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luongo1

Unable to run Solver

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Hi, I can't seem to run the Optistruct solver because it cannot run element cleanup. I am new to Hyperworks application and do not know what is wrong with the particular element.


 


Thanks for the help.


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 The amount of memory allocated for the run is 300 MB.

 This run will use in-core processing in the solver.

 

 Element # 3878, element type TETRA.

 

 *** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

 

 

************************************************************************

 

 A fatal error has occurred during computations:

 

  *** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

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OPTIMIZATION PROBLEM PARAMETERS :

---------------------------------

 

 Objective Function  : Minimize Weighted Compliance

 

 ------------------

 Response Summary :

 ------------------

 

 Number of volume fraction responses   :          1

 Number of compliance responses        :          1

 Number of equation responses          :          1

 

   ------------------------

   Static Subcase Summary :

   ------------------------

 

   ----------   --------  --------  --------------

   Subcase ID    SPC ID   LOAD ID   Weight = w(i) 

   ----------   --------  --------  --------------

        1            1            2           1.000

   ----------   --------  --------  --------------

 

   ---------------------------

   Design Parameters Summary :

   ---------------------------

 

   Total # of topology design elements             :      3098

   Total # of topology cards                       :         1

 

   Total Volume of Design Material :   2.1107E+02

     Total Mass of Design Material :   5.6988E-04

     Volume of Non-Design Material :   0.0000E+00

       Mass of Non-Design Material :   0.0000E+00

 

   Solid Design Elements  :  PSOLID

   ---------------------    --------

                               1

 

 

   ---------------------------------

   Optimization Parameters Summary :

   ---------------------------------

 

   Initial Material Fraction [0,1] :   0.5100

   Minimum Element Volume Fraction :   0.0100

   Discreteness Parameter          :   1.0000

 

   Topology Optimization Method    :   Density Method

   Maximum Number of Iterations    :        30

 

   Convergence Tolerance           :   5.0000E-03

   Step Size (Topology)            :   0.5000

 

   Checkerboard Control            :   On (1 - Global Averaging)

 

   Run Type                        :   Topology Optimization

 

 -------------------------------

 Topology Optimization Summary :

 -------------------------------

 

 -------- ----------- ----------- -----------

 DTPL ID    Minimum     Maximum     Minimum  

          Member Size Member Size  Gap Size  

 -------- ----------- ----------- -----------

        1

 -------- ----------- ----------- -----------

 

 -------- ------- ------- ----------- ----------- ----------- -----------

 DTPL ID  Pattern Pattern  Draw Dir.   Stamping     No Hole    Extrusion 

           Repet.  Group. Constraints Constraints Constraints Constraints

 -------- ------- ------- ----------- ----------- ----------- -----------

        1   NONE    NONE      NONE        NONE        NONE        NONE   

 -------- ------- ------- ----------- ----------- ----------- -----------

 

   Restart from previous solution  :   No

   Scratch file directory          : ./

                                     Free space:   340.359 GB

   Number of CPU processors        :          1

 

 

************************************************************************

 

 

 

************************************************************************

 

MEMORY ESTIMATION INFORMATION :

-------------------------------

 

 Solver Type is:  Sparse-Matrix Solver

                  Direct Method

 

 Current Memory (RAM)                                    :     100 MB

   In addition a ramdisk area was allocated in memory    :     200 MB

 Estimated Minimum Memory (RAM) for Out of Core Solution :       6 MB

 Recommended Memory (RAM) for Out of Core Solution       :       6 MB

 Recommended Memory (RAM) for In-Core Solution           :       7 MB

 (Note: The Minimum Memory Requirement is limited by Sensitivity Module.)    

 

DISK SPACE ESTIMATION INFORMATION :

-----------------------------------

 

 Estimated Disk Space for Output Data Files              :       6 MB

 Estimated Scratch Disk Space for In-Core Solution       :       5 MB

 Estimated Scratch Disk Space for Out of Core Solution   :       8 MB

 

************************************************************************

 

 

BEGINNING OPTIMIZATION SOLUTION ....

 

 

************************************************************************

 

OPTIMIZATION HISTORY INFORMATION :

----------------------------------

 

 

ITERATION   0

 

 Element # 2354, element type TETRA.

 WARNING - Outside of recommended range: Face Skew Angle =    75.270    

           upper limit =    75.000    

 WARNING - Outside of recommended range: Face Vertex Angle =    7.5045    

           lower limit =    15.000    

 WARNING - Outside of recommended range: Edge Angle =    80.092    

           upper limit =    75.000    

 

 Element # 2376, element type TETRA.

 WARNING - Outside of recommended range: Face Vertex Angle =    13.291    

           lower limit =    15.000    

 WARNING - Outside of recommended range: Edge Angle =    75.141    

           upper limit =    75.000    

 

 Element # 2399, element type TETRA.

 WARNING - Outside of recommended range: Face Skew Angle =    75.270    

           upper limit =    75.000    

 WARNING - Outside of recommended range: Face Vertex Angle =    7.5045    

           lower limit =    15.000    

 WARNING - Outside of recommended range: Edge Angle =    80.740    

           upper limit =    75.000    

 

 NOTE : other similar error/warning messages were suppressed,

        use PARAM,CHECKEL,FULL to obtain full report

 

 

 Element # 2503, element type TETRA.

 WARNING - Outside of recommended range: Face Skew Angle =    80.714    

           upper limit =    75.000    

 

 Element # 3764, element type TETRA.

 WARNING - Outside of recommended range: Aspect Ratio =    819.11    

           upper limit =    100.00    

 ERROR - Acceptable range violation: Face Aspect Ratio =    729.39    

         upper limit =    500.00    

 ERROR - Acceptable range violation: Face Skew Angle =    89.851    

         upper limit =    85.000    

 ERROR - Acceptable range violation: Face Vertex Angle =   0.74365E-01

         lower limit =    3.0000    

 ERROR - Acceptable range violation: Edge Angle =    89.403    

         upper limit =    87.000    

 

 Element # 3878, element type TETRA.

 ERROR - Acceptable range violation: Edge Angle =    87.104    

         upper limit =    87.000    

 

 Element # 4179, element type TETRA.

 ERROR - Acceptable range violation: Face Skew Angle =    86.790    

         upper limit =    85.000    

 ERROR - Acceptable range violation: Face Vertex Angle =    1.6382    

         lower limit =    3.0000    

 ERROR - Acceptable range violation: Edge Angle =    88.078    

         upper limit =    87.000    

 

 Element # 4245, element type TETRA.

 WARNING - Outside of recommended range: Aspect Ratio =    781.06    

           upper limit =    100.00    

 ERROR - Acceptable range violation: Face Aspect Ratio =    729.39    

         upper limit =    500.00    

 ERROR - Acceptable range violation: Face Skew Angle =    89.851    

         upper limit =    85.000    

 ERROR - Acceptable range violation: Face Vertex Angle =   0.74365E-01

         lower limit =    3.0000    

 

 Element # 4435, element type TETRA.

 WARNING - Outside of recommended range: Face Aspect Ratio =    61.537    

           upper limit =    50.000    

 

 Element # 4875, element type TETRA.

 WARNING - Outside of recommended range: Face Aspect Ratio =    53.548    

           upper limit =    50.000    

 

 Element # 4911, element type TETRA.

 WARNING - Outside of recommended range: Face Aspect Ratio =    84.289    

           upper limit =    50.000    

 

 Element # 5261, element type TETRA.

 WARNING - Outside of recommended range: Aspect Ratio =    104.03    

           upper limit =    100.00    

 

 *** ERROR # 2203 ***

 Error(s) encountered during element check

***** Element Quality Check Failed - error limits violation *****

 

 NOTE : To bypass element quality checks (except essential validity checks)

 use PARAM,CHECKEL,NO. This may, however, cause very poor results.

 

 Element Quality Check Summary

 -----------------------------

 Total # of elements that exceeded acceptable range    (error) =    22

 Total # of elements that exceeded recommended range (warning) =   189

 

 Acceptable range violations:

 ------------------------------------------------------------------------------

 Element     Property          # of     Acceptable Range     Max.  Viol.  Elem.

                               Viol.     Lower     Upper    Value  type    No.

 ------- ------------------- -------- --------- --------- --------- --- -------

 TETRA   Face Skew Angle           20        --     85.00     89.85  U     3764

 TETRA   Edge Angle                19        --     87.00     89.75  U     5431

 TETRA   Face Vertex Angle         21      3.00    177.00      0.07  L     4245

 TETRA   Face Aspect Ratio          2        --    500.00    729.39  U     3764

 

 Recommended range violations:

 ------------------------------------------------------------------------------

 Element     Property          # of     Recommended Range    Max.  Viol.  Elem.

                               Viol.     Lower     Upper    Value  type    No.

 ------- ------------------- -------- --------- --------- --------- --- -------

 TETRA   TETRA Aspect Ratio         7        --    100.00    819.11  U     3764

 TETRA   Face Skew Angle           38        --     75.00     84.49  U     4402

 TETRA   Edge Angle               103        --     75.00     86.82  U     5036

 TETRA   Face Vertex Angle        172     15.00    165.00      3.35  L     4363

 TETRA   Face Aspect Ratio         12        --     50.00    117.47  U     5360

 

 

 *** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

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Guest

Hi,


 


To solve this, you can either remesh the elements or turn off the element quality check.


 


To turn off element quality check, Go to Analysis page>> Control Cards>> PARAM>>CHECKEL>> NO

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