Unable to run Solver

Question

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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Altair Forum User · Answer

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

Altair Forum User · Answer

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.

Altair Forum User · Answer

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.