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General Mechanical

General Mechanical

Topics related to Mechanical Enterprise, Motion, Additive Print and more.

An error occurred inside the SOLVER module: Enclosure type

    • Rishi Yadav
      Subscriber

      I am trying to simulate the transient heat analysis, but I am getting an error, 'An error occurred inside the SOLVER module: Enclosure type Perfect was incorrectly chosen in some Surface to Surface Radiation objects'

      The initial temperatures are 1400 C, and 300 C for different parts. Had heat flux as heating source and radiation data. Since inside the chamber is vacuum, so I choose surface to surface radiation and chose enclosure type as perfect. I am not sure, why there is an error. Please guide.

    • Sampat Kumar
      Ansys Employee

      Hi 
      Will you please try to open the solver output file and let me what is the actual error message there? Is there any shell body in the model? 

      Best Regards,
      Sampat

       

    • Rishi Yadav
      Subscriber

      Solver Output

       Ansys Mechanical Enterprise Academic Research    


       *------------------------------------------------------------------*
       |                                                                  |
       |   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     |
       |                                                                  |
       *------------------------------------------------------------------*




       ***************************************************************
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       Parasolid Geometry Interface  2023 R1  
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                *****  MAPDL COMMAND LINE ARGUMENTS  *****
        BATCH MODE REQUESTED (-b)    = NOLIST
        INPUT FILE COPY MODE (-c)    = COPY
        SHARED MEMORY PARALLEL REQUESTED
          SINGLE PROCESS WITH  24 THREADS REQUESTED
          TOTAL OF    24 CORES REQUESTED
        INPUT FILE NAME              = D:\Ansys Rishi\Ansys Simulations\5\_ProjectScratch\ScrD250\dummy.dat
        OUTPUT FILE NAME             = D:\Ansys Rishi\Ansys Simulations\5\_ProjectScratch\ScrD250\solve.out
        START-UP FILE MODE           = NOREAD
        STOP FILE MODE               = NOREAD

       RELEASE= 2023 R1              BUILD= 23.1      UP20221128   VERSION=WINDOWS x64
       CURRENT JOBNAME=file  13:22:18  JUL 19, 2024 CP=      0.125


       PARAMETER _DS_PROGRESS =     999.0000000   

       /INPUT FILE= ds.dat  LINE=       0



       DO NOT WRITE ELEMENT RESULTS INTO DATABASE

       *GET  _WALLSTRT  FROM  ACTI  ITEM=TIME WALL  VALUE=  13.3716667   

       TITLE=
       5--Transient Thermal (C5)                                                    

        ACT Extensions:
            LSDYNA, 2023.1
            5f463412-bd3e-484b-87e7-cbc0a665e474, wbex
       /COM,     AdditiveWizard, 2023.1
            d670da30-b684-4a76-8cae-363c855c1121, wbex
       /COM,     ANSYSMotion, 2023.1
            20180725-3f81-49eb-9f31-41364844c769, wbex
       

       SET PARAMETER DIMENSIONS ON  _WB_PROJECTSCRATCH_DIR
        TYPE=STRI  DIMENSIONS=      248        1        1

       PARAMETER _WB_PROJECTSCRATCH_DIR(1) = D:\Ansys Rishi\Ansys Simulations\5\_ProjectScratch\ScrD250\

       SET PARAMETER DIMENSIONS ON  _WB_SOLVERFILES_DIR
        TYPE=STRI  DIMENSIONS=      248        1        1

       PARAMETER _WB_SOLVERFILES_DIR(1) = D:\Ansys Rishi\Ansys Simulations\5\5_files\dp0\SYS-2\MECH\

       SET PARAMETER DIMENSIONS ON  _WB_USERFILES_DIR
        TYPE=STRI  DIMENSIONS=      248        1        1

       PARAMETER _WB_USERFILES_DIR(1) = D:\Ansys Rishi\Ansys Simulations\5\5_files\user_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

       *** MAPDL - ENGINEERING ANALYSIS SYSTEM  RELEASE 2023 R1          23.1     ***
       Ansys Mechanical Enterprise Academic Research    
       00214406  VERSION=WINDOWS x64   13:22:18  JUL 19, 2024 CP=      0.234

       5--Transient Thermal (C5)                                                    



                ***** MAPDL ANALYSIS DEFINITION (PREP7) *****
       *********** Nodes for the whole assembly ***********
       *********** Elements for Body 1 "Q10_Build_Table_(Rounded corners)" ***********
       *********** Elements for Body 2 "Q10_tungsten_Disk" ***********
       *********** Elements for Body 3 "powder layer" ***********
       *********** Elements for Body 4 "Q10_powder_spread-1" ***********
       *********** Elements for Body 5 "Q10_complete heat shield" ***********
       *********** Send User Defined Coordinate System(s) ***********
       *********** Send Materials ***********

       *** WARNING ***                         CP =       6.922   TIME= 13:22:19
       The temperature-dependent secant coefficient of thermal expansion for  
       material 1 includes a temperature point of reference temperature (with 
       a tolerance of 1 degree).  This data is ignored for the MPAMOD command 
       operation to avoid a numerical singularity.                            

       *** WARNING ***                         CP =       6.922   TIME= 13:22:19
       The temperature-dependent secant coefficient of thermal expansion for  
       material 5 includes a temperature point of reference temperature (with 
       a tolerance of 1 degree).  This data is ignored for the MPAMOD command 
       operation to avoid a numerical singularity.                            
       *********** Create Contact "Contact Region" ***********
                   Real Constant Set For Above Contact Is 7 & 6
       *********** Create Contact "Contact Region 3" ***********
                   Real Constant Set For Above Contact Is 9 & 8
       *********** Create Contact "Contact Region 4" ***********
                   Real Constant Set For Above Contact Is 11 & 10
       *********** Create Contact "Contact Region 5" ***********
                   Real Constant Set For Above Contact Is 13 & 12
       *********** Define Temperature Constraint ***********
       *********** Define Temperature Constraint ***********
       *********** Define Temperature Constraint ***********
       *********** Create "Heat Flux" ***********
       *********** Create "ToSurface(Closed)" Radiation ***********
       *********** Create "ToSurface(Closed)" Radiation ***********
       ***************** Define Uniform Initial temperature ***************


       ***** ROUTINE COMPLETED *****  CP =         8.422


       --- Number of total nodes = 104159
       --- Number of contact elements = 3805
       --- Number of spring elements = 0
       --- Number of bearing elements = 0
       --- Number of solid elements = 49733
       --- Number of condensed parts = 0
       --- Number of total elements = 53538

       *GET  _WALLBSOL  FROM  ACTI  ITEM=TIME WALL  VALUE=  13.3719444   
       ****************************************************************************
       *************************    SOLUTION       ********************************
       ****************************************************************************

       *****  MAPDL SOLUTION ROUTINE  *****


       PERFORM A TRANSIENT ANALYSIS
        THIS WILL BE A NEW ANALYSIS

       STEP BOUNDARY CONDITION KEY= 1

       CONTACT INFORMATION PRINTOUT LEVEL       1

       DO NOT SAVE ANY RESTART FILES AT ALL

       Use Full Nonlinear Thermal Transient Solution

       NLHIST: ADDED NODAL RESULTS HISTORY FOR:
             NAME = MAX_TEMP                       
        ITEM/COMP = TEMPMAX
             NODE =         0

       NLHIST: ADDED NODAL RESULTS HISTORY FOR:
             NAME = MIN_TEMP                       
        ITEM/COMP = TEMPMIN
             NODE =         0
       ********* Initial Time Increment Check And Fourier Modulus *********
        Specified Initial Time Increment: 0.1
        Estimated Increment Needed, le*le/alpha, Body 1: 7.4608
        Estimated Increment Needed, le*le/alpha, Body 2: 0.543679
        Estimated Increment Needed, le*le/alpha, Body 3: 0.0288621
        Estimated Increment Needed, le*le/alpha, Body 4: 2.24448
        Estimated Increment Needed, le*le/alpha, Body 5: 0.98259
       ****************************************************
       ******************* SOLVE FOR LS 1 OF 1 ****************

       SPECIFIED CONSTRAINT TEMP FOR PICKED NODES
       REAL=  1400.00000       IMAG=  0.00000000   

       SPECIFIED CONSTRAINT TEMP FOR PICKED NODES
       REAL=  300.000000       IMAG=  0.00000000   

       SPECIFIED CONSTRAINT TEMP FOR PICKED NODES
       REAL=  300.000000       IMAG=  0.00000000   

       SELECT       FOR ITEM=TYPE COMPONENT=   
        IN RANGE        14 TO         14 STEP          1

               53  ELEMENTS (OF      53538  DEFINED) SELECTED BY  ESEL  COMMAND.

       SELECT      ALL NODES HAVING ANY ELEMENT IN ELEMENT SET.

              182 NODES (OF     104159  DEFINED) SELECTED FROM
             53 SELECTED ELEMENTS BY NSLE COMMAND.

       GENERATE SURFACE LOAD HFLU ON SURFACE DEFINED BY ALL SELECTED NODES
       ACCORDING TO TABLE PARAMETER = _LOADVARI75

       NUMBER OF HFLU ELEMENT FACE LOADS STORED =         53

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     104159 STEP          1

           104159  NODES (OF     104159  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO      86886 STEP          1

            53538  ELEMENTS (OF      53538  DEFINED) SELECTED BY  ESEL  COMMAND.

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 6   KVAL = 1
       ACCORDING TO TABLE PARAMETER = _RADVARI65                     

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 6   KVAL = 2
           VALUES =     1.0000         1.0000         1.0000         1.0000   

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     104159 STEP          1

           104159  NODES (OF     104159  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO      86886 STEP          1

            53538  ELEMENTS (OF      53538  DEFINED) SELECTED BY  ESEL  COMMAND.

       ENCLOSURE=  1 VIEWFACTOR SCALE METHOD =  1
                     ITERATIONS =  100
                     TOLERANCE = 1.000000047E-03

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 1   KVAL = 1
       ACCORDING TO TABLE PARAMETER = _RADVARI79                     

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 1   KVAL = 2
           VALUES =     1.0000         1.0000         1.0000         1.0000   

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 2   KVAL = 1
       ACCORDING TO TABLE PARAMETER = _RADVARI79                     

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 2   KVAL = 2
           VALUES =     1.0000         1.0000         1.0000         1.0000   

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 3   KVAL = 1
       ACCORDING TO TABLE PARAMETER = _RADVARI79                     

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 3   KVAL = 2
           VALUES =     1.0000         1.0000         1.0000         1.0000   

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 4   KVAL = 1
       ACCORDING TO TABLE PARAMETER = _RADVARI79                     

       SPECIFIED SURFACE LOAD RDSF FOR ALL PICKED ELEMENTS  LKEY = 4   KVAL = 2
           VALUES =     1.0000         1.0000         1.0000         1.0000   

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     104159 STEP          1

           104159  NODES (OF     104159  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO      86886 STEP          1

            53538  ELEMENTS (OF      53538  DEFINED) SELECTED BY  ESEL  COMMAND.

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     104159 STEP          1

           104159  NODES (OF     104159  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO      86886 STEP          1

            53538  ELEMENTS (OF      53538  DEFINED) SELECTED BY  ESEL  COMMAND.

       PRINTOUT RESUMED BY /GOP

       DO NOT USE AUTOMATIC TIME STEPPING THIS LOAD STEP

       USE INITIAL TIME STEP SIZE OF 0.1000000     FOR ALL  DEGREES OF FREEDOM
       FOR AUTOMATIC TIME STEPPING:
         USE 0.1000000     AS THE MINIMUM TIME STEP SIZE
         USE 0.1000000     AS THE MAXIMUM TIME STEP SIZE

       TIME=  200.00   

       INCLUDE TRANSIENT EFFECTS FOR  ALL DEGREES OF FREEDOM THIS LOAD STEP

       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 EANG ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
         FOR ALL APPLICABLE ENTITIES

       WRITE VENG ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
         FOR ALL APPLICABLE ENTITIES

       WRITE FFLU ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
         FOR ALL APPLICABLE ENTITIES

       WRITE CONT ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
         FOR ALL APPLICABLE ENTITIES

       WRITE MISC ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL
         FOR ALL APPLICABLE ENTITIES

       CONVERGENCE ON HEAT BASED ON THE NORM OF THE N-R LOAD
         WITH A TOLERANCE OF 0.1000E-03 AND A MINIMUM REFERENCE VALUE OF 0.1000E-02
         USING THE L2 NORM (CHECK THE SRSS VALUE)

       UNDER RELAXATION FOR RADIATION FLUX=   0.10000

       TOLERENCE FOR RADIOSITY FLUX=   0.00010

       USING JACOBI ITERATIVE SOLVER FOR RADIOSITY SOLUTION
       FOR 3D ENCLOSURES.
       USING GSEIDEL ITERATIVE SOLVER FOR RADIOSITY SOLUTION
       FOR 2D ENCLOSURES.

       MAXIMUM NUMBER OF ITERATIONS=  1000
       TOLERENCE FOR ITERATIVE SOLVER=   0.00010
       RELAXATION FOR ITERATIVE SOLVER=   0.10000

       HEMICUBE RESOLUTION=   10

       MIN NORMALIZED DIST BEFORE AUTO SUBDIVIDE= 1.000000000E-09

       SELECT      COMPONENT _CM65                                                                                                                                                                                                                                                          

       SELECT      ALL ELEMENTS HAVING ANY NODE IN NODAL SET.

             1018 ELEMENTS (OF      53538  DEFINED) SELECTED FROM
           1919 SELECTED NODES BY  ESLN COMMAND.

      BEFORE SYMMETRIZATION:

      NUMBER OF RADIATION NODES CREATED =        670

      NUMBER OF RADIOSITY SURFACE ELEMENTS CREATED =        581

      AFTER SYMMETRIZATION:

      FULL NUMBER OF RADIATION NODES CREATED =        670

      FULL NUMBER OF RADIOSITY SURFACE ELEMENTS CREATED =       581

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     104829 STEP          1

           104829  NODES (OF     104829  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO      87467 STEP          1

            54119  ELEMENTS (OF      54119  DEFINED) SELECTED BY  ESEL  COMMAND.

       SELECT      COMPONENT _CM79                                                                                                                                                                                                                                                          

       SELECT      ALL ELEMENTS HAVING ANY NODE IN NODAL SET.

            46561 ELEMENTS (OF      54119  DEFINED) SELECTED FROM
          28462 SELECTED NODES BY  ESLN COMMAND.

      BEFORE SYMMETRIZATION:

      NUMBER OF RADIATION NODES CREATED =       7225

      NUMBER OF RADIOSITY SURFACE ELEMENTS CREATED =      14013

      AFTER SYMMETRIZATION:

      FULL NUMBER OF RADIATION NODES CREATED =       7225

      FULL NUMBER OF RADIOSITY SURFACE ELEMENTS CREATED =     14013

       ALL SELECT   FOR ITEM=NODE COMPONENT=   
        IN RANGE         1 TO     112054 STEP          1

           112054  NODES (OF     112054  DEFINED) SELECTED BY NSEL  COMMAND.

       ALL SELECT   FOR ITEM=ELEM COMPONENT=   
        IN RANGE         1 TO     101480 STEP          1

            68132  ELEMENTS (OF      68132  DEFINED) SELECTED BY  ESEL  COMMAND.

       *GET  ANSINTER_  FROM  ACTI  ITEM=INT        VALUE=  0.00000000   

       *IF  ANSINTER_                         ( =   0.00000     )  NE 
            0                                 ( =   0.00000     )  THEN   

       *ENDIF

       *****  MAPDL SOLVE    COMMAND  *****

       CALCULATING VIEW FACTORS USING HEMICUBE METHOD

       RETRIEVED    1 ENCLOSURES.
       TOTAL OF    14594 DEFINED ELEMENT FACES.

       # ENCLOSURE =     1 # SURFACES = 14594 # NODES =  7895


         ******************************************************************************
                      V I E W F A C T O R    S M O O T H I N G
         ******************************************************************************

          Smoothing of viewfactor matrix...
            Max iterations = 100
            Tolerance      = 0.001
            Some of the rows in the viewfactor matrix have all zeros
            row sum total should be                   = 14590.0000
            row sum total before forcing symmetry     = 14587.0815
            row sum total after forcing symmetry      = 14587.0815
            row sum total after smoothing             = 14590.0002
            Raw rowsum error min                      = -7.3418e-01
            Raw rowsum error max                      =  2.3842e-07
            Raw rowsum error mean                     = -1.9998e-04 +/- 9.3284e-03
            Symmetric rowsum error min                = -7.3418e-01
            Symmetric rowsum error max                =  2.3842e-07
            Symmetric rowsum error mean               = -1.9998e-04 +/- 5.7435e-08
            Smoothed rowsum error min                 = -1.7881e-07
            Smoothed rowsum error max                 =  3.5763e-07
            Smoothed rowsum error mean                =  1.4719e-08 +/- 5.1301e-11
            number of iterations to smooth            = 1


         ******************************************************************************
              E N D    O F    V I E W F A C T O R    S M O O T H I N G
         ******************************************************************************



      TIME OF CALCULATION FOR THIS ENCLOSURE =    74.1875   

       CHECKING VIEW FACTOR SUM

       *** NOTE ***                            CP =     110.109   TIME= 13:23:42
       Some of the rows in the viewfactor matrix have all zeros for enclosure 
       1.                                                                     

       *** ERROR ***                           CP =     110.172   TIME= 13:23:42
       No Space Temperature or Space Node specified for open Enclosure 1.     

       ERROR IN VIEW FACTOR CALCULATION

       *** WARNING ***                         CP =     110.172   TIME= 13:23:42
       Some radiation enclosures have viewfactor scaling.  Use VFSM,STAT      
       command to check the status.  Also note that scaling is ignored if the 
       viewfactor sum is <= 0.0.                                              


       NUMBER OF WARNING MESSAGES ENCOUNTERED=          3
       NUMBER OF ERROR   MESSAGES ENCOUNTERED=          1



       ***** PROBLEM TERMINATED BY INDICATED ERROR(S) OR BY END OF INPUT DATA *****

      +--------------------- M A P D L   S T A T I S T I C S ------------------------+

      Release: 2023 R1            Build: 23.1       Update: UP20221128   Platform: WINDOWS x64
      Date Run: 07/19/2024   Time: 13:23     Process ID: 19840
      Operating System: Windows Server 2019  (Build: 17763)

      Processor Model: Intel(R) Xeon(R) CPU E5-2660 v4 @ 2.00GHz

      Compiler: Intel(R) Fortran Compiler Version 19.0.5  (Build: 20190815)
                Intel(R) C/C++ Compiler Version 19.0.5  (Build: 20190815)
                Intel(R) Math Kernel Library Version 2020.0.0 Product Build 20191125
                BLAS Library supplied by Intel(R) MKL

      Number of machines requested            :    1
      Total number of cores available         :   56
      Number of physical cores available      :   28
      Number of processes requested           :    1
      Number of threads per process requested :   24
      Total number of cores requested         :   24 (Shared Memory Parallel)                   

      GPU Acceleration: Not Requested

      Job Name: file
      Input File: dummy.dat
      Working Directory: D:\Ansys Rishi\Ansys Simulations\5\_ProjectScratch\ScrD250

      Total CPU time for main thread                    :       84.1 seconds
      Total CPU time summed for all threads             :      113.5 seconds

      Elapsed time spent obtaining a license            :        0.9 seconds
      Elapsed time spent pre-processing model (/PREP7)  :        0.6 seconds
      Elapsed time spent solution - preprocessing       :        0.0 seconds
      Elapsed time spent computing solution             :        0.0 seconds
      Elapsed time spent solution - postprocessing      :        0.0 seconds
      Elapsed time spent post-processing model (/POST1) :        0.0 seconds
       

      Sum of memory used on all processes               :      162.0 MB
      Sum of memory allocated on all processes          :     2112.0 MB
      Physical memory available                         :         64 GB

      Total amount of I/O written to disk               :        0.0 GB
      Total amount of I/O read from disk                :        0.0 GB

      +------------------ E N D   M A P D L   S T A T I S T I C S -------------------+


       *-----------------------------------------------------------------------------*
       |                                                                             |
       |                               RUN COMPLETED                                 |
       |                                                                             |
       |-----------------------------------------------------------------------------|
       |                                                                             |
       |  Ansys MAPDL 2023 R1         Build 23.1         UP20221128    WINDOWS x64   |
       |                                                                             |
       |-----------------------------------------------------------------------------|
       |                                                                             |
       |  Database Requested(-db)  1024 MB     Scratch Memory Requested      1024 MB |
       |  Maximum Database Used      79 MB     Maximum Scratch Memory Used     83 MB |
       |                                                                             |
       |-----------------------------------------------------------------------------|
       |                                                                             |
       |        CP Time      (sec) =        113.453       Time  =  13:23:42          |
       |        Elapsed Time (sec) =         86.000       Date  =  07/19/2024        |
       |                                                                             |
       *-----------------------------------------------------------------------------*

    • Sampat Kumar
      Ansys Employee

      Hi 
      if your model includes a shell body then apply the radiation boundary condition individually for the shell bodies. Try to run with the same enclosure number and the "close" enclosure type. I believe there's a possibility that some bodies are not covered by the radiation boundary condition enclosure, which explains why this error is occurring. Kindly verify this.

      Secondly, I believe there is some leakage in the enclosure type, which is the reason you are receiving the error. if you are still unable to solve the problem even after adding all the bodies in the enclosure. The enclosure type assing "open" can be used to run it. When using the "open" enclosure type, there might be a possibility that some heat will seep into the surroundings, however, it will not affect your analysis. 

      Best Regards,
      Sampat


    • Rishi Yadav
      Subscriber

      There are no shell bodies. I felt there might be some leakage so I changed the heat shield with no space as shown in image below. I did try to run the simulation with open condition but it is same error. I noticed in the error it is mentionig about, 'no space tempertaure', how can that be specified?

       *** ERROR ***                           CP =     106.672   TIME= 13:52:20
       No Space Temperature or Space Node specified for open Enclosure 1. 

      To run with eclosure type as open. Temperature is rising upto ~1450 degree celcius from 1400 degree celcius but starts decreasing after that. It should reach about 3300 degree celcius. 

    • Sampat Kumar
      Ansys Employee

      Hi Rishi,
      Thanks for your patience. 

      As I explained, the issue is due to the lack of a properly defined or captured radiation surface in the boundary conditions. Since there are inclined plates, bodies outside the close enclosure also participate in radiation heat transfer, which might create an issue in the calculation of view factors.

      It’s crucial to remember that view factors are used to calculate radiation exchange between surfaces. They represent the fraction of radiation leaving one surface that reaches another.

      I would suggest splitting the body that is outside the enclosure which will help you to apply the radiation boundary condition only to the surfaces within the enclosure. I believe this will help you to resolve the issue. 

      Note:- After following the above procedure, you can refine the mesh.  
      Best Regards,
      Sampat

       

       

       

       

    • Rishi Yadav
      Subscriber

      I am getting an error with body split (image attached), and when I tried the face split, the face splitted into 4 parts. There is no body outside the enclosure. There is a build tray, on which a plate is placed on and on that plate there is a layer, which is getting heated. The process is in the vaccum. The heat shield is there (top structure) to prevent the heat loss. Radiation from heat shield is also playing a role in heating the layer. Can we connect over zoom? 

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