An unknown error during Solution.

- December 7, 2018 at 5:54 pm
  
  AshishChauhan
  Subscriber
  
  Hello, I'm getting an error and a warning during solution, while all other things are good.
  
  Error: "An unknown error occurred during solution. Check the Solver Output on the Solution Information object for possible causes."
  
  And,
  
  Warning: "Not all Named Selections were successfully written because one or more names are not valid for the solver."
  
  Association: Project>Model>Static Structural>Solution
  
  I'm using Ansys 18.1 and doing an analysis on a layered composite helical spring model generated in Ansys ACP-Pre.
  
  I have also attached a text file containing the Solution Information.
  
  PLEASE HELP!
- December 7, 2018 at 6:42 pm
  
  Sandeep Medikonda
  Ansys Employee
  
  Ashish, Can you copy paste the output using preformatted option in the toolbar above where you type? Not everyone is allowed to download the file? Even the last part after the statistics are written out will do.
  
  Regards,
  Sandeep
- December 7, 2018 at 7:03 pm
  AshishChauhan
  Subscriber
  Hello Sir,
  
  Actually, i saw one post on the forum where the similar error was posted and it mentioned to close some of the other running programs. After closing one of the programs and running the solution again I got rid of the above-mentioned error, but now it shows one more Unknown error.
  
  Also, the Warning: "Not all Named Selections were successfully written because one or more names are not valid for the solver" is still there.
  
  I am pasting the solution information for the second error here.
  
  Solver Output
  
  ANSYS Mechanical
  Enterprise
  
  *
  *
  |
  |
  |   W E L C O M E   T O   T H E   A N S Y S (R) P R O G R A M
  |
  |
  |
  *
  *
  
  ***************************************************************
  *
  ANSYS Release 18.1     LEGAL NOTICES
  *
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  *
  *
  * Copyright 2017 SAS IP, Inc. All rights reserved.           *
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  Release
  18.1
  
  Point Releases and Patches installed:
  
  ANSYS Inc. Products Release 18.1
  ANSYS Mechanical Products Release 18.1
  
  ANSYS Autodyn Release 18.1
  ANSYS LS-DYNA Release 18.1
  ANSYS AIM
  Release 18.1
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  18.1
  
            ***** ANSYS COMMAND LINE ARGUMENTS *****
  BATCH
  MODE REQUESTED (-b)    = NOLIST
  INPUT FILE COPY MODE (-c)    = COPY
  
  DISTRIBUTED MEMORY PARALLEL REQUESTED
         4 PARALLEL PROCESSES REQUESTED
  WITH SINGLE THREAD PER PROCESS
      TOTAL OF     4 CORES REQUESTED
  MPI
  OPTION                   = INTELMPI
  INPUT FILE NAME              =
  C:UsersMAYANKDesktopNAYA MODEL01 (Ansys
  18.1)_ProjectScratchScr9956dummy.dat
  OUTPUT FILE NAME             =
  C:UsersMAYANKDesktopNAYA MODEL01 (Ansys
  18.1)_ProjectScratchScr9956solve.out
  START-UP FILE MODE           =
  NOREAD
  STOP FILE MODE               = NOREAD
  
  RELEASE= Release
  18.1         BUILD= 18.1      UP20170403   VERSION=WINDOWS x64
  CURRENT
  JOBNAME=file0 00:161 DEC 08, 2018 CP=      0.344
  
  PARAMETER
  _DS_PROGRESS =     999.0000000
  
  /INPUT FILE= ds.dat LINE=
  0
  
  *** NOTE ***                            CP =       0.562
  TIME= 00:161
  The /CONFIG,NOELDB command is not valid in a Distributed
  ANSYS
  solution. Command is
  ignored.
  
  *GET _WALLSTRT
  FROM ACTI ITEM=TIME WALL VALUE= 0.275277778
  
  TITLE=
  
  NEW--Static Structural
  (K3)
  
  ACT
  Extensions:
        MechanicalDropTest, 2.0
  
  f0fd899f-9d88-4f46-8cf1-36bf5c218d65, wbex
  
  SET PARAMETER
  DIMENSIONS ON _WB_PROJECTSCRATCH_DIR
  TYPE=STRI DIMENSIONS=
  248        1        1
  
  PARAMETER _WB_PROJECTSCRATCH_DIR(1) =
  C:UsersMAYANKDesktopNAYA MODEL01 (Ansys
  18.1)_ProjectScratchScr9956
  
  SET PARAMETER DIMENSIONS ON
  _WB_SOLVERFILES_DIR
  TYPE=STRI DIMENSIONS=      248        1
  1
  
  PARAMETER _WB_SOLVERFILES_DIR(1) = C:UsersMAYANKDesktopNAYA
  MODEL01 (Ansys 18.1)NEW_filesdp0SYS-5MECH
  
  SET PARAMETER DIMENSIONS
  ON _WB_USERFILES_DIR
  TYPE=STRI DIMENSIONS=      248        1
  1
  
  PARAMETER _WB_USERFILES_DIR(1) = C:UsersMAYANKDesktopNAYA MODEL01
  (Ansys 18.1)NEW_filesuser_files
  --- Data in consistent NMM units. See
  Solving Units in the help system for more
  
  MPA UNITS SPECIFIED FOR
  INTERNAL
  LENGTH      = MILLIMETERS (mm)
  MASS        = TONNE
  (Mg)
  TIME        = SECONDS (sec)
  TEMPERATURE = CELSIUS (C)
  
  TOFFSET     = 273.0
  FORCE       = NEWTON (N)
  HEAT        = MILLIJOULES
  (mJ)
  
  INPUT UNITS ARE ALSO SET TO MPA
  
  *** ANSYS - ENGINEERING
  ANALYSIS SYSTEM RELEASE Release 18.1     18.1     ***
  DISTRIBUTED ANSYS
  Mechanical Enterprise
  
  00000000 VERSION=WINDOWS
  x64   00:161 DEC 08, 2018 CP=      0.562
  
  NEW--Static Structural
  (K3)
  
  
  ***** ANSYS ANALYSIS DEFINITION (PREP7) *****
  *********** Nodes for the
  whole assembly ***********
  *********** Elements for Body 1 "SolidModel.1"
  ***********
  *********** Send User Defined Coordinate System(s)
  ***********
  *********** Set Reference Temperature
  ***********
  *********** Send Materials ***********
  *********** Sending
  Coordinate Systems for External Layered Section***********
  ***********
  Sending Materials for External Layered Section***********
  *********** Send
  External Layered Section Properties ***********
  *********** Send Named
  Selection as Node Component ***********
  *********** Send Named Selection as
  Node Component ***********
  *********** Send Named Selection as Node
  Component ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Send Named Selection as Node Component
  ***********
  *********** Fixed Supports ***********
  *********** Define
  Force Using Surface Effect Elements ***********
  
  ***** ROUTINE
  COMPLETED ***** CP =        29.469
  
  --- Number of total nodes =
  1695840
  --- Number of contact elements = 8488
  --- Number of spring
  elements = 0
  --- Number of bearing elements = 0
  --- Number of solid
  elements = 1526112
  --- Number of condensed parts = 0
  --- Number of total
  elements = 1534600
  
  *GET _WALLBSOL FROM ACTI ITEM=TIME WALL VALUE=
  0.282777778
  
  ****************************************************************************
  *************************
  SOLUTION
  ********************************
  ****************************************************************************
  
  *****
  ANSYS SOLUTION ROUTINE *****
  
  PERFORM A STATIC ANALYSIS
  THIS
  WILL BE A NEW ANALYSIS
  
  LARGE DEFORMATION ANALYSIS
  
  USE
  PRECONDITIONED CONJUGATE GRADIENT SOLVER
  CONVERGENCE TOLERANCE =
  1.00000E-08
  MAXIMUM ITERATION     = NumNode*DofPerNode* 1.0000
  
  MEMORY SAVING OPTION TURNED ON FOR PCG SOLVER
  
  CONTACT
  INFORMATION PRINTOUT LEVEL       1
  
  DO NOT COMBINE ELEMENT MATRIX FILES
  (.emat) AFTER DISTRIBUTED PARALLEL SOLUTION
  
  DO NOT COMBINE ELEMENT SAVE
  DATA FILES (.esav) AFTER DISTRIBUTED PARALLEL SOLUTION
  
  NLDIAG: Nonlinear
  diagnostics CONT option is set to ON.
           Writing frequency : each
  ITERATION.
  
  DEFINE RESTART CONTROL FOR LOADSTEP LAST
  AT FREQUENCY OF
  LAST AND NUMBER FOR OVERWRITE IS    0
  
  DELETE RESTART FILES OF
  ENDSTEP
  ****************************************************
  *******************
  SOLVE FOR LS 1 OF 1 ****************
  
  SELECT       FOR ITEM=TYPE
  COMPONENT=
  IN RANGE        13 TO         13 STEP
  1
  
         8488 ELEMENTS (OF    1534600 DEFINED) SELECTED BY ESEL
  COMMAND.
  
  SELECT      ALL NODES HAVING ANY ELEMENT IN ELEMENT
  SET.
  
       9558 NODES (OF 1695840 DEFINED) SELECTED FROM
       8488
  SELECTED ELEMENTS BY NSLE COMMAND.
  
  SPECIFIED SURFACE LOAD PRES FOR ALL
  SELECTED ELEMENTS LKEY = 1   KVAL = 1
        SET ACCORDING TO TABLE
  PARAMETER = _LOADVARI87X
  
  SPECIFIED SURFACE LOAD PRES
  FOR ALL SELECTED ELEMENTS LKEY = 2   KVAL = 1
        SET ACCORDING TO TABLE
  PARAMETER = _LOADVARI87Y
  
  SPECIFIED SURFACE LOAD PRES
  FOR ALL SELECTED ELEMENTS LKEY = 3   KVAL = 1
        SET ACCORDING TO TABLE
  PARAMETER = _LOADVARI87Z
  
  ALL SELECT   FOR ITEM=NODE
  COMPONENT=
  IN RANGE         1 TO    1865424 STEP          1
  
  
  1695840 NODES (OF    1695840 DEFINED) SELECTED BY NSEL COMMAND.
  
  ALL
  SELECT   FOR ITEM=ELEM COMPONENT=
  IN RANGE         1 TO    1704168
  STEP          1
  
      1534600 ELEMENTS (OF    1534600 DEFINED) SELECTED
  BY ESEL COMMAND.
  
  PRINTOUT RESUMED BY /GOP
  
  USE AUTOMATIC TIME
  STEPPING THIS LOAD STEP
  
  USE       1 SUBSTEPS INITIALLY THIS LOAD STEP
  FOR ALL DEGREES OF FREEDOM
  FOR AUTOMATIC TIME STEPPING:
     USE     10
  SUBSTEPS AS A MAXIMUM
     USE      1 SUBSTEPS AS A MINIMUM
  
  TIME=
  1.0000
  
  ERASE THE CURRENT DATABASE OUTPUT CONTROL
  TABLE.
  
  WRITE ALL ITEMS TO THE DATABASE WITH A FREQUENCY OF
  NONE
     FOR ALL APPLICABLE ENTITIES
  
  WRITE NSOL ITEMS TO THE DATABASE
  WITH A FREQUENCY OF ALL
     FOR ALL APPLICABLE ENTITIES
  
  WRITE RSOL
  ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
     FOR ALL APPLICABLE
  ENTITIES
  
  WRITE STRS ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
  
  FOR ALL APPLICABLE ENTITIES
  
  WRITE EPEL ITEMS TO THE DATABASE WITH A
  FREQUENCY OF ALL
     FOR ALL APPLICABLE ENTITIES
  
  WRITE EPPL ITEMS TO
  THE DATABASE WITH A FREQUENCY OF ALL
     FOR ALL APPLICABLE
  ENTITIES
  
  NONLINEAR STABILIZATION CONTROL:
  KEY=OFF
  
  *GET
  ANSINTER_ FROM ACTI ITEM=INT        VALUE= 0.00000000
  
  *IF
  ANSINTER_                         ( =   0.00000     ) NE
  
  0                                 ( =   0.00000     ) THEN
  
  *ENDIF
  
  ***** ANSYS SOLVE    COMMAND *****
  
  *** WARNING
  ***                         CP =      30.422   TIME= 00:16:58
  Element shape
  checking is currently inactive. Issue SHPP,ON or
  SHPP,WARN to
  reactivate, if desired.
  
  *** NOTE
  ***                            CP =      71.734   TIME= 00:17:12
  The model
  data was checked and warning messages were found.
  Please
  review output or errors file ( C:UsersMAYANKDesktopNAYA
  MODEL01
  (Ansys 18.1)_ProjectScratchScr9956file0.err ) for these
  warning
  messages.
  
  ***
  SELECTION OF ELEMENT TECHNOLOGIES FOR APPLICABLE ELEMENTS ***
        --- GIVE
  SUGGESTIONS AND RESET THE KEY OPTIONS ---
  
  ELEMENT TYPE    1 IS SOLID185.
  IT IS ASSOCIATED WITH LINEAR MATERIALS ONLY
  BUT MATERIALS ARE ANISOTROPIC.
  KEYOPT(2)=2 IS SUGGESTED AND HAS BEEN RESET.
  KEYOPT(1-12)=    0    2
  1    0    0    0    0    1    0    0    0    0
  
  *** ANSYS -
  ENGINEERING ANALYSIS SYSTEM RELEASE Release 18.1     18.1
  ***
  DISTRIBUTED ANSYS Mechanical Enterprise
  
  00000000 VERSION=WINDOWS x64   00:17:14 DEC 08, 2018 CP=
  73.094
  
  NEW--Static Structural
  (K3)
  
                         S O L U T I O N   O P T I O N S
  
  
  PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D
  
  DEGREES OF FREEDOM. . . . . . UX   UY   UZ
     ANALYSIS TYPE . . . . . . . .
  . . . . . . . . .STATIC (STEADY-STATE)
     OFFSET TEMPERATURE FROM ABSOLUTE
  ZERO . . . . . 273.15
     NONLINEAR GEOMETRIC EFFECTS . . . . . . . . .
  .ON
     EQUATION SOLVER OPTION. . . . . . . . . . . . .PCG
  
        MEMORY SAVING OPTION. . . . . . . . . . . .ON
        TOLERANCE. . .
  . . . . . . . . . . . . . . . 1.00000E-08
     NEWTON-RAPHSON OPTION . . . . .
  . . . . . . . .PROGRAM CHOSEN
     GLOBALLY ASSEMBLED MATRIX . . . . . . . .
  . . .SYMMETRIC
  
  *** NOTE ***                            CP =
  73.531   TIME= 00:17:14
  Poisson's ratio PR input has been converted to NU
  input.
  
  *** WARNING ***                         CP =
  74.609   TIME= 00:17:15
  Material number 13 (used by element 1695681 ) should
  normally have at
  least one MP or one TB type command associated with it.
  Output of
  energy by material may not be
  available.
  
  *** NOTE
  ***                            CP =      75.484   TIME= 00:17:16
  The step
  data was checked and warning messages were found.
  Please
  review output or errors file ( C:UsersMAYANKDesktopNAYA
  MODEL01
  (Ansys 18.1)_ProjectScratchScr9956file0.err ) for these
  warning
  messages.
  
  ***
  NOTE ***                            CP =      75.484   TIME= 00:17:16
  This
  nonlinear analysis defaults to using the full Newton-Raphson
  solution
  procedure. This can be modified using the NROPT command.
  
  *** NOTE
  ***                            CP =      75.484   TIME= 00:17:16
  The
  conditions for direct assembly have been met. No .emat or .erot
  files
  will be produced.
  
       D I S T R I B U T E D   D O M A I N   D E C O M P O S E R
  
  ...Number of elements: 1534600
  ...Number of nodes:    1695840
  
  ...Decompose to 4 CPU domains
  ...Element load balance ratio =
  1.017
  
                        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. . . . . . . . . . 1.0000
     AUTOMATIC TIME
  STEPPING . . . . . . . . . . . .    ON
        INITIAL NUMBER OF SUBSTEPS . . .
  . . . . . .     1
        MAXIMUM NUMBER OF SUBSTEPS . . . . . . . . .
  10
        MINIMUM NUMBER OF SUBSTEPS . . . . . . . . .     1
     MAXIMUM
  NUMBER OF EQUILIBRIUM ITERATIONS. . . .    15
     STEP CHANGE BOUNDARY
  CONDITIONS . . . . . . . .    NO
     STRESS-STIFFENING . . . . . . . . . . . .
  . . .    ON
     TERMINATE ANALYSIS IF NOT CONVERGED . . . . . .YES (EXIT)
  
     CONVERGENCE CONTROLS. . . . . . . . . . . . . .USE DEFAULTS
     PRINT
  OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
     DATABASE OUTPUT
  CONTROLS
        ITEM     FREQUENCY   COMPONENT
         ALL
  NONE
        NSOL        ALL
        RSOL
  ALL
        STRS        ALL
        EPEL
  ALL
        EPPL        ALL
  
  SOLUTION
  MONITORING INFO IS WRITTEN TO FILE=
  file.mntr
  
  MAXIMUM NUMBER OF EQUILIBRIUM ITERATIONS HAS BEEN MODIFIED
  
  TO BE, NEQIT = 22, BY SOLUTION CONTROL LOGIC.
  
  *** NOTE ***                            CP =      91.141   TIME=
  00:170
  The PCG solver has automatically set the level of difficulty for
  this
  model to
  4.
  
  ***
  WARNING ***                         CP =     151.609   TIME= 00:19:24
  An
  error has occurred writing to the file = 3 which may imply a full
  
  disk.
  
  The system I/O error = 28. Please refer to your system documentation
  
  on I/O errors.
```
 
```
- December 7, 2018 at 9:59 pm
  
  Sandeep Medikonda
  Ansys Employee
  
  Ashish, it looks like you have a full disk. Make some space and also based on some of the warnings, you might want to turn off distributed solve and run. See this post.
  
  The comment about named selection seems like a warning to me and doesn't seem to be the problem Right click on that message and identify the object that is creating the problem. See what is wrong in the naming of it and correct it.
  
  Regards,
  Sandeep
  Guidelines on the Student Community
- December 8, 2018 at 7:31 am
  
  AshishChauhan
  Subscriber
  
  Hello sir
  I checked my disk space while solution was running and it was getting full , as you said.
  And, after increasing my disk space, the solution ran fine.
  
  Thank you for the help.
- June 6, 2019 at 5:22 pm
  
  Goddy
  Subscriber
  
  I know I'm not supposed to do this but I put up a question a couple of days ago and no one has responded. So maybe doing this can draw your attention this link will take you to the post /forum/forums/topic/unknown-error-the-optimization-run-was-terminated-check-the-optimization-output/
  
  Thanks