DAMASK_EICMD/code/config/numerics.config

59 lines
4.6 KiB
Plaintext
Raw Normal View History

### $Id$ ###
### numerical parameters ###
relevantStrain 1.0e-7 # 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defgradTolerance 1.0e-7 # deviation of deformation gradient that is still allowed (used by CPFEM to determine outdated ffn1)
iJacoStiffness 1 # frequency of stiffness update
iJacoLpresiduum 1 # frequency of Jacobian update of residuum in Lp
pert_Fg 1.0e-7 # deformation gradient perturbation for grain tangent
pert_method 1 # perturbation method (1 = forward, 2 = backward or 3 = central)
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)
## crystallite numerical parameters ##
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
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)
nState 10 # state loop limit
nStress 40 # stress loop limit
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!)
rTol_crystalliteTemperature 1.0e-6 # relative tolerance in crystallite state/temperature loop
## homogenization numerical parameters ##
nHomog 20 # 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 ##
aTol_RGC 1.0e+4 # absolute tolerance of RGC residuum (in Pa)
rTol_RGC 1.0e-3 # relative ...
2009-10-30 15:30:17 +05:30
aMax_RGC 1.0e+10 # absolute upper-limit of RGC residuum (in Pa)
rMax_RGC 1.0e+2 # relative ...
2009-10-30 15:30:17 +05:30
perturbPenalty_RGC 1.0e-7 # perturbation for computing penalty tangent
maxRelaxation_RGC 1.0e+0 # threshold of maximum relaxation vector increment (if exceed this then cutback)
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 0.0e+0 # 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-5 # maximum allowable relative volume discrepancy
volDiscrepancyMod_RGC 1.0e+12
discrepancyPower_RGC 5.0
fixed_seed 0 # put any number larger than zero, integer, if you want to have a pseudo random distribution
## 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)