Mapping Commands from Old to New FLAC2D Syntax

This document lists commands from FLAC 8.1 (and earlier) and provides links to their FLAC2D 9 (and later) counterparts. Tip: using page search for the browser (Ctrl+F) can help locate a command quickly; the list below is extensive.

Table 1: Index For This Page: Commands by Function vs 8.1 Command

Boundary Conditions Applied at Gridpoints	APPLY
Boundary Conditions Applied at Faces	APPLY
Remove Boundary Conditions	APPLY
Zone Attachment	ATTACH
General Program, Model, and Utility Operations	CALL, CONFIG, CONTINUE, CYCLE, DEFINE/END, ECHO, EXIT, HELP, LOAD, NEW, PAUSE, PLAYBACK, QUIT, RESTORE, RETURN, SAVE, SOLVE, STEP, STOP, SYSTEM, TABLE, TITLE, TRACE, TRACK
Set & Remove Gridpoint and Zone Conditions	FIX, FREE
Zone Generation Operations	GENERATE, GRID
Group Command	GROUP
History Operations	HISTORY
Initialization Operations	INITIAL
Interface Operations	INTERFACE
Print Operations	PRINT
Constitutive Model Assignment and Properties	MODEL, PROPERTY
Configuration Operations	SET
Structural Element Operations	STRUCT
Fluid-Flow Analysis Operations & Utilities	WATER, CONFIG, TRACK

Table 2: Boundary Conditions Applied at Gridpoints

FLAC 8.1	FLAC2D 9.0
APPLY ff	zone dynamic free-field
APPLY nacc	zone face apply acceleration-normal
APPLY nvelocity	zone face apply velocity-normal
APPLY relax	zone relax (note: this is not exactly equivalent. See zone relax for details.)
APPLY saccel	zone face apply acceleration-strike
APPLY svelocity	zone face apply velocity-strike
APPLY xaccel	zone face apply acceleration-x
APPLY xforce	zone gridpoint fix force-applied-x
APPLY xvelocity	zone face apply velocity-x
APPLY yaccel	zone face apply acceleration-y
APPLY yforce	zone gridpoint fix force-applied-y
APPLY yvelocity	zone face apply velocity-y
	FLUID-FLOW BOUNDARIES
APPLY pp	zone face apply pore-pressure
APPLY pwell	zone gridpoint fix well
APPLY nwdischarge	no equivalent. Two-phase flow not supported.
APPLY nwpp	no equivalent. Two-phase flow not supported.
	THERMAL BOUNDARIES
APPLY temperature	zone face apply temperature

Table 3: Boundary Conditions Applied at Faces

FLAC 8.1	FLAC2D 9.0
APPLY dquiet	zone face apply quiet-dip
APPLY dstress	zone face apply stress-dip
APPLY nquiet	zone face apply quiet-normal
APPLY nstress	zone face apply stress-normal
APPLY pressure	zone face apply stress-normal (note: there is no direct equivalent. zone face apply stress-normal assumes compression negative.)
APPLY squiet	zone face apply quiet-strike
APPLY sstress	zone face apply stress-strike
APPLY sxx	zone face apply stress-xx
APPLY sxy	zone face apply stress-xy
APPLY syy	zone face apply stress-yy
APPLY xquiet	zone face apply quiet (note: not a direct equivalent. Quiet boundaries cannot be specified by component in FLAC2D)
APPLY xtraction	zone face apply stress-xx
APPLY yquiet	zone face apply quiet (note: not a direct equivalent. Quiet boundaries cannot be specified by component in FLAC2D)
APPLY ytraction	zone face apply stress-yy
	FLUID-FLOW BOUNDARIES
APPLY discharge	zone face apply discharge
APPLY leakage	zone face apply leakage
	THERMAL BOUNDARIES
APPLY convection	zone face apply convection
APPLY flux	zone face apply flux

Table 4: Remove Boundary Conditions

FLAC 8.1	FLAC2D 9.0
APPLY remove <keyword>	zone face apply-remove, zone apply-remove, or zone gridpoint free (un- fix) in opposition to the apply-type command used to create the boundary, as listed above

Table 5: Zone Attachment

FLAC 8.1	FLAC2D 9.0
ATTACH	zone attach by-face
ATTACH remove	zone attach delete

Table 6: General Program, Model, and Utility Operations

FLAC 8.1	FLAC2D 9.0
CALL	program call
CONFIG ats	no direct equivalent. See zone water commands with keyword effective.
CONFIG axisymmetry	model configure axisymmetry
CONFIG cppudm	model configure plugin
CONFIG creep	model configure creep
CONFIG dynamic	model configure dynamic
CONFIG extra	no longer required. 128 extra variables available by default.
CONFIG gwflow	model configure fluid
CONFIG p_stress	no equivalent. Plane stress not supported.
CONFIG thermal	model configure thermal
CONFIG tpflow	no equivalent. Two-phase flow not supported.
CONTINUE	program continue
COPY	no equivalent
CYCLE	model cycle
DEFINE … END	fish define and end (note end is a statement, not a command, so it is not preceded by fish)
GUI	no equivalent
HELP	help
IEBOUNDARY	no equivalent
MOVIE	plot movie. Plot name must be given as a string.
NEW	model new
OPT	no equivalent
PAUSE	program pause
PLOT	plot item
QUIT	program quit
RESTORE	model restore
RETURN	program return
SAVE	model save
SCNLIN	no equivalent
SOLVE	model solve
SOLVE fos	model factor-of-safety
STEP	model step
STOP	program stop
SYSTEM	program system
TABLE	table add (and associated commands)
TITLE	model title
TRACK	zone fluid track
WINDOW	plot export bitmap size. Note that a plot name must be given as a string.

Table 7: Set & Remove Gridpoint and Zone Conditions

FLAC 8.1	FLAC2D 9.0
FIX/FREE pp	zone gridpoint fix pore-pressure, zone gridpoint free pore-pressure
FIX/FREE nwpp	no equivalent. Two-phase flow not supported.
FIX/FREE saturation	no equivalent
FIX/FREE seepage	no equivalent. Two-phase flow not supported.
FIX/FREE temperature	zone gridpoint fix temperature, zone gridpoint free temperature
FIX/FREE x	zone gridpoint fix velocity-x, zone gridpoint free velocity-x
FIX/FREE y	zone gridpoint fix velocity-y, zone gridpoint free velocity-y

Table 8: Zone Generation Operations

FLAC 8.1	FLAC2D 9.0
GENERATE	no true equivalent. See zone create and zone generate
GRID	zone create quad
MARK	no direct equivalent. See zone gridpoint group
REZONE	no equivalent. Rezoning not supported.
UNMARK	no direct equivalent. See zone gridpoint group remove

Table 9: Group Command

FLAC 8.1	FLAC2D 9.0
GROUP	zone group

Table 10: History Operations

FLAC 8.1	FLAC2D 9.0
HISTORY	Adding a history on an object is done through the object; for instance, zone history or structure node history or fish history, etc. Histories at gridpoints are done using the gridpointid or position keywords in the zone history command.
	:literal:`　 Zone and Gridpoint Histories`
HISTORY angle	no equivalent
HISTORY esxx	zone history stress-effective xx
HISTORY esxy	zone history stress-effective xy
HISTORY esyy	zone history stress-effective yy
HISTORY eszz	zone history stress-effective zz
HISTORY ex_n	zone history extra. USe keyword index to specify the index.
HISTORY gpp	zone history pore-pressure
HISTORY hyst	no equivalent
HISTORY gpp	zone history pore-pressure. Use keyword gridpointid to specify a specific gridpoint.
HISTORY property	zone history property
HISTORY sig1	zone history stress. Use keyword quantity minimum.
HISTORY sig2	zone history stress. Use keyword quantity maximum.
HISTORY ssi	no equivalent
HISTORY ssi3d	zone history strain-increment. Use keyword :lkwd`quantity shear-maximum`
HISTORY ssr	no equivalent
HISTORY ssr3d	zone history strain-rate. Use keyword :lkwd`quantity shear-maximum`
HISTORY sxx	zone history stress. Use keyword quantity xx
HISTORY sxy	zone history stress. Use keyword quantity xy
HISTORY syy	zone history stress. Use keyword quantity yy
HISTORY szz	zone history stress. Use keyword quantity zz
HISTORY temperature	zone history temperature
HISTORY vsi	zone history strain-increment. Use keyword quantity volumetric
HISTORY vsr	zone history strain-rate. Use keyword quantity volumetric
HISTORY vsxx	no equivalent
HISTORY vsxy	no equivalent
HISTORY vsyy	no equivalent
HISTORY vszz	no equivalent
HISTORY x	no equivalent
HISTORY xacceleration	zone history acceleration-x
HISTORY xdisplacement	zone history displacement-x
HISTORY xvelocity	zone history velocity-x
HISTORY y	no equivalent
HISTORY yacceleration	zone history acceleration-y
HISTORY ydisplacement	zone history displacement-y
HISTORY yvelocity	zone history velocity-y
	:literal:`　 Structural Element Histories`
HISTORY element	Command depends on element type, e.g. structure beam history
HISTORY node	structure node history
	:literal:`　 Global Histories`
HISTORY crtime	model history creep time-total
HISTORY dytime	model history dynamic time-total
HISTORY gwtime	model history fluid time-total
HISTORY thtime	model history thermal time-total
HISTORY dt	model history timestep
HISTORY delete	history delete
HISTORY dump	history list series
HISTORY hist_rep	history interval
HISTORY label	history.name a label (see history name label)
HISTORY limits	history list limit
HISTORY list	history list series
HISTORY max	no equivalent
HISTORY ncycle	history interval
HISTORY nstep	history interval
HISTORY purge	history purge
HISTORY reset	history delete
HISTORY read	no equivalent
HISTORY write	history list series
HISTORY sratio	model history mech ratio
HISTORY unbalance	model history mech unbalanced-maximum

Table 11: Initialization Operations

FLAC 8.1	FLAC2D 9.0
INITIAL biot_modulus	zone gridpoint initialize biot-modulus
INITIAL dy_damp	zone dynamic damping
INITIAL density	zone initialize density
INITIAL ex_n	zone initialize extra or zone gridpoint initialize extra
INITIAL f2modulus	no equivalent. Two-phase flow not supported.
INITIAL fmodulus	zone gridpoint initialize fluid-modulus
INITIAL ftension	zone gridpoint initialize fluid-tension
INITIAL k0	zone initialize-stresses. Use keyword ratio.
INITIAL nwpp	no equivalent. Two-phase flow not supported.
INITIAL pp	zone gridpoint initialize pore-pressure
INITIAL rsat	no equivalent. Two-phase flow not supported.
INITIAL saturation	zone gridpoint initialize saturation
INITIAL st_damp	zone mechanical damping
INITIAL sxx	zone initialize stress-xx
INITIAL sxy	zone initialize stress-xy
INITIAL syy	zone initialize stress-yy
INITIAL szz	zone initialize stress-zz
INITIAL temperature	zone gridpoint initialize temperature
INITIAL udcoe	no equivalent. Two-phase flow not supported.
INITIAL vga	TO BE DECIDED
INITIAL vgp0	TO BE DECIDED
INITIAL vgpcnw	TO BE DECIDED
INITIAL vgpcw	TO BE DECIDED
INITIAL visrat	no equivalent. Two-phase flow not supported.
INITIAL wk11	TO BE DECIDED
INITIAL wk12	TO BE DECIDED
INITIAL wk22	TO BE DECIDED
INITIAL wpermeability	TO BE DECIDED
INITIAL x	zone gridpoint initialize position-x
INITIAL xdisplacement	zone gridpoint initialize displacement-x
INITIAL xvelocity	zone gridpoint initialize velocity-x
INITIAL y	zone gridpoint initialize position-y
INITIAL ydisplacement	zone gridpoint initialize displacement-y
INITIAL yvelocity	zone gridpoint initialize velocity-y

Table 12: Interface Operations

FLAC 8.1	FLAC2D 9.0
in 8.1 syntax integer i is supplied where 1 appears in this column	in 9.0 syntax i is a string (that may be a numeral)
INTERFACE 1 aside …	no direct translation; see zone interface create by-face for alternative construction
INTERFACE 1 from node …	no direct translation; see zone interface create by-face for alternative construction
INTERFACE 1 cohesion	zone interface '1' node property cohesion (see zone interface node property)
INTERFACE 1 dilation	zone interface '1' node property dilation (see zone interface node property)
INTERFACE 1 friction	zone interface '1' node property friction (see zone interface node property)
INTERFACE 1 glued	no equivalent
INTERFACE 1 kn	zone interface '1' node property stiffness-normal (see zone interface node property)
INTERFACE 1 ks	zone interface '1' node property stiffness-shear (see zone interface node property)
INTERFACE 1 tbond	zone interface '1' node property tension (see zone interface node property)
INTERFACE 1 unglued	no equivalent
INTERFACE 1 bslip	zone interface '1' node property bonded-slip (see zone interface node property)
INTERFACE 1 sbratio	zone interface '1' node property shear-bond-ratio (see zone interface node property)
INTERFACE 1 remove	zone interface '1' element delete (see zone interface element delete)

Table 13: Label Operations

FLAC 8.1	FLAC2D 9.0
LABEL arrow	data label create arrow
LABEL line	no equivalent.
LABEL plot	data label create text
LABEL table	table label
LABEL delete	data label delete
LABEL history	no direct equivalent. See plot item with keyword history-locations.
the first four above optionally take an index with the “id” keyword (i.e., LABEL id 1 arrow),	in which case the corresponding translation is data label create name "1" arrow, where the index is now a string (that may be a numeral)

Table 14: Constitutive Model Assignment and Properties

FLAC 8.1	FLAC2D 9.0
MODEL	zone cmodel assign
PROPERTY	zone property (and also see zone property-distribution)

Table 15: Print Operations

FLAC 8.1	FLAC2D 9.0
PRINT apply	zone list apply or zone face list apply
PRINT attach	zone attach list
PRINT density	zone list density
PRINT dy_damp	model dynamic list
PRINT dy_state	zone list state
PRINT esxx	zone list stress-effective
PRINT esxy	zone list stress-effective
PRINT esyy	zone list stress-effective
PRINT eszz	zone list stress-effective
PRINT ex_n	zone gridpoint list extra or zone list extra
PRINT f2modulus	no equivalent. Two-phase flow not supported.
PRINT fastflow	model fluid list
PRINT fastwb	no equivalent
PRINT fish	fish list
PRINT fishcall	fish list callbacks
PRINT fix	zone gridpoint list fluid
PRINT fluid	model fluid list
PRINT fmodulus	zone gridpoint list fluid
PRINT ftension	zone gridpoint list fluid
PRINT funsat	no equivalent
PRINT giicpath	no equivalent
PRINT gpm	zone gridpoint list information (note: actual mass is given, not inverse)
PRINT gpp	zone gridpoint list fluid
PRINT group	group list
PRINT head	no equivalent
PRINT history	history list
PRINT hyst	zone list hysteretic
PRINT iface 1	zone interface "1" list (see zone interface list) or zone interface node "1" list (see zone interface list)
PRINT information	program list information
PRINT jrepath	no equivalent
PRINT label	data label list
PRINT limits	model mechanical list
PRINT mark	no equivalent
PRINT memory	program list memory
PRINT model	program list plugins
PRINT nfunstep	no equivalent
PRINT nwpp	no equivalent. Two-phase flow not supported.
PRINT permeability	zone fluid list property permeability
PRINT poro	zone fluid list property porosity
PRINT pp	zone gridpoint list fluid
PRINT rsat	no equivalent. Two-phase flow not supported.
PRINT saturation	zone gridpoint list fluid
PRINT sdif	no equivalent
PRINT sig1	zone list principal
PRINT sig2	zone list principal
PRINT sratio	no equivalent
PRINT ssi	no equivalent
PRINT ssi3d	zone list strain
PRINT ssr	no equivalent
PRINT ssr3d	zone list strain
PRINT state	zone list state
PRINT structure beam	structure beam list
PRINT structure cable	structure cable list
PRINT structure hinge	no equivalent
PRINT structure liner	structure liner list
PRINT structure node	structure node list
PRINT structure pile	structure pile list
PRINT structure property	structure beam list propery, structure cable list property , etc.
PRINT structure rockbolt	structure pile list
PRINT structure shell	structure shell list
PRINT structure strip	structure geogrid list
PRINT structure support	no equivalent
PRINT sxx	zone list stress, use zone list triangle stress for information about individual overlapping triangles in a zone.
PRINT sxy	zone list stress, use zone list triangle stress for information about individual overlapping triangles in a zone.
PRINT syy	zone list stress, use zone list triangle stress for information about individual overlapping triangles in a zone.
PRINT szz	zone list stress, use zone list triangle stress for information about individual overlapping triangles in a zone.
PRINT table 1	table "1" list (see table list)
PRINT temperature	zone gridpoint list temperature
PRINT theta	no equivalent
PRINT track	zone fluid track list
PRINT udcoe	no equivalent. Two-phase flow not supported.
PRINT version	program list version
PRINT vga	to be decided
PRINT vgp0	to be decided
PRINT vgpcnw	to be decided
PRINT vgpcw	to be decided
PRINT vcirat	no equivalent. Two-phase flow not supported
PRINT vol_strain	no equivalent
PRINT vsi	no equivalent
PRINT vsr	no equivalent
PRINT vsxx	no equivalent?
PRINT vsxy	no equivalent?
PRINT vsyy	no equivalent?
PRINT vszz	no equivalent?
PRINT wk11	to be decided
PRINT wk12	to be decided
PRINT wk22	to be decided
PRINT wpermeability	to be decided
PRINT x	zone gridpoint list position
PRINT xacc	zone gridpoint list acceleration
PRINT xdisp	zone gridpoint list displacement
PRINT xflow	no equivalent
PRINT xreaction	zone gridpoint list force ??
PRINT xvel	zone gridpoint list velocity
PRINT y	zone gridpoint list position
PRINT yacc	zone gridpoint list acceleration
PRINT ydisp	zone gridpoint list displacement
PRINT yflow	no equivalent
PRINT yreaction	zone gridpoint list force ??
PRINT yvel	zone gridpoint list velocity
PRINT $fish	no equivalent
zone properties can be printed using zone list property

Table 16: Configuration Operations

FLAC 8.1	FLAC2D 9.0
SET 3d_damping	no equivalent
SET a_us	no equivalent
SET a3	no equivalent
SET a4	no equivalent
SET aspect	no equivalent
SET ats	no direct equivalent. See zone water commands with keyword effective.
SET aunb	model solve unbalanced-average
SET autoname	no equivalent
SET back	plot background. The specific plot must be specified with a string.
SET beep	no equivalent
SET biot	zone fluid biot
SET cd	See program system
SET clock	model solve clock
SET columns	no equivalent
SET corr_ffrot	no equivalent
SET crdt	model creep timestep
SET creeptime	model creep time-total
SET cust1	program customer-title-1
SET cust2	program customer-title-1
SET damping	zone mechanical damping
SET datum	no equivalent
SET display	model display
SET doswindow	no equivalent
SET dxf	See geometry import and other geometry commands.
SET dy_damping	zone dynamic damping
SET dydt	model dynamic timestep
SET dyn	model dynamic
SET dytime	model dynamic time-total
SET echo	program echo
SET fastflow	zone fluid fastflow
SET fastwb	no equivalent (yet)
SET ficolor no equivalent
SET fishcall	fish callback
SET flow	model fluid
SET fobl	model creep timestep lower-bound
SET fobu	model creep timestep upper-bound
SET force	model solve unbalanced-maximum
SET foreground See different :cmd`plot` commands
SET fos_step	model factor-of-safety characteristic-steps
SET fpcoef	zone fluid fastflow-relaxation
SET funsat	no equivalent
SET giicpath	no equivalent
SET gravity	model gravity
SET gwdt	model fluid timestep
SET gwtime model fluid time-total
SET hbm	zone property constant-mb
SET hbs	zone property constant-s
SET hisfile	history export file
SET implicit	zone fluid implicit or zone thermal implicit
SET jrepath	no equivalent
SET large	model large-strain
SET log	program log and program log-file
SET maxdt	model creep timestep maximum
SET maxgiicmem	no equivalent
SET mech	model mechanical
SET message	no equivalent
SET mindt	model creep timestep minimum
SET multistep	zone dynamic multi-step
SET munb	model solve unbalanced-maximum
SET ncont	can be done with plot command switches
SET ncwrite	no equivalent
SET nfunstep	no equivalent
SET ngw	model fluid substep
SET nmech	model mechanical substep
SET nther	model thermal substep
SET output	plot export bitmap filename. Note that the plot name must be given as a string.
SET overlay	no equivalent
SET overwrite	no equivalent
SET pagelength	no equivalent
SET paginate	program pagination
SET pcx	no direct equivalent. See plot export bitmap
SET plot	see various plot commands
SET pita	see zone property normal
SET pitc	zone property cohesion or zone property joint-cohesion
SET pitf	zone property friction or zone property joint-friction
SET pitt	zone property tension or zone property joint-tension
SET pmom_func	no equivalent
SET psterminator	no equivalent
SET range	can be done with plot command switches
SET replot	no equivalent
SET rez_func	no equivalent
SET seed	model random
SET small	model largestrain off
SET st_damping	zone mechanical damping
SET step	model solve cycles
SET sym	no equivalent
SET symscale	can be done with plot command switches
SET synchronize	no equivalent
SET temperature	no equivalent
SET thdt	model thermal timestep
SET thermal	model thermal
SET tolint	zone interface tolerance-contact
SET ucs	zone property constant-sci
SET umul	model creep timestep upper-multiplier
SET update	zone geometry-update
SET vector	can be done with plot command switches
SET xform	no equivalent

Table 17: Structural Element Operations

FLAC 8.1	FLAC2D 9.0
STRUCTURE beam begin … end … seg	structure beam create
STRUCTURE beam delete	structure beam delete
STRUCTURE beam interface	beams in FLAC2D do not have interfaces
STRUCTURE cable begin … end … seg	structure cable create
STRUCTURE cable delete	structure cable delete
STRUCTURE cable tension	structure cable apply tension
STRUCTURE chprop	use structure cable property etc.
STRUCTURE hinge	no equivalent
STRUCTURE liner begin … end … seg	structure liner create
STRUCTURE liner delete	structure liner delete
STRUCTURE liner interface	structure liner property coupling-yield-normal and similar coupling properties
STRUCTURE node load	structure node apply
STRUCTURE node pin	See structure node join
STRUCTURE node slave	See structure link attach
STRUCTURE node unslave	See structure link attach and structure link delete
STRUCTURE node initial	structure node initialize
STRUCTURE node system	structure node system-local
STRUCTURE pile begin … end … nseg	structure pile create
STRUCTURE pile delete	structure pile delete
STRUCTURE property	structure beam property, structure cable property, structure geogrid property, structure liner property, structure pile property, structure shell property
STRUCTURE rockbolt begin … end … nseg	structure pile create. use structure pile property rockbolt-flag
STRUCTURE rockbolt delete	structure pile delete. use structure pile property rockbolt-flag
STRUCTURE shell begin … end … nseg	structure pile create
STRUCTURE shell delete	structure pile delete
STRUCTURE strip begin … end … seg	structure geogrid create
STRUCTURE strip delete	structure geogrid delete

Table 18: Fluid-Flow Analysis Operations & Utilities

FLAC 8.1	FLAC2D 9.0
WATER auto	no equivalent
WATER biot_c	zone fluid property biot
WATER bound	no equivalent
WATER bulk	zone fluid property biot, zone gridpoint initialize fluid-modulus
WATER density	zone water density
WATER nwdensity	no equivalent, two-phase flow not currently supported
WATER secap	no equivalent, two-phase flow not currently supported
WATER table	zone water plane
CONFIG fluid	model configure fluid
TRACK	zone fluid track create