Output variables

Output is provided with the commands *NODE FILE and *EL FILE in the .frd file (ASCII), with the commands *NODE OUTPUT and *ELEMENT OUTPUT in the .frd file (binary) and with the commands *NODE PRINT and *EL PRINT in the .dat file (ASCII). Binary .frd files are much shorter and can be faster read by CalculiX GraphiX. Nodal variables (selected by the *NODE FILE, *NODE OUTPUT and *NODE PRINT keywords) are always stored at the nodes. Element variables (selected by the *EL FILE, *ELEMENT OUTPUT and *ELEMENT PRINT keywords) are stored at the integration points in the .dat file and at the nodes in the .frd file. Notice that element variables are more accurate at the integration points. The values at the nodes are extrapolated values and consequently less accurate. For example, the von Mises stress and the equivalent plastic strain at the integration points have to lie on the stress-strain curve defined by the user underneath the *PLASTIC card, the extrapolated values at the nodes do not have to.

In fluid networks interpolation is used to calculate the nodal values at nodes in which they are not defined. Indeed, due to the structure of a network element the total temperature, the static temperature and the total pressure are determined at the end nodes, whereas the mass flow is calculated at the middle nodes. Therefore, to guarantee a continuous representation in the .frd file the values of the total temperature, the static temperature and the total pressure at the middle nodes are interpolated from their end node values and the end node values of the mass flow are determined from the neighboring mid-node values. This is not done for .dat file values (missing values are in that case zero).

A major different between the FILE and PRINT requests is that the PRINT requests HAVE TO be accompanied by a set name. Consequently, the output can be limited to a few nodes or elements. The output in the .frd file can but does not have to be restricted to subsets. If no node set is selected by using the NSET parameter (both for nodal and element values, since output in the .frd file is always at the nodes) output is for the complete model.

The following output variables are available:

Table: (continued)
Table 18: List of output variables.

variable	meaning	type	.frd file	.dat file
CDIS	relative contact displacements	nodal	CONTACT	x
			CONTACTI	x
PEEQ	equivalent plastic strain	int.point	PE	x
CELS	contact energy	nodal	CELS	x
CF	total contact force	surface		x
CFN	total normal contact force	surface		x
CFS	total shear contact force	surface		x
CNUM	total number of contact elements	model		x
COORD	coordinates	int.point		x
CP	pressure coefficient in a compressible	nodal	CP3DF	x
	3D fluid
CSTR	contact stress	nodal	CONTACT	x
			CONTACTI	x
DEPF	fluid depth in 3D shallow water calculations	nodal	DISP
DEPT	fluid depth in a channel network	nodal	DEPTH
DTF	fluid time increment in 3D fluids	nodal	DTIMF
DRAG	stress on surface	surface		x
E	Lagrange strain	int.point	TOSTRAIN	x
			TOSTRAII	x
EBHE	heating power due to induction	elem		x
ECD	electric current density	int.point	CURR
ELKE	kinetic energy	element		x
ELSE	internal energy	element		x
EMAS	mass and mass moments of inertia	element		x
EMFB	magnetic field	int.point	EMFB
EMFE	electric field	int.point	EMFE
ENER	internal energy density	int.point	ENER	x
ERR	error estimator for the worst principal stress	int.point	ERROR
			ERRORI
EVOL	volume	element		x
FLUX	flux through surface	surface		x
HCRI	critical depth in a channel network	nodal	HCRIT
HER	error estimator for the temperature	int.point	HERROR
			HERRORI
HFL	heat flux in a structure	int.point	FLUX	x
HFLF	heat flux in a 3D fluid	int.point	FLUX	x
KEQ	stress intensity factor	nodal	CT3D-MIS
MACH	Mach number in a compressible 3D fluid	nodal	M3DF	x
MAXE	worst principal strain	int.point	MSTRAIN
	in cyclic symmetric
	frequency calculations
MAXS	worst principal stress	int.point	MSTRESS
	in cyclic symmetric
	frequency calculations
MAXU	worst displacement	nodal	MDISP
	orthogonal to a given vector
	in cyclic symmetric
	frequency calculations
ME	mechanical strain	int.point	MESTRAIN	x
			MESTRAII	x
MF	mass flow in a network	nodal	MAFLOW	x
NT	structural temperature	nodal	NDTEMP	x
	total temperature in a network
PCON	amplitude and phase of the relative contact	nodal	PCONTAC
	displacements and contact stresses
PEEQ	equivalent plastic strain	int.point	PE	x
PHS	magnitude and phase	int.point	PSTRESS
	of stress
PN	network pressure	nodal		x
	(generic term for any of the above)
PNT	magnitude and phase	nodal	PNDTEMP
	of temperature
POT	electric potential	nodal	ELPOT
PRF	magnitude and phase of external forces	nodal	PFORC
PS	static pressure in a liquid network	nodal	STPRES	x
PSF	static pressure in a 3D fluid	nodal	PS3DF	x
PT	total pressure in a gas network	nodal	TOPRES
PTF	total pressure in a 3D fluid	nodal	PT3DF	x
PU	magnitude and phase	nodal	PDISP
	of displacement
RF	total force	nodal	FORC	x
			FORCI	x
RFL	total flux	nodal	RFL	x
S	Cauchy stress (structure)	int.point	STRESS	x
			STRESSI	x
SDV	internal variables	int.point	SDV	x
SEN	sensitivity	nodal	SEN
SF	total stress (3D fluid)	int.point	STRESS
SMID	Cauchy stress (shells)	int.point	STRMID
SNEG	Cauchy stress (shells)	int.point	STRNEG
SOAREA	section area	surface		x
SOF	section forces	surface		x
SOM	section moments	surface		x
SPOS	Cauchy stress (shells)	int.point	STRPOS
SVF	viscous stress (3D fluid)	int.point	VSTRES	x
THE	thermal strain	int.point	THSTRAIN
TS	static temperature in a network	nodal	STTEMP	x
TSF	static temperature in a 3D fluid	nodal	TS3DF	x
TT	total temperature in a gas network	nodal	TOTEMP
TTF	total temperature in a 3D fluid	nodal	TT3DF	x
TURB	turbulence variables in a 3D fluid	nodal	TURB3DF
U	displacement	nodal	DISP	x
			DISPI	x
V	velocity of a structure	nodal	VELO	x
VF	velocity in a 3D fluid	nodal	V3DF	x
ZZS	Zienkiewicz-Zhu stress	int.point	ZZSTR
			ZZSTRI