Next: Program Parameters Up: CalculiX USER'S MANUAL - Previous: File Formats Contents
Input Devices''. Then, begin with a result file called result.frd. Just type
and some information is echoed in the xterm and a new window called main window appears on the screen. The name conventions used for the different areas in the main-window are explained in figure 2. Now you should move the mouse pointer into the menu-area and press the left mouse-button. Keep it pressed and continue over the menu item ``Dataset'' to ``Disp''. There you release the button. Then press the left button again and continue over ``Dataset'' and ``Entity'' to ``D1''. For background informations look into the subsection ''Datasets'' and ''Entity'' which explains how to display results. After seeing the values you might play around a bit with the ''Menu''. See also the commands ''steps'', ''max'', ''min'', ''scal'' which might be used to modify the colour representation of the displayed values. For example type ``min 0'' to change the lower value of the colour bar. Watch out if you type a command; the cgx window MUST stay active and not the xterm from which the program was started. It is better to stay with the mouse pointer in the cgx window. Next, ''Quit'' the program and type
''cgx -b geometry.fbd''
in the xterm. The program starts again but now you see only a wire-frame of the geometry. Move the mouse-pointer into the new window and type ''mesh all''. The mouse-pointer MUST stay in this window during typing and NOT in the xterm from which the program was started. After you see ''ready'' in the parent xterm, the mesh is created. To actually see it, type ''plus ea all''. Now you see the mesh in green color. To see the mesh as a wire-frame, choose in the main menu''Viewing'' and continue to the entry ''Toggle Element Edges'' and then again in ''Viewing'' choose ''Dots''. To see the mesh illuminated chose in the main menu ''Viewing'' and continue to the entry ''Show Elements With Light''. To see it filled, choose in the main menu ''Viewing'' and continue to the entity ''Fill''. Most of the time it is sufficient to see the surface elements only. For this purpose, choose in the main menu ''Viewing'' and continue to the entry ''Toggle Surfaces/Volumes''. If you start cgx in the post processor mode, as you did in the first example (cgx result.frd), the surface mode is automatically set. To see the interior of the structure, choose in the main menu ''Viewing'' and continue to the entity ''Toggle Culling Back/Front''. To save the mesh in the format used by the solver, type ''send all abq''. To store the mesh in the result format type ''send all frd''.
To create a new model start the cgx by typing
''cgx -b file''
where ''file'' will be the name of the new model if you later exit the program with the command ''exit''. The way to create a model from scratch is roughly as follows, create
You can write a file with basic commands like ''pnt'' to create the basis for your construction and read it with the ''read'' command. Most commands can be used in batch mode. This allows the user to write a command file for repeated actions.
The interactive commands start with the letter 'q'. Please make yourself familiar with all of them before you start to model complex geometry.
After the geometry is created, the divisions of the lines can be changed to control the density of the elements. Display the lines and their divisions with
- ''plot ld all''.
- ''elty all''
- ''elty all he20''.
- ''del mesh''
- ''mesh all''.
- ''send all abq''.
It is advisable to save your work from time to time without exiting the program. This is done with the command
A solver input file can be written with the help of an editor (emacs, nedit etc.). If you write a ccx command file, then include the mesh, the boundary conditions etc. with the ccx command ''*INCLUDE''. After you finished your input-file for the solver (ccx) you might read it by calling the program again with
''cgx -c solverfile.inp''
for a final check. All predefined sets are available together with automatically generated sets which store boundaries, equations and more. These sets start with the ''+''-sign. For example the set +bou stores all constrained nodes where the set +bou1, +bou2, +bou3 store the constraints for the individual directions. Further the set +dep and +ind store the dependent and independent nodes involved in equations etc. See which sets are defined with the command
- ''prnt se''.
- ''plot p 5''
- ''plot p blade''
Then run the input file with ccx. The result file (.frd) can be visualized with
''cgx filename.frd filename.inp''
were the solver input file ''filename.inp'' is optional. With this file, the sets, boundary conditions and loads used in the calculation are available together with the results.
If you have problems doing the above or if you want to learn more and in more detail about the cgx continue with the tutorial  and look in the appendix, section Tips and Hints and Known Problems.
Next: Program Parameters Up: CalculiX USER'S MANUAL - Previous: File Formats Contents root 2012-10-04