01 Overview

Code_Aster, Salome-Meca course materialGNU FDL licence (http://www.gnu.org/copyleft/fdl.html)

Overview on Salome-Meca and Code_Aster

2 - Code_Aster and Salome-Meca course material GNU FDL Licence

Outline

General principles of code and platform

Presentation of Code_Aster

General information for computation


Outline





General principles of code and platform (1/4)

Code_Aster is a stand-alone thermo-mechanical solver No integrated GUI to create geometries and meshesNo colourful post-processing

With study data prepared in a text file

Input: mesh and data setting

Output: physical fields (displacement, strain, stress, temperature )

Pre-processing(CAD, meshes)

Data setting of the mechanical problem

Creation of finite element model and

resolution

Post-processing of results

u, s, e , s, e , s, e , s, e


Salome is a generic framework for pre- and post-proc essing


Salome generic services

CAD MeshData

settingMath.

operationsVisuali-zation

Supervision, GUI and SDM

Code_AsterVarious physical solvers

Solver X Solver YJob

managerMed

format



Code_Aster is a thermo-mechanical solver Salome is a generic platform for physical simulatio ns

Salome-Meca = Salome + Code_Aster (software integra tion)

AdvantagesEasy installation of a complete framework (linux only)A consistent and continuous graphical environment

Access from different modules to main Salome study elements : meshes, results

Graphical selection of topological entities for data setting of Code_Aster

Possibility of using different pre- and post-processing toolsImportation of meshes and geometries prepared by GEOM and SMESH Salome modulesImportation of different input mesh formats and output result formats

Possibility for a stand-alone use of Code_Aster solver


Salome-Meca is the integration of the Code_Aster so lver in the Salome platform

ter module of Salome-Meca


CAD moduleGEOM

Mesh moduleSMESH

SolverCode_Aster

Visualization modulePARAVIS


Outline






An all-purpose code for themo-mechanical study of structuresWith a wide variety of models

More than 400 finite elements: 3D, 2D, shells, beams, pipes

More than 100 constitutive lawsA wide range of solvers: mechanical statics and dynamics, vibrations, modal and harmonic analysis, thermo-hydro-mechanical coupled problems, thermics, metallurgy, acoustics

A computational software used by engineers, experts and researchers Studies: a need of a robust, reliable, tested and qualified industrial simulation code at EDF

Researches: continuous integration of new models in the development versions


Code_Aster for advanced simulations

Solving three types of non-linear problemsMaterial behaviour: about a hundred nonlinear constitutive laws

Kinematic: large displacements, large strains, large rotations

Contact and/or friction

Advanced features in mechanicsPorous media, fracture mechanics, fatigue, damage, metallurgy, seismic analysis, rotating systems ...


Code_Aster : a wide range of behaviours

Elasticity and elasto-plasticityELAS, ELAS_HYPER, VMIS_ISOT_TRAC, VMIS_ISOT_PUIS, VMIS_ISOT_LINE, VMIS_CINE_LINE, VMIS_ECMI_TRAC, VMIS_ECMI_LINE, VMIS_CIN1_CHAB, VMIS_CIN2_CHAB, VMIS_CIN2_MEMO, DIS_CHOC, VMIS_POU_LINE, VMIS_POU_FLEJOU, ARME, ASSE_CORN, DIS_GOUJ2E_PLAS, DIS_GOUJ2E_ELAS, VMIS_ASYM_LINE, DIS_ECRO_CINE , DIS_BILI_ELAS

Elasto-viscoplasticityVISC_ISOT_LINE, VISC_ISOT_TRAC, LEMAITRE, DIS_VISC, VISC_CIN1_CHAB, VISC_CIN2_CHAB, VISC_CIN2_MEMO, VISCOCHAB, NORTON_HOFF, VISC_TAHERI, MONOCRISTAL, POLYCRISTAL

Materials for nuclear fuel and metals under irradia tionVISC_IRRA_LOG, GRAN_IRRA_LOG, GATT_MONERIE, LEMAITRE_IRRA, LMARC_IRRA, LEMA_SEUIL, IRRAD3M, DIS_GRICRA

Models with mechanical effects of metallurgical tra nsformations

Fracture mechanics and damage modelsENDO_FRAGILE, ROUSSELIER, ROUSS_PR, ROUSS_VISC, VENDOCHAB, VISC_ENDO_LEMA, CZM_EXP_REG, CZM_LIN_REG, CZM_EXP, CZM_OUV_MIX , CZM_TAC_MIX, CZM_TRA_MIX , CZM_FAT_MIX, RUPT_FRAG, JOINT_MECA_RUPT, JOINT_MECA_FROT,ENDO_HETEROGENE

Concrete, reinforced concrete, civil engineering mo delsENDO_ISOT_BETON, ENDO_SCALAIRE,ENDO_CARRE , ENDO_ORTH_BETON, MAZARS, BETON_DOUBLE_DP, LABORD_1D, GRILLE_ISOT_LINE, GRILLE_CINE_LINE, GRILLE_PINTO_MEN, PINTO_MENEGOTTO, GLRC_DAMAGE, GLRC_DM , CORR_ACIER , BETON_REGLE_PR, JOINT_BA , GRANGER_FP, GRANGER_FP_V, GRANGER_FP_INDT , BETON_UMLV_FP, BETON_RAG

GeomaterialsELAS_GONF , CJS , LAIGLE , LETK , HOEK_BROWN , HOEK_BROWN_EFF, HOEK_BROWN_TOT , CAM_CLAY , BARCELONE , DRUCK_PRAGER , DRUCK_PRAG_N_A , VISC_DRUC_PRAG, HUJEUX , JOINT_BANDIS

Multi-physics: thermo-hydro-mechanical, concrete, m etallurgy

User materials : UMAT, ZMAT, Aster


Code_Aster : a wide range of finite elements

Continuum mechanics3D

Linear, quadratic, reduced or full integration

2D plane strain, plane stress, axi-symmetry

Integration of non-linear behaviour in plane stress

Structural elements2D elements : shells, plates

1D elements : beams, bars, cables, pipes

Discrete elements : masses, springs, dampers

Connections and assembliesLinear relationships between degrees of freedom, transmission of torques effort

Discontinuous media (cracks and joints)XFEM level-sets

Joint elements and CZM (Cohesive Zone Model)


Code_Aster : algorithms and analysis methods

Mechanical solversLinear or non-linear static : MECA_STATIQUE, STAT_NON_LINE

Dynamic on physical basis : DYNA_LINE_TRAN, DYNA_NON_LINE

Modal analysis : CALC_MODAL, MODE_ITER_*Dynamic on modal basis : DYNA_TRAN_MODAL, DYNA_VIBRA

Other physicsThermics : THER_LINEAIRE, THER_NON_LINE

Acoustics : PHENOMENE ACOUSTIQUE

Metallurgy (for welding applications)FSI : fluid-structure interactionThermo-hydro-mechanical coupling

Tools for resolutionSubstructuring, control of the nonlinear algorithms

Several algebraic solvers, sequential or parallel, direct or iterativePost-processing tools : CALC_CHAMP, POST_CHAMP, POST_DYNA_*


Outline





Stages of a study

AstkComputation launching

Salome (PARAVIS)Visualization application, spreadsheet

Result analysis

Eficas, WizardText editorData setting

Salome (SMESH)Mesh toolMesh generation

Salome (GEOM)CAD modellerGeometry definition

Salome-MecaGeneral toolStep

MED mesh files

MED result files

Code_Astersolving


Code_Aster Study Management (1/2)

Aster module of Salome-MecaSuitable for simple studies

Inputs:One command fileOne mesh

Outputs:A results base

Advanced Study manager: ASTKAvailable in Code_Aster standalone and in Aster module of Salome-Meca

Suitable for simple and advanced studies

Various inputsVarious outputs


Code_Aster Study Management (2/2)

Aster module of Salome-Meca


Creation of a command file (1/4)

With a wizardAvailable in Salome-Meca only4 wizards in Salome-Meca 2013.1

Linear elastic analysisModal analysisLinear thermal analysisCrack analysis

With the graphical command file editor (Eficas)Provided with Salome-MecaProvided with Code_Aster standaloneCannot handle python control flow instructions (if, for,while)

With your favourite text editor (ex: nedit,)Everything is possible!



With a wizard: example of the linear elastic analysis wizard



Overview of the command file

Tab to add or change a keyword

Tab to name the concept

Tab to add a command

With the graphical command file editor (Eficas)



With your favourite text editor (ex: nedit,)


Data setting and command language (1/3)Command file is ALSO a python script

However, we should only focus on the Code_Aster commands

Command file composes of a sequence of Code_Aster specific commands

Each specific command composes of keywords and defines, assigns or uses data as input

Most of the commands produce "concepts"

On the left side of the equal sign ( = )The concepts generated by one command can be used as an input to the following command

Command file contains no geometry description


An example of a command

STEEL = DEFI_MATERIAU (ELAS = _F ( E=205000.E6, NU= 0.3 ) )

An other example IMPR_RESU( RESU = _F ( RESULTAT = RESU ) )

Data setting and command language (2/3)

Name of the concept User choice

Command Factorkeyword

Simple keyword Argumentof the simple keyword

No conceptis produced

Command Factorkeyword

Simple keyword Argumentof the simple keyword


reuse keyword is used to extend an existing conceptMESH = LIRE_MAILLAGE ( FORMAT = MED )MESH = DEFI_GROUP ( reuse = MESH ,

MAILLAGE = MESH,

CREA_GROUP_NO = _F (GROUP_MA = upper ))

Since commands are sequential, a concept must be created before being used

Data setting and command language (3/3)

Reuse of the MAconceptdefined by LIRE_MAILLAGE Indicator of a factor keyword

MESH = LIRE_MAILLAGE()STEEL = DEFI_MATERIAU(ELAS = _F( E = 205000.0E6,

NU = 0.3, ),)CHMAT = AFFE_MATERIAU(MAILLAGE=MESH,

AFFE =_F(TOUT=OUI,MATER=STEEL,),)


EFICAS : a user-freindly interface for data setting

A command file can be prepared by a text editor

An EFICAS wizard prevents user frommaking python/syntax errors (parentheses, = sign, indentation ...)frequently looking for command / keyword spelling and connection

The command catalog that describes the command syntax is specific to a given code version


Code_Aster input and output files (1/2)

Input files:

Command file

Meshes:

Aster (.mail)

Med (.med)

Gibi (.mgib)

Ideas (.unv)

GMSH (.msh)

Bases (folder):

Aster base or HDF

Various data in text format

Output files:

Aster Message file

Aster Result file

Output format:

Med (.med)

Ideas (.unv)

GMSH (.msh)

others

Bases (folder):

Aster base or HDF

Various results in text format


Code_Aster input and output files (2/2) message and result files report the computation information

General information:Code versionDate and time of executionMachine and systemAssigned memory

Summary execution, command by command

Error, warning or information messages


Astk GUI for computation launching (1/4)

GUI Management Study

Files of current

study

Run settingsFile settings ; unit, data file, result file, compr ession,



Command file

Mesh fileHere in MED format

baseFolder containing files (compressed or not) allowing the recovery of the calculation

Message fileVerbatim report of the computation, information, alarms and errors

Result fileText file containing the prints in this format

File containing calculated fieldsHere in MED format

Each file has an associated "type"



Each type of file has a "logical unit" assigned by default. The value can be changed with caution.

Each file can be input (data), output (result), or both (case of the base)

Input file

Output file

Compressed file



File forma01a.commDEBUT()

MESH1 = LIRE_MAILLAGE( UNITE = 20 )MESH2 = LIRE_MAILLAGE( FORMAT = MED,

UNITE = 21 )FIN()

In case of multiple files of the same type (mesh, command file, results), attention to conflicts of "logical units"


Adding test-cases into Salome-Meca installation

Pay attention to the release number

More than 2000 test-cases were developed to verify and validate the development

Test-cases are not included into the Salome-Meca packages due to their very large package size

Test-cases can be downloaded separately from aster-full packages. Then, in the aster-src archive, we have to extract the STA10.8 /astest directory into the suitable directory of the Salome-Meca installation:

~/SALOME-MECA-2013.1 -LGPL/aster/STA 10.8 /astest


Browsing test-cases from Astk GUI

After adding test-cases to Salome-Meca installation directory, they can be imported them into Astk. Test-case description can be found in Code_Aster website (V documents)


End of presentation

Is something missing or unclear in this document?

Or feeling happy to have read such a clear tutorial?

Please, we welcome any feedbacks about Code_Aster training materials.

Do not hesitate to share with us your comments on the Code_Aster forum dedicated thread.

Documents

01 Overview