Ansys Free Student Software

Ansys Free Student Software

“Unknown error occurred during solution” error

    • Sfran
      Subscriber

      I am using Ansys 2022 R2 student version.  I'm doing static analyses on simple shapes ie. cylindrical, rectangular, etc. .  When I run the solution, I keep getting the error "An unknown error occurred during solution.  Check the Solver Output on the Solution Information object for possible causes."  I don't get any warning/error about too many nodes/elements and my nodes/elements are around 10k give or take, much less than th 32k allowed for the student version.  I have been able to get a solution sometimes if I increase the mesh size significantly for ex. to 0.75" for a cylinder that is only 1 inch long but if I reduced mesh size to say 0.5" I get the error.  Can anyone help?

    • Aniket
      Ansys Employee

      Can you check your solver output file? What error/s does it show?

      -Aniket

      How to access Ansys help links

      Guidelines for Posting on Ansys Learning Forum

    • Sfran
      Subscriber

      I tried but am unable to locate the file on my C:\drive.  The file path that Ansys provided in the "Solution Information" is below but it doesn't seem like it created the file or the file folders.  Not sure if I am missing something in searching for the file but I went to "C:\Users\lastname" but there is not an "AppData" folder there.  I also did a "C:\drive" search for the file name "file.err" but nothing was found.

      Note: I substituted "lastname" for privacy reasons in the path below.

      Below is from "Solution Information"

      *** NOTE ***                            CP =       3.062   TIME= 11:25:38
       The model data was checked and warning messages were found.

      C:\Users\lastname\AppData\Local\Temp\WB_lastname_12240_2\_ProjectScratch\ 
       \ScrA05E\file.err ) for these warning messages. 

    • Bill Bulat
      Ansys Employee

       

      Hello,

      Please save your project. For example, I saved a project to directory named "2023R1_test". I saved the project using the project name "xsient_piezo_acoustic". This will create directories such as those shown below. Several levels below the directory named "xsient_piezo_acoustic_files" ("your_project_name_files"), you will see a directory named "MECH". In the MECH directory there are two text files that may contain the reason(s) the run was not sucessful (solve.out & file .err). Please inspect these using any text editor (e.g., notepad).

      Happy New Year,

      Bill

    • Sfran
      Subscriber

      I saved the project per above.  Below is what the "file.err" file had and last part of the "solve.out" file.  I didn't see any errors in either file so not sure where to go from here.

      Contents of "file.err".

      /COM,ANSYS RELEASE 2022 R2           BUILD 22.2      UP20220516       13:23:33

       *** WARNING ***                         CP =       3.094   TIME= 13:23:37
       Element shape checking is currently inactive.  Issue SHPP,ON or         
       SHPP,WARN to reactivate, if desired.                                    

       *** WARNING ***                         CP =       3.453   TIME= 13:23:37
       Material number 2 (used by element 2583) should normally have at least  
       one MP or one TB type command associated with it.  Output of energy by  
       material may not be available. 

       

       

      Partial contents of "solve.out"
       *****  MAPDL SOLVE    COMMAND  *****

       *** WARNING ***                         CP =       3.094   TIME= 13:23:37
       Element shape checking is currently inactive.  Issue SHPP,ON or         
       SHPP,WARN to reactivate, if desired.                                    

       *** NOTE ***                            CP =       3.297   TIME= 13:23:37
       The model data was checked and warning messages were found.             
        Please review output or errors file (                                  
       C:\Users\lastname\AppData\Local\Temp\WB_lastname_9764_2\_ProjectScratch\S 
       Scr7CDD\file.err ) for these warning messages.                          

       *** SELECTION OF ELEMENT TECHNOLOGIES FOR APPLICABLE ELEMENTS ***
            --- GIVE SUGGESTIONS AND RESET THE KEY OPTIONS ---

       ELEMENT TYPE         1 IS SOLID187. IT IS NOT ASSOCIATED WITH FULLY INCOMPRESSIBLE
       HYPERELASTIC MATERIALS. NO SUGGESTION IS AVAILABLE AND NO RESETTING IS NEEDED.

       

       *** MAPDL - ENGINEERING ANALYSIS SYSTEM  RELEASE 2022 R2          22.2     ***
       Ansys Mechanical Enterprise Academic Student      
       00000000  VERSION=WINDOWS x64   13:23:37  JAN 02, 2023 CP=      3.359

       wbnew--Static Structural (A5)                                                 

       

                             S O L U T I O N   O P T I O N S

         PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D                  
         DEGREES OF FREEDOM. . . . . . UX   UY   UZ  
         ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
         OFFSET TEMPERATURE FROM ABSOLUTE ZERO . . . . .  459.67    
         EQUATION SOLVER OPTION. . . . . . . . . . . . .SPARSE             
         GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .SYMMETRIC  

       *** WARNING ***                         CP =       3.453   TIME= 13:23:37
       Material number 2 (used by element 2583) should normally have at least  
       one MP or one TB type command associated with it.  Output of energy by  
       material may not be available.                                          

       *** NOTE ***                            CP =       3.516   TIME= 13:23:37
       The step data was checked and warning messages were found.              
        Please review output or errors file (                                  
       C:\Users\lastname\AppData\Local\Temp\WB_lastname_9764_2\_ProjectScratch\S 
       Scr7CDD\file.err ) for these warning messages.                          

       *** NOTE ***                            CP =       3.562   TIME= 13:23:37
       The conditions for direct assembly have been met.  No .emat or .erot    
       files will be produced.                                                 

                            L O A D   S T E P   O P T I O N S

         LOAD STEP NUMBER. . . . . . . . . . . . . . . .     1
         TIME AT END OF THE LOAD STEP. . . . . . . . . .  1.0000    
         NUMBER OF SUBSTEPS. . . . . . . . . . . . . . .     1
         STEP CHANGE BOUNDARY CONDITIONS . . . . . . . .    NO
         PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
         DATABASE OUTPUT CONTROLS
            ITEM     FREQUENCY   COMPONENT
             ALL       NONE               
            NSOL        ALL               
            RSOL        ALL               
            EANG        ALL               
            ETMP        ALL               
            VENG        ALL               
            STRS        ALL               
            EPEL        ALL               
            EPPL        ALL               
            CONT        ALL               


       SOLUTION MONITORING INFO IS WRITTEN TO FILE= file.mntr                                                                                                                                                                                                                                                           

       

                               ***********  PRECISE MASS SUMMARY  ***********

         TOTAL RIGID BODY MASS MATRIX ABOUT ORIGIN
                     Translational mass               |   Coupled translational/rotational mass
              0.55957E-04    0.0000        0.0000     |     0.0000       0.61305E-09  -0.27292E-04
               0.0000       0.55957E-04    0.0000     |   -0.61305E-09    0.0000      -0.46874E-08
               0.0000        0.0000       0.55957E-04 |    0.27292E-04   0.46874E-08    0.0000    
           ------------------------------------------ | ------------------------------------------
                                                      |         Rotational mass (inertia)
                                                      |    0.16809E-04   0.26878E-08  -0.60965E-10
                                                      |    0.26878E-08   0.15910E-05  -0.61394E-09
                                                      |   -0.60965E-10  -0.61394E-09   0.16810E-04

         TOTAL MASS = 0.55957E-04
           The mass principal axes coincide with the global Cartesian axes

         CENTER OF MASS (X,Y,Z)=  -0.83769E-04   0.48773       0.10956E-04

         TOTAL INERTIA ABOUT CENTER OF MASS
              0.34980E-05   0.40158E-09  -0.61016E-10
              0.40158E-09   0.15910E-05  -0.31494E-09
             -0.61016E-10  -0.31494E-09   0.34985E-05
           The inertia principal axes coincide with the global Cartesian axes


        *** MASS SUMMARY BY ELEMENT TYPE ***

        TYPE      MASS
           1  0.559568E-04

       Range of element maximum matrix coefficients in global coordinates
       Maximum = 15489976.9 at element 1201.                                   
       Minimum = 506190.43 at element 674.                                     

         *** ELEMENT MATRIX FORMULATION TIMES
           TYPE    NUMBER   ENAME      TOTAL CP  AVE CP

              1      1654  SOLID187      1.875   0.001134
              2        52  SURF154       0.000   0.000000
       Time at end of element matrix formulation CP = 4.828125.                

       SPARSE MATRIX DIRECT SOLVER.
        Number of equations =        9030,    Maximum wavefront =    288
        Memory allocated for solver              =    26.376 MB
        Memory required for in-core solution     =    25.390 MB
        Memory required for out-of-core solution =    12.757 MB

       *** NOTE ***                            CP =       5.719   TIME= 13:23:39
       The Sparse Matrix Solver is currently running in the in-core memory     
       mode.  This memory mode uses the most amount of memory in order to      
       avoid using the hard drive as much as possible, which most often        
       results in the fastest solution time.  This mode is recommended if      
       enough physical memory is present to accommodate all of the solver      
       data.                                                                   

    • Aniket
      Ansys Employee

      so the file.err has only 2 warnings and no errors?

      -Aniket

      How to access Ansys help links

      Guidelines for Posting on Ansys Learning Forum

    • Sfran
      Subscriber

      Yes, correct. 

    • Sfran
      Subscriber

      I tried another part to analyze and got an error in the "file.err" file.  The full contents of the "file.err" file are shown below.

       

      /COM,ANSYS RELEASE 2022 R2           BUILD 22.2      UP20220516       12:53:11

       *** WARNING ***                         CP =       3.531   TIME= 12:53:17
       Element shape checking is currently inactive.  Issue SHPP,ON or         
       SHPP,WARN to reactivate, if desired.                                    

       *** WARNING ***                         CP =       3.828   TIME= 12:53:18
       Material number 2 (used by element 2023) should normally have at least  
       one MP or one TB type command associated with it.  Output of energy by  
       material may not be available.                                          

       *** ERROR ***                           CP =       6.859   TIME= 12:53:25
       An unexpected error ( SIG$ILL ) has occurred...  ANSYS internal data    
       has been corrupted.  ANSYS is unable to recover and will terminate.     
       Previously saved files are unaffected.  Please send the data leading    
       to this operation to your technical support provider, as this will      
       allow ANSYS, Inc to improve the program.

    • Aniket
      Ansys Employee

      Do you get this error for simple geometries as well? Or do you get it for specific ones?

      -Aniket

      How to access Ansys help links

      Guidelines for Posting on Ansys Learning Forum

    • Sfran
      Subscriber

      Yes, I am now getting this error in the "file.err" file for both simple and more complicated geometry.  I originally did not on a simple part geometry I did a static analysis on.  I did find another thread post that referenced "Mechanical APDL crashes with “SIG$ILL” during solving" and the thread said to add "-blas intel" under solve process settings>Advanced then in the Additional Command Line Arguments field add "-blas intel" without the quotes.  I did this and both the simple and more complicated models static analyses work and solved. 

    • Aniket
      Ansys Employee

      ok are you using shared memory parallel or distributed memory parallel? Check the physical cores available (N) on your machine, (Not Logical Processors) and run a simple model first using shared memory parallel (i.e. uncheck the Distributed checkmark) using N - 2 or N - 4 cores.

      -Aniket

      How to access Ansys help links

      Guidelines for Posting on Ansys Learning Forum

    • Sfran
      Subscriber

      I unchecked "distribute solution (if possible)" in solver process settings>advanced and removed "-blas intel" and ran a simple square tube beam with a load and one end fixed and it would not solve.  The "file.err" file only had 2 warnings shown below.  I then checked "distribute solution (if possible)" and added back the "-blas intel" in the Additional Command Line Arguments field and re-ran model which then solved.

      Entire contents of "file.err" file are below.

      OM,ANSYS RELEASE 2022 R2           BUILD 22.2      UP20220516       20:38:51

       *** WARNING ***                         CP =       1.484   TIME= 20:38:56
       Element shape checking is currently inactive.  Issue SHPP,ON or         
       SHPP,WARN to reactivate, if desired.                                    

       *** WARNING ***                         CP =       1.625   TIME= 20:38:56
       Material number 2 (used by element 2023) should normally have at least  
       one MP or one TB type command associated with it.  Output of energy by  
       material may not be available.                                          

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