Reply To: “Excessive Thickness Change” Error in 2 way FSI

July 10, 2024 at 2:53 pm

Farah

Subscriber

Hi Rahul,

I have tried different elements that are less susceptible to distortion. I checked the materials, and in the papers, they have all defined these properties for the wall, but I still receive an error.

*** ERROR *** CP = 74.062 TIME= 10:32:17
Element 3909 has excessive thickness change.

There are four warnings that I will list below, but honestly, I don't know which part I'm missing. I am just trying a simple FEA to see if it can pass.

*** WARNING *** CP = 1.328 TIME= 10:31:05
Element shape checking is currently inactive. Issue SHPP,ON or
SHPP,WARN to reactivate, if desired.

*** WARNING ***                         CP =       1.578   TIME= 10:31:05
Material number 2 (used by element 8668) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.

*** WARNING ***                         CP =       4.875   TIME= 10:31:07
A reference moment value times the tolerance is used by the
Newton-Raphson method for checking convergence. The calculated
reference MOMENT CONVERGENCE VALUE = 2.228180446E-06 is less than a
threshold. This threshold is internally calculated. You can
overwrite it by specifying MINREF on the CNVTOL command. Check
results carefully.
     DISP CONVERGENCE VALUE   = 0.2255E-05 CRITERION= 0.5135E-05 <<< CONVERGED
    EQUIL ITER   2 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 0.3668E-03
     FORCE CONVERGENCE VALUE = 0.8002E-06 CRITERION= 0.5000E-04 <<< CONVERGED
     MOMENT CONVERGENCE VALUE = 0.1027E-08 CRITERION= 0.5000E-04 <<< CONVERGED
    >>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION   2

*** WARNING ***                         CP =      74.062   TIME= 10:32:17
The unconverged solution (identified as time 1 substep 999999) is
output for analysis debug purposes. Results should not be used for
any other purpose.

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