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  
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  
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