Mechanical APDL Basic Analysis Guide - Ansys
Mechanical APDL Basic Analysis Guide - Ansys Mechanical APDL Basic Analysis Guide - Ansys
Chapter 7:The General Postprocessor (POST1) • You can use the element table as a "worksheet" to do calculations among results data. This feature is described in Additional POST1 Postprocessing (p. 170). • To save the element table, issue SAVE,Fname,Ext in POST1 or issue /EXIT,ALL when exiting the ANSYS program. (If you are using the GUI, follow the prompts in the dialog boxes that appear when you choose Utility Menu> File> Save as or Utility Menu> File> Exit.) This saves the table along with the rest of the database onto the database file. • To erase the entire element table from memory, issue ETABLE,ERASE (Main Menu> General Postproc> Element Table> Erase Table). (Or issue ETABLE,Lab,ERASE to erase just the Lab column of the element table). The element table will automatically be erased from memory if you issue a RESET command (Main Menu> General Postproc> Reset). 7.1.4. Special Considerations for Principal Stresses Principal stresses for SHELL61 elements are not readily available for review in POST1. By default, the principal stresses are available for all line elements except in either of the following cases: • You have requested an interpolated time point or angle specification on the SET command. • You have performed load case operations. In the above cases (including all cases for SHELL61), you must choose Main Menu> General Postproc> Load Case> Line Elem Stress or issue the command LCOPER,LPRIN in order to calculate the principal stresses. Then you may access this data through ETABLE, or any appropriate printing or plotting command. 7.1.5. Reading in FLOTRAN Results To read results data from the FLOTRAN "residual" file into the database, issue the FLREAD command (Main Menu> General Postproc> Read Results> FLOTRAN 2.1A). FLOTRAN results (Jobname.RFL) are read with the normal postprocessing functions or commands, such as SET (Utility Menu> List> Results> Load Step Summary). 7.1.6. Resetting the Database The RESET command (Main Menu> General Postproc> Reset), allows you to re-initialize the POST1 command defaults portion of the database without leaving POST1. The command has the same effect as leaving and re-entering the ANSYS program. 7.2. Reviewing Results in POST1 Once the desired results data are stored in the database, you can review them through graphics displays and tabular listings. In addition, you can map the results data onto a path (for details, see Mapping Results onto a Path (p. 155)). 7.2.1. Displaying Results Graphically Graphics displays are perhaps the most effective way to review results. You can display the following types of graphics in POST1: • Contour displays • Deformed shape displays • Vector displays 136 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
• Path plots • Reaction force displays • Particle flow traces. 7.2.1.1. Contour Displays Contour displays show how a result item (such as stress, temperature, magnetic flux density, etc.) varies over the model. Four commands are available for contour displays: Command(s): PLNSOL GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Nodal Solu Command(s): PLESOL GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Element Solu Command(s): PLETAB GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Elem Table Command(s): PLLS GUI: Main Menu> General Postproc> Plot Results> Line Elem Res The PLNSOL command produces contour lines that are continuous across the entire model. Use either for primary as well as derived solution data. Derived solution data, which are typically discontinuous from element to element, are averaged at the nodes so that continuous contour lines can be displayed. Sample contour displays of primary data (TEMP) and derived data (TGX) are shown below. PLNSOL,TEMP ! Primary data: degree of freedom TEMP Figure 7.1 Contouring Primary Data with PLNSOL If PowerGraphics is enabled, you can control averaging of derived data with the following: Command(s): AVRES GUI: Main Menu> General Postproc> Options for Outp Utility Menu> List> Results> Options Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 7.2.1. Displaying Results Graphically 137
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• Path plots<br />
• Reaction force displays<br />
• Particle flow traces.<br />
7.2.1.1. Contour Displays<br />
Contour displays show how a result item (such as stress, temperature, magnetic flux density, etc.) varies over<br />
the model. Four commands are available for contour displays:<br />
Command(s): PLNSOL<br />
GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Nodal Solu<br />
Command(s): PLESOL<br />
GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Element Solu<br />
Command(s): PLETAB<br />
GUI: Main Menu> General Postproc> Plot Results> Contour Plot> Elem Table<br />
Command(s): PLLS<br />
GUI: Main Menu> General Postproc> Plot Results> Line Elem Res<br />
The PLNSOL command produces contour lines that are continuous across the entire model. Use either for<br />
primary as well as derived solution data. Derived solution data, which are typically discontinuous from element<br />
to element, are averaged at the nodes so that continuous contour lines can be displayed.<br />
Sample contour displays of primary data (TEMP) and derived data (TGX) are shown below.<br />
PLNSOL,TEMP ! Primary data: degree of freedom TEMP<br />
Figure 7.1 Contouring Primary Data with PLNSOL<br />
If PowerGraphics is enabled, you can control averaging of derived data with the following:<br />
Command(s): AVRES<br />
GUI: Main Menu> General Postproc> Options for Outp<br />
Utility Menu> List> Results> Options<br />
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information<br />
of ANSYS, Inc. and its subsidiaries and affiliates.<br />
7.2.1. Displaying Results Graphically<br />
137
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