Stuck at load step 1

- March 18, 2023 at 1:59 pm
  
  H Nor
  Subscriber
  
  I have a problem of unconstrainted model with error " *** ERROR *** SUPPRESSED MESSAGE CP = 286.375 TIME= 17:51:27
  There are 2 small equation solver pivot terms (e.g., at the UX degree
  of freedom of node 20502). Please check for an insufficiently
  constrained model. "
  This is a half model of interior beam column joint. i am not sure how to fix it.
  
  from the J12_1.out file.
  ***** MAPDL SOLUTION ROUTINE *****
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 10.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . . 5
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 10
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 3408. CRITERION= 85.21
  Process memory allocated for solver = 57.210 MB
  Process memory required for in-core solution = 54.905 MB
  Process memory required for out-of-core solution = 24.003 MB
  *** NOTE *** CP = 4.203 TIME= 21:48:59
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 20.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 134.3 CRITERION= 3.357
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 5.562 TIME= 21:49:01
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 30.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 268.6 CRITERION= 6.715
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 6.719 TIME= 21:49:04
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 40.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 402.9 CRITERION= 10.07
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 7.953 TIME= 21:49:05
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 50.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 537.2 CRITERION= 13.43
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 9.328 TIME= 21:49:07
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 60.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 671.5 CRITERION= 16.79
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 10.547 TIME= 21:49:09
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 70.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 805.8 CRITERION= 20.14
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 11.781 TIME= 21:49:12
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 80.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 940.1 CRITERION= 23.50
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 12.922 TIME= 21:49:13
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  PRINTOUT RESUMED BY /GOP
  PRINTOUT RESUMED BY /GOP
  L O A D S T E P O P T I O N S
  LOAD STEP NUMBER. . . . . . . . . . . . . . . . 1
  TIME AT END OF THE LOAD STEP. . . . . . . . . . 90.000
  AUTOMATIC TIME STEPPING . . . . . . . . . . . . ON
  INITIAL NUMBER OF SUBSTEPS . . . . . . . . .500000
  MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1000000
  MINIMUM NUMBER OF SUBSTEPS . . . . . . . . . 1
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS. . . . 200
  STEP CHANGE BOUNDARY CONDITIONS . . . . . . . . NO
  LINE SEARCH . . . . . . . . . . . . . . . . . . ON
  TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  CONVERGENCE CONTROLS
  LABEL REFERENCE TOLERANCE NORM MINREF
  F 0.000 0.2500E-01 2 0.000
  U 0.000 0.2500 2 0.000
  COPY INTEGRATION POINT VALUES TO NODE . . . . .YES, FOR ELEMENTS WITH
  ACTIVE MAT. NONLINEARITIES
  PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
  DATABASE OUTPUT CONTROLS
  ITEM FREQUENCY COMPONENT
  NSOL -10
  RSOL -10
  NLOA -10
  STRS -10
  EPEL -10
  EPPL -10
  
  FORCE CONVERGENCE VALUE = 1074. CRITERION= 26.86
  Process memory allocated for solver = 55.061 MB
  Process memory required for in-core solution = 52.856 MB
  Process memory required for out-of-core solution = 23.852 MB
  *** NOTE *** CP = 14.094 TIME= 21:49:16
  The Distributed Sparse Matrix Solver is currently running in the
  in-core memory mode. This memory mode uses the most amount of memory
  in order to avoid using the hard drive as much as possible, which most
  often results in the fastest solution time. This mode is recommended
  if enough physical memory is present to accommodate all of the solver
  data.
  FINISH SOLUTION PROCESSING
- March 22, 2023 at 3:32 pm
  
  Chandra Sekaran
  Ansys Employee
  
  May be unconnected to your question but why are you getting load step 1 again and again with increasing time. Are you getting out of /SOLUTION module after the SOLVE command and then getting back in? If you are, you are not continuing the analysis from time 10 to time 20 to time 30. Instead you are solving new at time=10, time=20 etc.
- March 23, 2023 at 2:44 am
  
  mjmiddle
  Ansys Employee
  
  It seems you also have rigid motion, because not enogh constraints. Can you upload the input file or database?
- March 23, 2023 at 6:15 am
  
  H Nor
  Subscriber
  
  Thank you for the replies. What happen was that there was element with wrong nodes, and i have already fixed it. Thankyou for your times.