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## 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
U | displacement | nodal | x | x
PU | magnitude and phase | nodal | x |
| of displacement |  |  |
MAXU | worst displacement | nodal | x |
| orthogonal to a given vector |  |  |
| in cyclic symmetric |  |  |
| frequency calculations |  |  |
NT | structural temperature | nodal | x | x
| total temperature in a network |  |  |
PNT | magnitude and phase | nodal | x |
| of temperature |  |  |
TT | total temperature in a gas network | nodal | x |
TS | static temperature in a network | nodal | x | x
TTF | total temperature in a 3D fluid | nodal | x | x
TSF | static temperature in a 3D fluid | nodal | x | x
RF | reaction force | nodal | x | x
RFL | reaction flux | nodal | x | x
PT | total pressure in a gas network | nodal | x |
PS | static pressure in a liquid network | nodal | x | x
PN | network pressure (generic term for any of the above) | nodal |  | x
PTF | total pressure in a 3D fluid | nodal | x | x
PSF | static pressure in a 3D fluid | nodal | x | x
CP | pressure coefficient in a compressible 3D fluid | nodal | x | x
DEPT | fluid depth in a channel network | nodal | x |
HCRI | critical depth in a channel network | nodal | x |
MF | mass flow in a network | nodal | x | x
V | velocity of a structure | nodal | x | x
VF | velocity in a 3D fluid | nodal | x | x
MACH | Mach number in a compressible 3D fluid | nodal | x | x
S | Cauchy stress (structure) | element | x | x
SF | total stress (3D fluid) | element | x |
SVF | viscous stress (3D fluid) | element | x | x
ZZS | Zienkiewicz-Zhu stress | element | x |
PHS | magnitude and phase | element | x |
| of stress |  |  |
MAXS | worst principal stress | element | x |
| in cyclic symmetric |  |  |
| frequency calculations |  |  |
HFL | heat flux in a structure | element | x | x
HFLF | heat flux in a 3D fluid | element | x | x
E | Lagrange strain | element | x | x
MAXE | worst principal strain | element | x |
| in cyclic symmetric |  |  |
| frequency calculations |  |  |
PEEQ | equivalent plastic strain | element | x | x
ENER | internal energy | element | x | x
SDV | internal variables | element | x | x
ELSE | internal energy | whole |  | x
|  | element |  |
ELKE | kinetic energy | whole |  | x
|  | element |  |
EVOL | volume | whole |  | x
|  | element |  |
DRAG | stress on surface | surface |  | x
FLUX | flux through surface | surface |  | x
POT | electric potential | nodal | x |
ECD | electric current density | element | x |
EMFE | electric field | element | x |
EMFB | magnetic field | element | x |

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