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DAMASK_EICMD
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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
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
relevantStrain 1.0e-7 # strain increment considered significant (used by crystallite to determine whether strain inc is considered significant)
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
defgradTolerance 1.0e-7 # deviation of deformation gradient that is still allowed (used by CPFEM to determine outdated ffn1)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)
* now able to choose method for state integration (integrator and integratorStiffness in numerics.config); standard is "Fixed Point Iteration", which is basically the same as before; others available are "Explicit Euler", "AdaptiveEuler", "Classical Runge-Kutta" and "Runge-Kutta Cash-Karp" * now remembering stiffness similar to how we do it for Lp etc.; avoids undefined stiffness values for nonconverged stiffness calculation * non-local stuff: * changed non-local kinetics (Gilman2002) * enforce zero shearrate for overall carrrier density below relevant density * enforce zero density for those states that become negative and were below relevant density before * dislocation velocity is not limited by V^(1/3) / dt anymore
2010-10-01 17:48:49 +05:30
integrator 1 # integration method (1 = Fixed Point Iteration, 2 = Euler, 3 = Adaptive Euler, 4 = classical 4th order Runge-Kutta, 5 = 5th order Runge-Kutta Cash-Karp)
integratorStiffness 1 # integration method used for stiffness (1 = Fixed Point Iteration, 2 = Euler, 3 = Adaptive Euler, 4 = classical 4th order Runge-Kutta, 5 = 5th order Runge-Kutta Cash-Karp)
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
## 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)
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
nState 10 # state loop limit
nStress 40 # 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!)
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
rTol_crystalliteTemperature 1.0e-6 # relative tolerance in crystallite state/temperature loop
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 ##
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
nHomog 20 # homogenization loop limit (only for debugging info, loop limit is determined by "subStepMinHomog")
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
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)
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
rMax_RGC 1.0e+2 # 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
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
viscosityModulus_RGC 0.0e+0 # stress modulus of RGC numerical viscosity (zero = without numerical viscosity)
forgotten: the change in the input config
2010-03-24 18:58:46 +05:30
# 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)
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
maxVolDiscrepancy_RGC 1.0e-5 # maximum allowable relative volume discrepancy
volDiscrepancyMod_RGC 1.0e+12
discrepancyPower_RGC 5.0
forgotten: the change in the input config
2010-03-24 18:58:46 +05:30
now consistent with numerics.f90 values
2010-09-21 20:07:52 +05:30
fixed_seed 0 # put any number larger than zero, integer, if you want to have a pseudo random distribution
added spectral numeric parameters to numerics.config, changed values for spectral numeric parameters in numerics.f90 to more suitable values for new method for determination of divergence in Fourier space
2011-07-11 19:58:56 +05:30
## spectral parameters ##
err_div_tol 1.0e-2 # 1.0e-4 proposed by Suquet, less strict criteria are usefull
err_defgrad_tol 1.0e-3 # relative tolerance for fullfillment of average deformation gradient (is usually passively fullfilled)
err_stress_tolrel 0.01 # relative tolerance for fullfillment of stress BC
itmax 40 # Maximum iteration number
memory_efficient 1 # Precalculate Gamma-operator (81 double per point)