Running analyses, result postprocessing

This part describes how to run required analysis, what kind of results can be obtained and type of result postprocessing.

Running of analyses

The user is expected to have prepared a plain input file for the given analysed problem. Additionally, the corresponding module have to be compiled (MEFEL, TRFEL or METR). For large problems, it is better to use optimizing switches with debugging symbols on (optdeb target in Linux) for the compiler options due to increasing of computational speed and preserving detailed error messages.

Mechanical problems can be computed with MEFEL module by the following command:

mefel filem.in

 where filem.in is the input file. If the keywords are used in some part of the filem.in, the module option -kwd=n has to be used:

  • -kwd=1 switches keywords on in the section of problem description
  • -kwd=2 switches keywords on in the section of output setup
  • -kwd=3 switches keywords on in both sections above
Having the keywords used in both problem description and output setup sections, the MEFEL should be run by command:

mefel filem.in -kwd=3

Transport problems can be computed with TRFEL module by the following command:

trfel filet.in

 where filet.in is the input file. The keyword handling switch is the same as the one in MEFEL.

Coupled mechanical and transport problems can be computed with METR module by the following command:

metr filec.in

 where filec.in is the input file. The keyword handling switch is the same as the one in MEFEL.

Result postprocessing

Generally, there are three types of result output that can be specified in the output setup section of the input file:
  • Plain text output
  • Graphical postprocessor output
  • Tabular text output

Plain text output

This kind of output is intended for the basic result viewing rather of simple examples. All result quantities can be specified at nodes or elements (integration point values) to be written at selected steps and they are marked by text comments so these files can be used for the user provided convertor to the desired result format. Usually, the file name extension .out is given to these output files.

Graphical post processor output

GiD result file is the main format for the graphical postprocessing. Similarly to plain text output, all result quantities can be specified at nodes or elements (integration point values) to be written at selected steps. Two types of file are created for GiD postprocessor:

  • file.msh - file with the mesh description,
  • file.res - file with the result values of selected quantities
For large nonlinear problems, it is possible to split the result file into several files. Each part contains results in selected steps of one selected quantity. These files can be loaded into GiD by the Merge command in File menu.

Tabular text output

This kind of output can be produced in nonlinear or time dependent analyses. It is intended for the assembling of charts from the selected quantities. The selected quantities are printed in on one row of the file for each selected time/load step. These files can be loaded into the various chart tools such as Grace (Linux/Windows), Gnuplot (Linux/Windows), MS Excel (Windows) and Excel clone LibreCalc (Linux/Windows), etc.


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