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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › “Excessive Thickness Change” Error in 2 way FSI › 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.