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DAMASK_EICMD/code/numerics.config

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added version information to all files do NOT edit text like this: $Id: constitutive_phenopowerlaw.f90 406 2009-08-31 14:13:10Z MPIE\f.roters $
2009-08-31 20:39:15 +05:30
### $Id$ ###
numerics.config is now optional; if this file does not exist in the working directory, standard values from numerics.f90 are used; either way the output file tells which values were taken. added some output to the init subroutines of debug.f90, FEsolving.f90, lattice.f90, material.f90 and mesh.f90.
2009-06-18 19:58:02 +05:30
### numerical parameters ###
added a new module called numerics.f90 which reads in all numerical "parameters" from the file numerics.config (also being added). From now on this file has to be located in the working directory of the FEM-model and has to contain all necessary parameters.
2009-06-15 18:41:21 +05:30
new numerics parameter "defgradTolerance" replaces "relevantStrain" in cpfem, since "relevantStrain" is also used in crystallite but in a different context. "defgradTolerance" gets the same standard value as "relevantStrain" so calculations should be consistent with older ones
2010-05-20 20:25:11 +05:30
relevantStrain 1.0e-9 # strain increment considered significant (used by crystallite to determine whether strain inc is considered significant)
defgradTolerance 1.0e-7 # deviation of deformation gradient that is still allowed (used by CPFEM to determine outdated ffn1)
mpie_cpfem_marc.f90 >>> changing the compilation sequence of modules: numerics.f90 and IO.f90 move up, while math.f90 down. IO.f90 >>> adding "inRad" instead of using inRad from math.f90 module, since math.f90 module is now below IO.f90. numerics.f90 >>> now can read the parameter "fixed_seed" from numerics.config. this parameter is used to set a pseudo-random number generator/fixed seeding. default value is 0 (zero), which will give fully random number. math.f90 >> adding a possibility to fix the seeding (i.e., pseudo random number) numerics.config >>> add a new parameter: "fixed_seed"
2009-08-27 21:00:40 +05:30
iJacoStiffness 1 # frequency of stiffness update
iJacoLpresiduum 1 # frequency of Jacobian update of residuum in Lp
introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90: (1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded). (2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded). introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary. parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 19:06:27 +05:30
pert_Fg 1.0e-7 # deformation gradient perturbation for grain tangent
pert_method 1 # perturbation method (1 = forward, 2 = backward or 3 = central)
## crystallite numerical parameters ##
minimum substepping size in homogenization and crystallite is now controlled by two independent parameters subStepMinHomog and subStepMinCryst respectively. deleted flush statements where they are not needed, since they seriously slow down computation.
2009-10-26 22:13:43 +05:30
nCryst 20 # crystallite loop limit (only for debugging info, loop limit is determined by "subStepMinCryst")
subStepMinCryst 1.0e-3 # minimum (relative) size of sub-step allowed during cutback in crystallite
introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90: (1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded). (2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded). introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary. parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 19:06:27 +05:30
subStepSizeCryst 0.25 # size of substep when cutback introduced in crystallite (value between 0 and 1)
stepIncreaseCryst 1.5 # increase of next substep size when previous substep converged in crystallite (value higher than 1)
CPFEM.f90 >>> A very small, not important thing. homogenization.f90 and crystallite.f90 >>> Correction in the algorithm to count the iteration distribution (for better statistics). material.config and numerics.config >>> more collection of parameters.
2009-08-28 20:35:14 +05:30
nState 50 # state loop limit
nStress 200 # stress loop limit
absolute tolerance was just fine -- residuum is in Lp not in stress. Hence, unit is strain and not Pa...
2009-10-19 18:23:56 +05:30
rTol_crystalliteState 1.0e-6 # relative tolerance in crystallite state loop (abs tol provided by constitutive law)
rTol_crystalliteStress 1.0e-6 # relative tolerance in crystallite stress loop (Lp residuum)
aTol_crystalliteStress 1.0e-8 # absolute tolerance in crystallite stress loop (Lp residuum!)
numerics.config is now optional; if this file does not exist in the working directory, standard values from numerics.f90 are used; either way the output file tells which values were taken. added some output to the init subroutines of debug.f90, FEsolving.f90, lattice.f90, material.f90 and mesh.f90.
2009-06-18 19:58:02 +05:30
introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90: (1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded). (2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded). introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary. parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 19:06:27 +05:30
## homogenization numerical parameters ##
nHomog 25 # homogenization loop limit (only for debugging info, loop limit is determined by "subStepMinHomog")
subStepMinHomog 1.0e-3 # minimum (relative) size of sub-step allowed during cutback in homogenization
subStepSizeHomog 0.25 # size of substep when cutback introduced in homogenization (value between 0 and 1)
stepIncreaseHomog 1.5 # increase of next substep size when previous substep converged in homogenization (value higher than 1)
nMPstate 10 # materialpoint state loop limit
## RGC scheme numerical parameters ##
mpie_cpfem_marc.f90 >>> changing the compilation sequence of modules: numerics.f90 and IO.f90 move up, while math.f90 down. IO.f90 >>> adding "inRad" instead of using inRad from math.f90 module, since math.f90 module is now below IO.f90. numerics.f90 >>> now can read the parameter "fixed_seed" from numerics.config. this parameter is used to set a pseudo-random number generator/fixed seeding. default value is 0 (zero), which will give fully random number. math.f90 >> adding a possibility to fix the seeding (i.e., pseudo random number) numerics.config >>> add a new parameter: "fixed_seed"
2009-08-27 21:00:40 +05:30
aTol_RGC 1.0e+4 # absolute tolerance of RGC residuum (in Pa)
rTol_RGC 1.0e-3 # relative ...
added to the previous one
2009-10-30 15:30:17 +05:30
aMax_RGC 1.0e+10 # absolute upper-limit of RGC residuum (in Pa)
introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90: (1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded). (2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded). introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary. parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 19:06:27 +05:30
rMax_RGC 1.0e+3 # relative ...
added to the previous one
2009-10-30 15:30:17 +05:30
perturbPenalty_RGC 1.0e-7 # perturbation for computing penalty tangent
Introduction of a numerical viscosity into the RGC scheme to improve the convergent behavior and the numerical stability of the scheme (see: homogenization_RGC.f90). These changes have been incorporated in all related subroutines (homogenization.f90, IO.f90, numerics.config and numerics.f90).
2009-11-17 19:12:38 +05:30
maxRelaxation_RGC 1.0e+0 # threshold of maximum relaxation vector increment (if exceed this then cutback)
introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90: (1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded). (2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded). introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary. parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 19:06:27 +05:30
forgotten: the change in the input config
2010-03-24 18:58:46 +05:30
relevantMismatch_RGC 1.0e-5 # minimum threshold of mismatch
viscosityPower_RGC 1.0e+0 # power (sensitivity rate) of numerical viscosity in RGC scheme
viscosityModulus_RGC 1.0e+7 # stress modulus of RGC numerical viscosity (zero = without numerical viscosity)
# suggestion: larger than the aTol_RGC but still far below the expected flow stress of material
refRelaxationRate_RGC 1.0e-3 # reference rate of relaxation (about the same magnitude as straining rate, possibly a bit higher)
maxVolDiscrepancy_RGC 1.0e-6 # maximum allowable relative volume discrepancy
volDiscrepancyMod_RGC 1.0e+5
discrepancyPower_RGC 2.0
fixed_seed 10468 # put any number larger than zero, integer, if you want to have a pseudo random distribution