=INCLUDED to indicate that the pore pressure applied to a phantom node located at an element edge will be interpolated automatically from the specified real corner nodes when the enriched element is cracked.

Data lines to define concentrated flow when the PHANTOM parameter is not used

First line

  1. Node number or node set label.

  2. (Not used.)

  3. Reference concentrated flow magnitude.

Repeat this data line as often as necessary to define concentrated flows.

Data lines to define concentrated flow when PHANTOM=NODE

First line

  1. Node number of a real node that is originally located coincident with the phantom node.

  2. (Not used.)

  3. Reference concentrated flow magnitude.

Repeat this data line as often as necessary to define concentrated flows.

Data lines to define concentrated flow when PHANTOM=EDGE

First line

  1. Node number of one of the two real corner nodes to define an edge in an enriched element.

  2. Node number of the other real corner node to define an edge in an enriched element.

  3. Reference concentrated flow magnitude.

Repeat this data line as often as necessary to define concentrated flows.

Data lines to define concentrated flow when PHANTOM=INCLUDED

First line

  1. Node number or node set label.

  2. (Not used.)

  3. Reference concentrated flow magnitude.

Repeat this data line as often as necessary to define concentrated flows.