Altair RISE

A program to recognize and reward our most engaged community members

Nominate Yourself Now!

Unable to run Solver

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.

<?xml version="1.0" encoding="UTF-8"?>

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

Altair Forum User

Here is a better picture

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Can you please post the '.out' and '.stat' file of your FEM problem?

Altair Forum User

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.

Altair Forum User

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

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

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

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

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

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

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

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