Sebastianchi
Subscriber

Hi Peter, 
Am facing some issues with my solution converging.

I have tried the following steps:
Decreasing Minimum, maxium time steps in analysis settings, trying with both tetrahederal and hexagonal meshes.
I have also increased NEQIT from 26 to 100, but to no avail. the solution always gets stuck in this time step.

This is the solution information log for your reference.
It seems the the criterion constantly stuck at 0.1160 at a specific timestep and unable to decrease below it.

*** LOAD STEP     2   SUBSTEP    31  COMPLETED.    CUM ITER =    426
 *** TIME =   1.62000         TIME INC =  0.200000E-01
 *** RESPONSE FREQ = 0.9318       PERIOD=   1.073      PTS/CYC =  54.   
 *** AUTO STEP TIME:  NEXT TIME INC = 0.20000E-01  UNCHANGED

     FORCE CONVERGENCE VALUE  =  0.1246E+07  CRITERION=   6355.   
     DISP CONVERGENCE VALUE   =  0.1400      CRITERION=  0.7143E-02
    EQUIL ITER   1 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.1400   
     DISP CONVERGENCE VALUE   =  0.1400      CRITERION=  0.7289E-02
     LINE SEARCH PARAMETER =   1.000     SCALED MAX DOF INC = -0.1400   
     FORCE CONVERGENCE VALUE  =   18.72      CRITERION=  0.4202E-02
    EQUIL ITER   2 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC=  0.4462E-01
     DISP CONVERGENCE VALUE   =  0.1685E-01  CRITERION=  0.7437E-02
     LINE SEARCH PARAMETER =  0.3776     SCALED MAX DOF INC =  0.1685E-01
     FORCE CONVERGENCE VALUE  =   12.92      CRITERION=  0.2665E-02
    EQUIL ITER   3 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.6337E-02


[Edit: removed middle section of output.]

    EQUIL ITER  98 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC= -0.2490E-02
     DISP CONVERGENCE VALUE   =  0.2625E-03  CRITERION=  0.1160E-01 <<< CONVERGED
     LINE SEARCH PARAMETER =  0.1054     SCALED MAX DOF INC = -0.2625E-03
     FORCE CONVERGENCE VALUE  =  0.5429E-01  CRITERION=  0.3895E-02
    EQUIL ITER  99 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC=  0.4155E-03
     DISP CONVERGENCE VALUE   =  0.2223E-03  CRITERION=  0.1160E-01 <<< CONVERGED
     LINE SEARCH PARAMETER =  0.5351     SCALED MAX DOF INC =  0.2223E-03
     FORCE CONVERGENCE VALUE  =  0.2846E-01  CRITERION=  0.3900E-02
    EQUIL ITER 100 COMPLETED.  NEW TRIANG MATRIX.  MAX DOF INC=  0.6080E-03
     DISP CONVERGENCE VALUE   =  0.6080E-03  CRITERION=  0.1160E-01 <<< CONVERGED
     LINE SEARCH PARAMETER =   1.000     SCALED MAX DOF INC =  0.6080E-03
     FORCE CONVERGENCE VALUE  =  0.2411E-01  CRITERION=  0.3770E-02

*** ERROR ***                           CP =    2418.594   TIME= 15:11:01
 Solution not converged at time 1.64 (load step 2 substep 32).          
  Run terminated.