Learning Forum

[jkl6588]

 

not entirely sure what happened. was trying to follow this tutorial (Thermo-Structural Analysis of a Brake Using Ansys Mechanical - Lesson 3, Part 1) as closely as possible (barring the rotor acceleration curve) and the software simply would not run...

any help/ advice?

[harrygross616]

It sounds like the issue could be with the setup or compatibility of your inputs. Double-check the boundary conditions, material properties, and meshing to ensure everything aligns with the tutorial. If the rotor acceleration curve was skipped or modified, it might be affecting the simulation. 

retro bowl

[jkl6588]

Thanks for replying @Harrygross616.
I've gotten to the point where I've smoothed out what are most of the error messages, but am left with just these errors:

 

 *** WARNING ***                         CP =       2.380   TIME= 02:42:26

 Material property ALPX of material 3 is evaluated at a temperature of   

 22, which is below the supplied temperature range.  Temperature range   

 checking terminates.                                                    

 

 *** WARNING ***                         CP =       7.319   TIME= 02:42:27

 The Memory_Option on the DSPOPTION command for the distributed sparse   

 solver should be either DEFAULT, INCORE, OUTOFOCORE or FORCE.  This     

 field is reset to DEFAULT.                                              

 

 *** WARNING ***                         CP =       9.234   TIME= 02:42:28

 Element shape checking is currently inactive.  Issue SHPP,ON or         

 SHPP,WARN to reactivate, if desired.                                    

 

 *** WARNING ***                         CP =      29.018   TIME= 02:42:36

 Contact element 360581 is missing DOF TEMP (and possibly others) of     

 underlying base element 48108.  Similar mismatches may exist            

 elsewhere, but checking for this is discontinued.                       

 

 *** WARNING ***                         CP =      67.411   TIME= 02:42:56

 For element 220842 the element connectivity is 0 and 286092.  The node  

 which is identified as a 0 will be a grounded node.                     

 

 *** WARNING ***                         CP =      95.564   TIME= 02:43:04

 Coefficient ratio exceeds 1.0e8 - Check results.                        

 

 *** WARNING ***                         CP =     120.530   TIME= 02:43:25

 Pivoting has been activated for the Sparse Matrix Solver .  The memory  

 required may greatly exceed the predicted amount.  In that event, use   

 the DSPOPTION command to change the memory mode and/or memory size      

 used by the Sparse Matrix Solver.                                       
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I am not entirely sure just how to find these specific elements that seem to be grounded or don't have their thermal DOF turned on (although both of my frictional contacts have them as per the tutorial).
The other very worrying thing is the ground node, definitely should not be fixed at all anywhere...

 

my mesh solution asdp already has dspoption,,high -- so its probably the two elements causing the matrix to be very sparse and fail.