Output and Restart

When FrontISTR is executed, it outputs a log file, a results file, and visualization data. Whether each file is output and what it contains depend on the analysis content and the specifications in the analysis control data.

Results File

The results file is enabled with !WRITE,RESULT, and the output variables are selected with !OUTPUT_RES. It stores the physical quantities per node and element for post-processing and for reading into another analysis. For the file names, placement, and how to check them after a run, see the execution guide.

In eigenvalue analysis, the results file holds the eigenvalue (EIGENVALUE) and the eigenvector for each mode obtained, regardless of !OUTPUT_RES. The eigenvector is output as the displacement (DISPLACEMENT). In a model with 6 degrees of freedom per node (a model with beam element 611 or shell elements 731, 741 and 743), the three translational components are output as DISPLACEMENT and the three rotational components as ROTATION. The visualization data has the same structure. The eigenvector is normalized so that the component with the largest absolute value among all degrees of freedom is +1.

The results file (extension .res) is text data with the following structure: a format version and comment at the top, then the global variables, and finally the output variables per node and element.

*fstrresult 2.0
*comment
<comment>
*global
<the number of global parameters>
<dof of global parameter> ...
<label of global parameter>
...
<value of global parameter>
...
*data
<the number of nodes> <the number of elements>
<the number of node variables> <the number of element variables>
<dof of node variable> ...
<label of node variable>
...
<value of node variable>
...
<dof of element variable> ...
<label of element variable>
...
<value of element variable>
...

Log File

The log file (extension .log) is a summary file that is always output after an analysis. In addition to the physical quantities per node and element, it outputs the maximum/minimum values of the displacement, strain, and stress components. For eigenvalue analysis, the eigenvalue, natural frequency, participation factors and effective masses of each mode are output. The participation factors are the values for the eigenvector normalized as above, whereas the effective masses do not depend on the normalization of the eigenvector. For the file name and placement, see the execution guide.