Learning Forum

[PiyusHK]

The mesh went well , but while generating the solution it says "~An unknown error occurred during solution. Check the solver Output on the solution Information object for possible causes~". This is for the analysis of a fsae car. Do u have any suggestions regarding the method of analysis , how to proceed further , etc?

[1shan]

,nThere may be multiple reasons for this error message. Please check the solution information and tell us what kind of warnings and error messages you see. Also, I would suggest you replace the damper with the standard spring element in ANSYS and make sure that all the joint and connection are correctly defined by doing a rigid body dynamics analysis first(make all bodies rigid) and then move to transient. nRegards,nIshan.n

[PiyusHK]

Thank you @1shannI have replaced the damper with the standard spring element in Ansys and run the solution in Rigid body dynamics analysis. It was successfully solved without any error then I moved to Transient analysis where I am still getting some errors Text: nThe solver engine was unable to converge on a solution for the nonlinear problem as constrained,n An unconverged solution(identified as a subset 999999 is output for analysis debug purpose. Result at this time should not be used for any other purpose)nIn the solution information I am got this warning please help to understand this warning.n(Below you can find the complete text file of solution information)nn*** WARNING ***                        CP =      7.281  TIME= 16:19:28n Material number 96 (used by element 862939) should normally have at least one MP or one TB type command associated with it. Output of     n energy by material may not be available.                               n n *** WARNING ***                        CP =      7.391  TIME= 16:19:28n No constraints have been defined using the D command.                  n n *** NOTE ***                           CP =      7.484  TIME= 16:19:28n The step data was checked and warning messages were found.             n Please review output or errors file (                                 n \FrontTransient\_ProjectScratch\Scr3A3C\file0.err ) for these        n warning messages. n*** WARNING ***                        CP =     71.312  TIME= 16:20:35n Pivoting has been activated for the Distributed Sparse Matrix Solver . n The memory required may greatly exceed the predicted amount. In that  n event, use the DSPOPTION command to change the memory mode and/or      n memory size used by the Distributed Sparse Matrix Solver.              n curEqn= 422224 totEqn= 483001 Job CP sec=    85.453n     Factor Done= 50% Factor Wall sec=    10.502 rate=   8531.6 Mflopsn curEqn= 482974 totEqn= 483001 Job CP sec=    93.734n     Factor Done= 100% Factor Wall sec=    18.865 rate=   9450.0 Mflopsn curEqn= 483001 totEqn= 483001 Job CP sec=    93.734n     Factor Done= 100% Factor Wall sec=    18.908 rate=   9428.3 Mflopsn Distributed sparse solver maximum pivot= 56792173.2 at node 299564 UY. n Distributed sparse solver minimum pivot= 596.863186 at node 355512 UX. n Distributed sparse solver minimum pivot in absolute value= 596.863186  n at node 355512 UX.                                                     n    DISP CONVERGENCE VALUE  =  163.0     CRITERION=  8.315   n   EQUIL ITER  1 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC=  163.0   n n *** ERROR ***                          CP =     95.359  TIME= 16:21:00n Element 138133 (type = 9, SOLID186) (and maybe other elements) has     n become highly distorted. Excessive distortion of elements is usually  n a symptom indicating the need for corrective action elsewhere. Try    n ramping the load up instead of step applying the load (KBC,1). You    n may need to improve your mesh to obtain elements with better aspect    n ratios. Also consider the behavior of materials, contact pairs,       n and/or constraint equations. Please rule out other root causes of     n this failure before attempting rezoning or nonlinear adaptive          n solutions. If this message appears in the first iteration of first    n substep, be sure to run shape checking of elements.     nArray               n n n n n