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#1 Re: Code_Aster usage » Incomplete mesh assignment for MODEL = AFFE_MODELE » 2019-11-21 15:11:09

hello

i am no specialist in thermal
but the difference is 508
equal to the number of SEG2
also equal to the number in right, left and bottom

isnt the trouble lying in the mesh

cannot say more without the included files

jean pierre aubry

#2 Re: Code_Aster usage » Nonlinear Simulation of Shell Structure » 2019-11-15 17:53:23

hello

are you sure you run the same problem
in code_aster it fails on the first step of the calculation

i think your problem is ill defined
do you understand all the commands in the .comm file

also the mesh is unduly fine

jean pierre aubry

#3 Re: Code_Aster usage » Mass point » 2019-11-07 08:00:14

the run looks like ok
the error is somewhere else
we need the mesh to understand and the values calculated by ansys

#4 Re: Code_Aster usage » Mass point » 2019-11-05 08:52:10

right deszit
that is it
+ a few other mistakes

#5 Re: Code_Aster usage » [SOLVED] Stress analysis on a symmetrical shaft » 2019-11-04 15:34:43

without the message file it is impossible to tell what is happening

#6 Re: Code_Aster usage » [SOLVED] Stress analysis on a symmetrical shaft » 2019-11-04 08:01:52

hello

the message is very clear
in 3D elements rotational  DOF are not supported
and this is basic in finite element analysis

jean pierre aubry

#7 Re: Code_Aster usage » Mass point » 2019-11-02 08:46:45

                     CREA_GROUP_MA=_F(NOM='TOUT',
                                      GROUP_MA='Steel_SOLID',
                                      TYPE_MAILLE='POI1',

in the above code if you replace GROUP_MA by GROUP_NO you will create a POI1 on ALL the node belonging to 'Steel_SOLID'
if you want to create a POI1 on one node you have to create a group on this node in the mesh before hand

NOM='TOUT' is not very clever

#8 Re: Code_Aster usage » Mass point » 2019-11-01 17:09:53

hello

without knowing the time this error arises it is impossibleo give any advice
please post the fumm message file

jean pierre aubry

#9 Re: Code_Aster usage » contact interpénétration et questions diverses » 2019-10-30 10:05:28

hello

DavidT wrote:

Hi everyone, I'm wondering if the parallelized version of Code Aster can handel contact problems. Please, if anyone know the answer to that question and/or has some experience or documentation related, we'd be very thankful. Cheers!

it is my feeling that if the parallel version was behaving differently from the sequential one there would be hundreds of post complaining about it on this forum

jean pierre aubry

#10 Re: Code_Aster usage » Help with prestressed beam » 2019-10-30 09:55:15

hello

I am no specialist about concrete matters
but i wonder wether this is not a mesh issue
as the groups Conc and T1 do not share any common nodes

jean pierre aubry

#12 Re: Code_Aster usage » Differences in Von Mises Stresses » 2019-10-09 06:54:47

Since the plate is subjected to pure tension, according to the analytical solution:
sigma = F/A
F ~= 600000 Nt
A = 1000 x 5 = 5000 mm^2
so sigma = 120 MPa.

this is only true far away from the boundary conditions

the mesh is quite coarse and
the constrs boundary condition with full "encastre"
lead to a high stress concentration at the corners

#13 Re: Code_Aster usage » Differences in Von Mises Stresses » 2019-10-08 07:56:03

i use code_aster stand alone v 14.2 linux version
this is the output of the .mess file

if i open the file with a text editor i can see this is surely not a .med file

# ------------------------------------------------------------------------------------------
  # Commands No:  0002 Concept of the type:  maillage_sdaster
  # ------------------------------------------------------------------------------------------
  mesh = LIRE_MAILLAGE(FORMAT='MED',
                       UNITE=20,
                       INFO_MED=1,
                       INFO=1,
                       VERI_MAIL=_F(APLAT=1.E-3,
                                    VERIF='OUI',),
                       )

   
   !-----------------------------------------------------------------!
   ! <A> <MODELISA9_44>                                              !
   !                                                                 !
   !  fichier MED :  fort.20 maillage :   erreur numéro  -1          !
   !                                                                 !
   !                                                                 !
   ! This is a warning. If you do not understand the meaning of this !
   !  warning, you can obtain unexpected results!                    !
   !-----------------------------------------------------------------!
   
   
   !-------------------------------------------------------------------------------!
   ! <EXCEPTION> <PREPOST3_10>                                                     !
   !                                                                               !
   !  either the file does not exist, or it is a bad version of HDF (uses by MED). !
   !-------------------------------------------------------------------------------!

#14 Re: Code_Aster usage » Differences in Von Mises Stresses » 2019-10-08 06:56:34

Compound_Mesh_1.sauv is not a .med mesh file
i cannot open it
is it CASTEM2000 ?

#15 Re: Code_Aster usage » Differences in Von Mises Stresses » 2019-10-07 10:38:33

hello

it would be nice to have the full command file and maybe the mesh
as a few [common] mistakes may be hidden in the non submitted part

nevertheless it is a good idea to make an IMPR_RESU with ASCII values and VALE_MIN and VALE_Max to check out the calculations
as a few other [common] mistakes may be in the handling of Paravis or Gmsh

the above procedure is a must in my own opinion as it is pretty easy to get a post pro viewer to show on the screen values with strange relation to the calculated ones

jean pierre aubry

#16 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-05 06:40:10

rep_trav
contains all the file produced in the study including the base
it is specified in /$HOME/.astkrc/prefs like this
rep_trav :/some_dir
i do not how in salome_meca

in /tmp there are a  few intermediate files automatically deleted this usually is not very large and has never been a source of trouble for me
(i have run studies of more than 24 hours with a base of well over 30 GB)
the directory of the problem is not deleted but is almost empty at the end of the study
i do not know how to redirect in another dir than /tmp
and i think this is of no importance

/tmp contains a lot of useless files other than the code_aster ones

in /$HOME/flasheur
you have some file including message ones
this directory is never cleaned up by code_aster you have to do it by hand

it is easy so scrutinize in the above dirs what is going on when the problem is running and you will see that almost nothing appears in /tmp and a lot in /rep_trav
by the way the studies you submitted here are of rather modest size


all this and quite a few other hints is in my book

#17 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-04 15:22:13

my opensuse system is set so that /tmp is never automatically cleaned up
i do that by hand when needed so i know what i am deleting

if /tmp is in sda2 you obsiously have to clean it up

My goal now is to understand and know if it is possible to move these generated files in the /tmp folder inside the root directory to a /tmp folder elsewhere ($HOME).

what for????????????
with code_aster stand alone this is possible i do not know about salome-meca
cleaning /tmp should be enough

#18 Re: Code_Aster usage » Calculer l'énérgie de déformation totale » 2019-10-04 14:41:47

bonjour

et avec
ENER_TOTALE=_F(GROUP_MA='bla','blabla'),

jean pierre aubry

#19 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-04 14:35:58

and what is the size of flasheur ?
how many files in it ?

and another question what do you call /root
in a normal linux install a regular user cannot open /root folder
but i do not know ubuntu

#20 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-04 13:18:29

I used the autoremove, autoclean and clean commands to clean the system and also cleared the browser browsing history.

i do not understand these commands what are they supposed to do

1- are you running salome-meca as root on your system ???
this is really calling for trouble and should NEVER be done

2-you should look for a repertory called flasheur that should be in $HOME
if a normal user run is made
if you are running salome-meca as root it may be in /root directory

this flasheur directory holds all the results of any previous calculation made successful or not
clean it with caution if it is in /root

and never run a software as root unless you really know what you are doing

all this explained in my book take time to have a look at it

#21 Code_Aster installation » code_aster 14.4 on opensuse leap15.1 all good » 2019-10-04 10:43:52

jeanpierreaubry
Replies: 1

hello

i have just installed code_aster 14.4 on opensuse leap15.1
all good
except i had to create  a symlink libpython3.6.so pointing to libpython3.so

i ran an existing simple problem on astk
all good

all my best to the code_aster team

just one little thing
it would be good to have in the doc
python3 setup.py
instead of
python setup.py

jean pierre aubry

#22 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-04 07:23:07

I believe it is lack of space, because before the simulation stops, Ubuntu warns about the lack of space in the /root directory.
I don't know what to do to get around this.

you can get information by running df in a terminal
and if it is true the trouble is not a code_aster one
and is easy to solve
make free space!!

#24 Re: Code_Aster installation » [SOLVED] Number of threads used by code_aster » 2019-10-03 15:57:26

hello

i do not understand what you call number of threads

if i change the number of cpu (exactly number of core)
on my export files generated with Astk i have the line
ncpus 4
4 being the number of the physiscal core i have

the increase in speed depends on the problem and is not much

jean pierre aubry

#25 Re: Code_Aster usage » [SOLVED] Simulation without result and without error » 2019-10-03 15:31:43

the problem raises an error with code_aster 14.2 stand alone
this error can easily rectified
but this may be just a question of parameter ignored by AsterStudy
i do not know

please post the complete message file
there be some sort of warning which you missed out