DAMASK_EICMD/examples/ConfigFiles/numerics.config

77 lines
6.7 KiB
Plaintext

### 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defgradTolerance 1.0e-7 # deviation of deformation gradient that is still allowed (used by CPFEM to determine outdated ffn1)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)
analyticJaco 1 # use analytic Jacobian or perturbation (0 = perturbations, 1 = analytic)
unitlength 1 # physical length of one computational length unit
usepingpong 1 # use the ping pong (collect <-> calc) scheme (always off for Abaqus exp, must be on for Spectral Solver)
## 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 ...
aMax_RGC 1.0e+10 # absolute upper-limit of RGC residuum (in Pa)
rMax_RGC 1.0e+2 # relative ...
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_tolAbs 1.0e-3 # absolute tolerance for fulfillment of stress equilibrium
err_div_tolRel 5.0e-4 # relative tolerance for fulfillment of stress equilibrium
err_curl_tolAbs 1.0e-12 # absolute tolerance for fulfillment of strain compatibility
err_curl_tolRel 5.0e-4 # relative tolerance for fulfillment of strain compatibility
err_stress_tolAbs 1.0e3 # absolute tolerance for fulfillment of stress BC
err_stress_tolRel 0.01 # relative tolerance for fulfillment of stress BC
fftw_timelimit -1.0 # timelimit of plan creation for FFTW, see manual on www.fftw.org, Default -1.0: disable timelimit
rotation_tol 1.0e-12 # tolerance of rotation specified in loadcase, Default 1.0e-12: first guess
fftw_plan_mode FFTW_PATIENT # reads the planing-rigor flag, see manual on www.fftw.org, Default FFTW_PATIENT: use patient planner flag
itmax 250 # Maximum iteration number
itmin 2 # Minimum iteration number
maxCutBack 3 # maximum cut back level (0: 1, 1: 0.5, 2: 0.25, etc)
memory_efficient 1 # Precalculate Gamma-operator (81 double per point)
update_gamma 0 # Update Gamma-operator with current dPdF (not possible if memory_efficient=1)
divergence_correction 2 # Use size-independent divergence criterion
spectralsolver basicPETSc # Type of spectral solver (basicPETSc: basic with PETSc, AL: augmented Lagrange)
spectralfilter none # Type of filtering method to mitigate Gibb's phenomenon (none, cosine, ...)
petsc_options -snes_type ngmres -snes_ngmres_anderson # PetSc solver options
regridMode 0 # 0: no regrid; 1: regrid if DAMASK doesn't converge; 2: regrid if DAMASK or BVP Solver doesn't converge
polarAlpha 1.0 # polarization scheme parameter 0.0 < alpha < 2.0. alpha = 1.0 ==> AL scheme, alpha = 2.0 ==> accelerated scheme
polarBeta 1.0 # polarization scheme parameter 0.0 < beta < 2.0. beta = 1.0 ==> AL scheme, beta = 2.0 ==> accelerated scheme