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Restart impossible when I want to launch several load cases
2

Restart impossible when I want to launch several load cases

Restart impossible when I want to launch several load cases

(OP)
Hi everyone,

I generate with a firt static analysis the output files :

Quote:

plaque_shell.DBALL,
plaque_shell.MASTER
plaque_shell.neut

with the nastran command :

nastran20131 old=no smp=2 news=no scr=no memory=8GB smemory=3200 /home/user/plaque_shell/plaque_shell.bdf with the bulk file below :

CODE --> nastran

$**********************************************************
$
$ BULK TO BE USED TO CREATE THE .DBALL & .MASTER OF
$ THE MODEL FOR RESTART PURPOSE
$
$**********************************************************
ASSIGN OUTPUT2 = 'plaque_shell.neut', UNIT = 12, FORM = FORMATTED
SOL 101
INCLUDE './DMAP/dmap_modele'
CEND
TITLE = PLAQUE SHELL
ECHO = NONE

SPC = 1

DISP = NONE
$
BEGIN BULK
$ Use PARAM,POST,-1 to have a no empty .neut file
PARAM,POST,-1
$ BOUNDARY CONDITIONS

SPC1     1       123456  1       12      23      34      45      56             
         67      78      89      100     111                                    
$
CQUAD4   1       2       1       2       13      12                             
CQUAD4   2       2       2       3       14      13                             
CQUAD4   3       2       3       4       15      14                             
CQUAD4   4       2       4       5       16      15                             
CQUAD4   5       2       5       6       17      16                             
CQUAD4   6       2       6       7       18      17                             
CQUAD4   7       2       7       8       19      18                             
CQUAD4   8       2       8       9       20      19                             
CQUAD4   9       2       9       10      21      20                             
CQUAD4   10      2       10      11      22      21                             
CQUAD4   11      2       12      13      24      23                             
CQUAD4   12      2       13      14      25      24                             
CQUAD4   13      2       14      15      26      25                             
CQUAD4   14      2       15      16      27      26                             
CQUAD4   15      2       16      17      28      27                             
CQUAD4   16      2       17      18      29      28                             
CQUAD4   17      2       18      19      30      29                             
CQUAD4   18      2       19      20      31      30                             
CQUAD4   19      2       20      21      32      31                             
CQUAD4   20      2       21      22      33      32                             
CQUAD4   21      2       23      24      35      34                             
CQUAD4   22      2       24      25      36      35                             
CQUAD4   23      2       25      26      37      36                             
CQUAD4   24      2       26      27      38      37                             
CQUAD4   25      2       27      28      39      38                             
CQUAD4   26      2       28      29      40      39                             
CQUAD4   27      2       29      30      41      40                             
CQUAD4   28      2       30      31      42      41                             
CQUAD4   29      2       31      32      43      42                             
CQUAD4   30      2       32      33      44      43                             
CQUAD4   31      2       34      35      46      45                             
CQUAD4   32      2       35      36      47      46                             
CQUAD4   33      2       36      37      48      47                             
CQUAD4   34      2       37      38      49      48                             
CQUAD4   35      2       38      39      50      49                             
CQUAD4   36      2       39      40      51      50                             
CQUAD4   37      2       40      41      52      51                             
CQUAD4   38      2       41      42      53      52                             
CQUAD4   39      2       42      43      54      53                             
CQUAD4   40      2       43      44      55      54                             
CQUAD4   41      2       45      46      57      56                             
CQUAD4   42      2       46      47      58      57                             
CQUAD4   43      2       47      48      59      58                             
CQUAD4   44      2       48      49      60      59                             
CQUAD4   45      2       49      50      61      60                             
CQUAD4   46      2       50      51      62      61                             
CQUAD4   47      2       51      52      63      62                             
CQUAD4   48      2       52      53      64      63                             
CQUAD4   49      2       53      54      65      64                             
CQUAD4   50      2       54      55      66      65                             
CQUAD4   51      2       56      57      68      67                             
CQUAD4   52      2       57      58      69      68                             
CQUAD4   53      2       58      59      70      69                             
CQUAD4   54      2       59      60      71      70                             
CQUAD4   55      2       60      61      72      71                             
CQUAD4   56      2       61      62      73      72                             
CQUAD4   57      2       62      63      74      73                             
CQUAD4   58      2       63      64      75      74                             
CQUAD4   59      2       64      65      76      75                             
CQUAD4   60      2       65      66      77      76                             
CQUAD4   61      2       67      68      79      78                             
CQUAD4   62      2       68      69      80      79                             
CQUAD4   63      2       69      70      81      80                             
CQUAD4   64      2       70      71      82      81                             
CQUAD4   65      2       71      72      83      82                             
CQUAD4   66      2       72      73      84      83                             
CQUAD4   67      2       73      74      85      84                             
CQUAD4   68      2       74      75      86      85                             
CQUAD4   69      2       75      76      87      86                             
CQUAD4   70      2       76      77      88      87                             
CQUAD4   71      2       78      79      90      89                             
CQUAD4   72      2       79      80      91      90                             
CQUAD4   73      2       80      81      92      91                             
CQUAD4   74      2       81      82      93      92                             
CQUAD4   75      2       82      83      94      93                             
CQUAD4   76      2       83      84      95      94                             
CQUAD4   77      2       84      85      96      95                             
CQUAD4   78      2       85      86      97      96                             
CQUAD4   79      2       86      87      98      97                             
CQUAD4   80      2       87      88      99      98                             
CQUAD4   81      2       89      90      101     100                            
CQUAD4   82      2       90      91      102     101                            
CQUAD4   83      2       91      92      103     102                            
CQUAD4   84      2       92      93      104     103                            
CQUAD4   85      2       93      94      105     104                            
CQUAD4   86      2       94      95      106     105                            
CQUAD4   87      2       95      96      107     106                            
CQUAD4   88      2       96      97      108     107                            
CQUAD4   89      2       97      98      109     108                            
CQUAD4   90      2       98      99      110     109                            
CQUAD4   91      2       100     101     112     111                            
CQUAD4   92      2       101     102     113     112                            
CQUAD4   93      2       102     103     114     113                            
CQUAD4   94      2       103     104     115     114                            
CQUAD4   95      2       104     105     116     115                            
CQUAD4   96      2       105     106     117     116                            
CQUAD4   97      2       106     107     118     117                            
CQUAD4   98      2       107     108     119     118                            
CQUAD4   99      2       108     109     120     119                            
CQUAD4   100     2       109     110     121     120                            
$
GRID     1               0.      0.      0.                                     
GRID     2              10.      0.      0.                                     
GRID     3              20.      0.      0.                                     
GRID     4              30.      0.      0.                                     
GRID     5              40.      0.      0.                                     
GRID     6              50.      0.      0.                                     
GRID     7              60.      0.      0.                                     
GRID     8              70.      0.      0.                                     
GRID     9              80.      0.      0.                                     
GRID     10             90.      0.      0.                                     
GRID     11             100.     0.      0.                                     
GRID     12              0.     10.      0.                                     
GRID     13             10.     10.      0.                                     
GRID     14             20.     10.      0.                                     
GRID     15             30.     10.      0.                                     
GRID     16             40.     10.      0.                                     
GRID     17             50.     10.      0.                                     
GRID     18             60.     10.      0.                                     
GRID     19             70.     10.      0.                                     
GRID     20             80.     10.      0.                                     
GRID     21             90.     10.      0.                                     
GRID     22             100.    10.      0.                                     
GRID     23              0.     20.      0.                                     
GRID     24             10.     20.      0.                                     
GRID     25             20.     20.      0.                                     
GRID     26             30.     20.      0.                                     
GRID     27             40.     20.      0.                                     
GRID     28             50.     20.      0.                                     
GRID     29             60.     20.      0.                                     
GRID     30             70.     20.      0.                                     
GRID     31             80.     20.      0.                                     
GRID     32             90.     20.      0.                                     
GRID     33             100.    20.      0.                                     
GRID     34              0.     30.      0.                                     
GRID     35             10.     30.      0.                                     
GRID     36             20.     30.      0.                                     
GRID     37             30.     30.      0.                                     
GRID     38             40.     30.      0.                                     
GRID     39             50.     30.      0.                                     
GRID     40             60.     30.      0.                                     
GRID     41             70.     30.      0.                                     
GRID     42             80.     30.      0.                                     
GRID     43             90.     30.      0.                                     
GRID     44             100.    30.      0.                                     
GRID     45              0.     40.      0.                                     
GRID     46             10.     40.      0.                                     
GRID     47             20.     40.      0.                                     
GRID     48             30.     40.      0.                                     
GRID     49             40.     40.      0.                                     
GRID     50             50.     40.      0.                                     
GRID     51             60.     40.      0.                                     
GRID     52             70.     40.      0.                                     
GRID     53             80.     40.      0.                                     
GRID     54             90.     40.      0.                                     
GRID     55             100.    40.      0.                                     
GRID     56              0.     50.      0.                                     
GRID     57             10.     50.      0.                                     
GRID     58             20.     50.      0.                                     
GRID     59             30.     50.      0.                                     
GRID     60             40.     50.      0.                                     
GRID     61             50.     50.      0.                                     
GRID     62             60.     50.      0.                                     
GRID     63             70.     50.      0.                                     
GRID     64             80.     50.      0.                                     
GRID     65             90.     50.      0.                                     
GRID     66             100.    50.      0.                                     
GRID     67              0.     60.      0.                                     
GRID     68             10.     60.      0.                                     
GRID     69             20.     60.      0.                                     
GRID     70             30.     60.      0.                                     
GRID     71             40.     60.      0.                                     
GRID     72             50.     60.      0.                                     
GRID     73             60.     60.      0.                                     
GRID     74             70.     60.      0.                                     
GRID     75             80.     60.      0.                                     
GRID     76             90.     60.      0.                                     
GRID     77             100.    60.      0.                                     
GRID     78              0.     70.      0.                                     
GRID     79             10.     70.      0.                                     
GRID     80             20.     70.      0.                                     
GRID     81             30.     70.      0.                                     
GRID     82             40.     70.      0.                                     
GRID     83             50.     70.      0.                                     
GRID     84             60.     70.      0.                                     
GRID     85             70.     70.      0.                                     
GRID     86             80.     70.      0.                                     
GRID     87             90.     70.      0.                                     
GRID     88             100.    70.      0.                                     
GRID     89              0.     80.      0.                                     
GRID     90             10.     80.      0.                                     
GRID     91             20.     80.      0.                                     
GRID     92             30.     80.      0.                                     
GRID     93             40.     80.      0.                                     
GRID     94             50.     80.      0.                                     
GRID     95             60.     80.      0.                                     
GRID     96             70.     80.      0.                                     
GRID     97             80.     80.      0.                                     
GRID     98             90.     80.      0.                                     
GRID     99             100.    80.      0.                                     
GRID     100             0.     90.      0.                                     
GRID     101            10.     90.      0.                                     
GRID     102            20.     90.      0.                                     
GRID     103            30.     90.      0.                                     
GRID     104            40.     90.      0.                                     
GRID     105            50.     90.      0.                                     
GRID     106            60.     90.      0.                                     
GRID     107            70.     90.      0.                                     
GRID     108            80.     90.      0.                                     
GRID     109            90.     90.      0.                                     
GRID     110            100.    90.      0.                                     
GRID     111             0.     100.     0.                                     
GRID     112            10.     100.     0.                                     
GRID     113            20.     100.     0.                                     
GRID     114            30.     100.     0.                                     
GRID     115            40.     100.     0.                                     
GRID     116            50.     100.     0.                                     
GRID     117            60.     100.     0.                                     
GRID     118            70.     100.     0.                                     
GRID     119            80.     100.     0.                                     
GRID     120            90.     100.     0.                                     
GRID     121            100.    100.     0.                                     
MAT1     1      750000.         .3                                              
PSHELL   2       1      .5       1               1                              
$
ENDDATA 

With these files I would like to launch 2 load cases with 2 separate analysis.

The first analysis is Fz load :

CODE --> nastran

$*****************************************************************************
$
$ BULK TO BE USED TO LAUNCH STUDY WITH .MASTER FILE
$
$
$****************************************************************************
RESTART VERSION=1
ASSIGN MASTER = 'plaque_shell.MASTER'
SOL 101
INCLUDE './DMAP/dmap_charge'
CEND
TITLE = PLAQUE SHELL
ECHO = NONE
SPC = 1
$
DISP(PLOT)=ALL
OLOAD(PLOT)=ALL
STRESS(PLOT)=ALL
$
SUBCASE=100
    SUBTITLE = PLAQUE_SHELL_Fz
    LABEL = PLAQUE_SHELL_Fz_STATIC
    LOAD = 1
$
BEGIN BULK
PARAM   POST    -1
PARAM   AUTOSPC NO
$
FORCE    1       11      0      1000.    0.      0.     1.                      
FORCE    1       22      0      1000.    0.      0.     1.                      
FORCE    1       33      0      1000.    0.      0.     1.                      
FORCE    1       44      0      1000.    0.      0.     1.                      
FORCE    1       55      0      1000.    0.      0.     1.                      
FORCE    1       66      0      1000.    0.      0.     1.                      
FORCE    1       77      0      1000.    0.      0.     1.                      
FORCE    1       88      0      1000.    0.      0.     1.                      
FORCE    1       99      0      1000.    0.      0.     1.                      
FORCE    1       110     0      1000.    0.      0.     1.                      
FORCE    1       121     0      1000.    0.      0.     1.
$
ENDDATA 

I submit this analysis with the nastran command :

nastran20131 old=no smp=2 news=no scr=no memory=8GB smemory=3200 /home/user/plaque_shell/loadcase_Fz.bdf

I get the output files without message errors and a good OP2 result file bigsmile


The second analysis is Fx load :

CODE --> nastran

$*****************************************************************************
$
$ BULK TO BE USED TO LAUNCH STUDY WITH .MASTER FILE
$
$
$****************************************************************************
RESTART VERSION=1
ASSIGN MASTER = 'plaque_shell.MASTER'
SOL 101
INCLUDE './DMAP/dmap_charge'
CEND
TITLE = PLAQUE SHELL
ECHO = NONE
SPC = 1
$
DISP(PLOT)=ALL
OLOAD(PLOT)=ALL
STRESS(PLOT)=ALL
$
SUBCASE=100
    SUBTITLE = PLAQUE_SHELL_Fx
    LABEL = PLAQUE_SHELL_Fx_STATIC
    LOAD = 1
$
BEGIN BULK
PARAM   POST    -1
PARAM   AUTOSPC NO
$
FORCE    1       11      0      1000.    1.      0.     0.                      
FORCE    1       22      0      1000.    1.      0.     0.                      
FORCE    1       33      0      1000.    1.      0.     0.                      
FORCE    1       44      0      1000.    1.      0.     0.                      
FORCE    1       55      0      1000.    1.      0.     0.                      
FORCE    1       66      0      1000.    1.      0.     0.                      
FORCE    1       77      0      1000.    1.      0.     0.                      
FORCE    1       88      0      1000.    1.      0.     0.                      
FORCE    1       99      0      1000.    1.      0.     0.                      
FORCE    1       110     0      1000.    1.      0.     0.                      
FORCE    1       121     0      1000.    1.      0.     0.
$
ENDDATA 

I submit this analysis with the nastran command :

nastran20131 old=no smp=2 news=no scr=no memory=8GB smemory=3200 /home/user/plaque_shell/loadcase_Fx.bdf

When I submit this analysis I get an error message in the f06 output file :

Quote:


*** USER FATAL MESSAGE 1145 (RSPRVR)
THE VERSION ID = 1 OF PROJECT ' "BLANK"' SPECIFIED ON RESTART CARD HAS BEEN DELETED
PRIOR TO THIS RUN. A RESTART IS IMPOSSIBLE.
*** SYSTEM INFORMATION MESSAGE 480 ()
JOB TERMINATED DUE TO ABOVE ERROR(S) IN THE FILE MANAGEMENT SECTION.

If I submit the loadcase_Fx.bdf first and then loadcase_Fz.bdf, I get results for Fx load case and error message with Fz load case.

If someone can help me to explain myself what is the problem.

thanks a lot



RE: Restart impossible when I want to launch several load cases

The problem is with your restart version, every time you run a restart, the version of your MASTER is incremented by one, and the previous version MASTER is deleted by default. So, after you ran the Fz load, your version is now 2, but then your Fx run has the line "RESTART VERSION=1", which makes it look for a version that no longer exists.

Since nothing is really changing with your MASTER after each run, I would replace the line "RESTART VERSION=1" with just "RESTART". This allows Nastran to follow its default and just use the most recent version MASTER that it can find.

For more info, see the "MSC.Nastran Linear Elastic User's Guide".

RE: Restart impossible when I want to launch several load cases

(OP)
Thanks a lot for your answer.

I have submit Fx load first and then Fz.

When I plot Fz results, and particulary Applied Loads, Translational, the Resultant it is a combination of Fx component and Fz component as you can see in the attached picture

Display Applied Load Resultant
.


Display Applied Load Fx Component




Display Applied Load Fz Component



I am not sure I understand. Normaly the Applied Load must be pure Fz and Fx component must be zero.

RE: Restart impossible when I want to launch several load cases

Apologies nekcorp, I gave you bad advice! I didn't notice that both of your runs use a FORCE ID of 1 to apply the load. It seems that the restart process keeping the Fx load in the MASTER file after the Fx run, then it gets combined with you Fz load in the Fz run.

Try using "RESTART VERSION=1,KEEP". This will make sure you're only ever using the original MASTER, and specifying KEEP will prevent Nastran from deleting it.

RE: Restart impossible when I want to launch several load cases

(OP)
Thanks a lot for your explanations ! all it is good now thumbsup2

RE: Restart impossible when I want to launch several load cases

As Countryman pointed out, without the KEEP keyword, the versions in the MASTER/DBALL are incremented and the previous version deleted. With KEEP, a new version is added, but the previous version is not deleted. However, this means that every time you do a restart, a new version is added to the MASTER/DBALL database and its gets bigger and bigger. If your restart fails, you may end up with an unusable database. If you don't want this to happen, you can use the LOGICAL keyword when you assign the database, like this:

ASSIGN MAST1='plaque_shell.MASTER'
RESTART, VERSION=1, LOGICAL=MAST1

This is called a READ ONLY restart. The plaque_shell.MASTER and plaque_shell.DBALL files will not be touched by the restart but the data in them is made available for the current job. The current job (i.e. the restart job) will create its own MASTER/DBALL files if you use scr=no. This means you can use the restart database to do another restart, or do other restarts from the original database. It also means you can run the restart job with the scr=yes command line option if you do not want to make restarts from the restart.

DG

RE: Restart impossible when I want to launch several load cases

(OP)
Hi dmapguru,

thanks a lot for your precision. My goal it is to use a .MASTER and .DBALL file to have the model with boundary conditions and then use it to launch several load cases.

It is better to the .MASTER and .DBALL do not get bigger.

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