Issue with CNVTOL command

[Dave442]

Hi all,

I am trying to figure out the CNVTOL command for defining convergence criteria and am having some strange results.

I have a solution that solves ok with default solution settings (SOLCONTROL,ON). The solution features nonlinear materials and contact so according to the help file the only convergence check is on the out-of-balance forces.

However, if I define convergence criteria explicitly using the default settings given in the help file (CNVTOL,F,,0.005,2,0.01) and run the solution again, the force convergence criterions shown in the output file are different to those I observe when using the default solution controls. For example

Using Default Solution Settings (SOLCONTROL,ON):

EQUIL ITER 3 COMPLETED. MAX DOF INC = 0.8968E-07
FORCE CONVERGENCE VALUE = 0.6312E-03 CRITERION = 0.6607E-04
EQUIL ITER 4 COMPLETED. MAX DOF INC = 0.5462E-07
FORCE CONVERGENCE VALUE = 0.1934E-03 CRITERION = 0.5792E-04
EQUIL ITER 5 COMPLETED. MAX DOF INC = 0.1928E-07
FORCE CONVERGENCE VALUE = 0.4422E-04 CRITERION = 0.5803E-04
>>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION 5

Using Default Solution Settings (SOLCONTROL,ON) and explicitly stating default convergence criteria (CNVTOL,F,,0.005,2,0.01):

EQUIL ITER 3 COMPLETED. MAX DOF INC = 0.8968E-07
FORCE CONVERGENCE VALUE = 0.6312E-03 CRITERION = 0.6094E-04
EQUIL ITER 4 COMPLETED. MAX DOF INC = 0.5462E-07
FORCE CONVERGENCE VALUE = 0.1934E-03 CRITERION = 0.5235E-04
EQUIL ITER 5 COMPLETED. MAX DOF INC = 0.1928E-07
FORCE CONVERGENCE VALUE = 0.4422E-04 CRITERION = 0.5141E-04
>>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION 5

Why is it that the criterions are different to those using the default settings? Is there some additional convergence criteria that is adjusted with SOLCONTROL,ON?

Also, is it possible at all to output the program-calculated solution controls that have been set using the SOLCONTROL,ON command for a specific analysis?

Many thanks,
Dave