Fonctionnalités de Code_Aster version 12
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1 Fonctionnalités de Code_Aster version 12
2 Outline Version 12 in a nutshell Fracture mechanics Non-linear constitutive laws Linear and non-linear dynamics Numerical methods Architecture, ergonomics, performances 2
3 Version 12 in a nutshell 3
4 Version 12 stats Few stats : v11 : 896 issues, 4980 days, 5.5 days/issues, 61 contributors v12 : 583 issues, 4521 days, 7.75 days/issues, 62 contributors 4
5 Versions 12 release date v12.4 : stable version released in june Exploitation around december 2015 v13.0 : first testing and unstable version released in june -> new features In june, available in Salome-Meca : v11.9 : last v11 stable-updates version released in june v12.4 : stable version released in june 5
6 Versions 12 release informations From 2016 : Two versions by year for Code_Aster (june & december) Only one version for Salome-Meca (july) Next version, in december, but not in Salome-Meca : v12.5 : stable-updates version v13.1 : testing version Next version, in june, available in Salome-Meca 2016 : v12.6 : stable-updates version v13.2 : testing version 6
7 Fracture mechanics 7
8 Fracture mechanics Extension of XFEM features PhD Developpment of quadratic elements Quadratic elements cut into quadratic elements for integration Coupling THM and XFEM elements Mixed CZM interface laws within XFEM Can handle initial perfect sticking (no regularization) CZM_OUV_MIX, CZM_TAC_MIX Compatible with continuation methods PRED_ELAS New robust law CZM_LIN_MIX Enable crack propagation with theses laws PhD New faster method for crack propagation Fast marching method PROPA_FISS PhD 8
9 Fracture mechanics A simplified use of Gp approach in 2D Enables the prediction of the initiation of a cleavage default CALC_GP RAFF_GP Take into account of an initial state for G computation Meshed crack : available in v11 Non-meshed crack (XFEM) in v12 A post-processing operator for cohesifs models Provide the cohesive crack lengh and the cohesive zone size For standard and rectilinear shape cracks POST_CZM_FISS 9
10 Non-linear constitutive laws 10
11 Non-linear constitutive laws New feature of the scalar damage law Take into account the difference beetwen compression and traction limits COMPORTEMENT= ENDO_FISS_EXP, MODELE= 3D or 3D_GRAD_VARI New feature in DEFI_MATER_GC Concrete material parameters from more physical parameters According to BAEL and now to Eurocode2 New feature for the elasto-viscous law with metalurgy for fuel rod cladding COMPORTEMENT= META_LEMA_ANI Material parameters in cartesian reference 11
12 Non-linear constitutive laws Ability to simulate the keying and the sawing operation : injection of cement grout into the vertical joint pads to confer the dam its monolithic nature such repairs may be considered to reduce stresses in dams affected by concrete swelling JOINT_MECA_RUPT/PRES_CLAVAGE/SCIAGE JOINT_MECA_FROT/SCIAGE 12
13 Non-linear constitutive laws Mohr-Coulomb constitutive law Principal stress formulation Without hardening Implicit Integration STAT_NON_LINE/COMPORTEMENT/RELATION= MOHR_COULOMB Viscous damper Modification of DISC_VISC constitutive law More realistic for low speed Anisotropic materials for Thermo-hydro-mechanical models Anisotropic elastic materials Anisotropic coupling parameters 13
14 Non-linear constitutive laws New constitutive law for reinforced concrete structures under cyclic solicitations and seismic loading homogenised constitutive model DHRC COMPORTEMENT= DHRC PhD 14
15 Non-linear constitutive laws MFront A code generator to simplify the implementations of new material properties, mechanical behaviours and simple material models Allow fast prototyping Better performances Two ways to use Straight forward mode for implemented laws Prototyping mode for user law 15
16 Linear and non-linear dynamics 16
17 Dynamics New features for comparison computing/test (parameter fitting, modal expansion) Construction of kinematically admissible field based on ERC CALC_ERC_DYN Ergonomics enhancements for Modal Analysis Better ergonomics Only one operator for eigenvalues problem CALC_MODES Gather all features of old operators MACRO_MODE_MECA multi-level parallelism MODE_ITER_SIMULT MODE_ITER_INV 17
18 Dynamics Modal analysis for elastic structures featuring shock nonlinearities Computation of non-linear modes Combination of the harmonic balance method and asymptotic numerical method (ANM) MODE_NON_LINE Retrieve a specific periodic solution from the set of periodic solutions REST_MODE_NONL Determine the stability or instability of a periodic solution CALC_STABILITE PhD 18
19 Seismic Linear equivalent method for column of soil Characterize the variation in the mechanical properties of laminate soil layers during an earthquake DEFI_SOL_EQUI New method for non-linear SSI LAPLACE-TEMPS method CALC_MISS / FICHIER_TEMPS 19
20 Numerical methods 20
21 Numerical methods Computation of Frobenius norm for matrix Close to L2 norm Usefull for model reduction Extension of volumogramm computation on all structural elements Plates and shells : DKT, DST, Q4G, COQUE_3D Beams : POU_D_EM, POU_T_TGM Pipes : TUYAU_3M, TUYAU_6M 21
22 Numerical methods New formulation to accurately manage incompressibility with finite strain MODELE= XXX_INCO_UPO Reorganisation of incompressible models XXX_INCO : mixed 3 fields formulation UPG in small strain PhD XXX_INCO_GD : mixed 3 fields formulation UPG in large strain SIMO_MIEHE XXX_INCO_LOG : mixed 3 fields formulation UPG in large strain GDEF_LOG MODELE= XXX_INCO_UPG MODELE= XXX_INCO_UP 22
23 Numerical methods Lagrange multipliers elimination Preventing convergence with iterative solvers and complex boundary conditions Improve robustness and accuracy for complex modal problems Allow multi-grid methods from PETSc library (GAMG, ML, BOOMER) SOLVEUR / ELIM_LAGR= OUI Matrix profiles before and after elimination 23
24 Numerical methods Post-processing of contact pressure From stress tensor on nodes Only for isoparametric elements CALC_PRESSION New connection procedure between 3D and beam Based on an Arlequin framework 3D_POU_ARLEQUIN PhD New element cable-gaine Cable stick-slip 24
25 Architecture, ergonomics, performances 25
26 Architecture, ergonomics, performances New version of PETSc library 3.4 New high-performance preconditioners Based on multigrid algorithms SOLVEUR/METHODE= PETSC,PRE_COND= ML, BOOMER or GAMG Performances on a laser pinning simulation Linear mesh : nodes, dof Quadratic mesh : nodes, dof 16 procs on 4 nodes GAMG MUMPS USER : 118,45 s SYSTEM : 5,48 s USER : 591,22 s SYSTEM : 48,58 s 20Go/node 50 Go/node GAMG MUMPS 26 USER : 1171,83 s SYSTEM : 30,13 s Impossible, memory limit 33Go/node 64 Go/node 26
27 Architecture, ergonomics and performances Refactoring of CALC_EUROPLEXUS coupling Code_Aster and EUROPLEXUS New command to read Europlexus results : LIRE_EUROPLEXUS New checking for assignment Caracteristics for structural elements AFFE_CARA_ELEM Loadings AFFE_CHAR_MECA Consistency between users data and the range of code capabilities 27
28 From open-source community 28
29 From open-source community Potential thermal energy for anisotropic elastic material Arnaud Alzina from le CENTRE EUROPÉEN de la CERAMIQUE Virtual gap as a time function for contact feature Peter Halverson Eigenmodes and frequency response computation of structures with viscoelastic materials (DYNA_VISCO) Tangent Delta (Nicolas Merlette, Benjamin Delmache) 29
30 Thank you for your attention 30
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