2020-07-09 15:56:35 +05:30
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# Available numerical parameters
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# Case sensitive keys
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homogenization:
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mech:
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2020-09-30 14:23:05 +05:30
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RGC:
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atol: 1.0e+4 # absolute tolerance of RGC residuum (in Pa)
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rtol: 1.0e-3 # relative ...
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amax: 1.0e+10 # absolute upper-limit of RGC residuum (in Pa)
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rmax: 1.0e+2 # relative ...
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perturbpenalty: 1.0e-7 # perturbation for computing penalty tangent
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relevantmismatch: 1.0e-5 # minimum threshold of mismatch
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viscositypower: 1.0e+0 # power (sensitivity rate) of numerical viscosity in RGC scheme
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viscositymodulus: 0.0e+0 # stress modulus of RGC numerical viscosity (zero = without numerical viscosity)
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# suggestion: larger than the aTol_RGC but still far below the expected flow stress of material
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refrelaxationrate: 1.0e-3 # reference rate of relaxation (about the same magnitude as straining rate, possibly a bit higher)
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maxrelaxationrate: 1.0e+0 # threshold of maximum relaxation vector increment (if exceed this then cutback)
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maxvoldiscrepancy: 1.0e-5 # maximum allowable relative volume discrepancy
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voldiscrepancymod: 1.0e+12
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discrepancypower: 5.0
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2020-07-09 15:56:35 +05:30
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generic:
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2020-09-30 14:23:05 +05:30
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subStepMin: 1.0e-3 # minimum (relative) size of sub-step allowed during cutback in homogenization
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subStepSize: 0.25 # size of substep when cutback introduced in homogenization (value between 0 and 1)
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stepIncrease: 1.5 # increase of next substep size when previous substep converged in homogenization (value higher than 1)
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nMPstate: 10 # materialpoint state loop limit
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2020-07-09 15:56:35 +05:30
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2023-07-17 21:33:31 +05:30
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solver:
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grid:
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N_staggered_iter_max: 10 # max number of field level staggered iterations
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N_cutback_max: 3 # maximum cut back level (0: 1, 1: 0.5, 2: 0.25, etc)
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damage:
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N_iter_max: 100 # maximum iteration number
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eps_abs_phi: 1.0e-2 # absolute tolerance for damage evolution
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eps_rel_phi: 1.0e-6 # relative tolerance for damage evolution
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thermal:
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N_iter_max: 100 # maximum iteration number
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eps_abs_T: 1.0e-2 # absolute tolerance for thermal equilibrium
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eps_rel_T: 1.0e-6 # relative tolerance for thermal equilibrium
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mechanical:
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eps_abs_div(P): 1.0e-4 # absolute tolerance for fulfillment of stress equilibrium
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eps_rel_div(P): 5.0e-4 # relative tolerance for fulfillment of stress equilibrium
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eps_abs_P: 1.0e3 # absolute tolerance for fulfillment of stress BC
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eps_rel_P: 1.0e-3 # relative tolerance for fulfillment of stress BC
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N_iter_min: 1 # minimum iteration number
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N_iter_max: 100 # maximum iteration number
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update_gamma: false # Update Gamma-operator with current dPdF (not possible if memory_efficient=1)
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FFT:
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memory_efficient: True # Precalculate Gamma-operator (81 double per point)
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divergence_correction: size+grid # Use size-independent divergence criterion
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derivative: continuous # Approximation used for derivatives in Fourier space
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FFTW_plan_mode: FFTW_MEASURE # planing-rigor flag, see manual on www.fftw.org
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FFTW_timelimit: -1.0 # timelimit of plan creation for FFTW, see manual on www.fftw.org. -1.0: disable timelimit
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PETSc_options: -snes_type ngmres -snes_ngmres_anderson # PETSc solver options
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alpha: 1.0 # polarization scheme parameter 0.0 < alpha < 2.0. alpha = 1.0 ==> AL scheme, alpha = 2.0 ==> accelerated scheme
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beta: 1.0 # polarization scheme parameter 0.0 < beta < 2.0. beta = 1.0 ==> AL scheme, beta = 2.0 ==> accelerated scheme
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eps_abs_curl(F): 1.0e-10 # absolute tolerance for fulfillment of strain compatibility
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eps_rel_curl(F): 5.0e-4 # relative tolerance for fulfillment of strain compatibility
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2020-07-09 15:56:35 +05:30
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mesh:
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2020-09-30 14:23:05 +05:30
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maxCutBack: 3 # maximum cut back level (0: 1, 1: 0.5, 2: 0.25, etc)
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maxStaggeredIter: 10 # max number of field level staggered iterations
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2020-07-09 15:56:35 +05:30
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structorder: 2 # order of displacement shape functions (when mesh is defined)
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2020-09-30 14:23:05 +05:30
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bbarstabilisation: false
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2020-07-09 15:56:35 +05:30
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integrationorder: 2 # order of quadrature rule required (when mesh is defined)
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itmax: 250 # Maximum iteration number
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itmin: 2 # Minimum iteration number
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eps_struct_atol: 1.0e-10 # absolute tolerance for mechanical equilibrium
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eps_struct_rtol: 1.0e-4 # relative tolerance for mechanical equilibrium
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2020-09-30 14:23:05 +05:30
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2020-07-09 15:56:35 +05:30
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crystallite:
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subStepMin: 1.0e-3 # minimum (relative) size of sub-step allowed during cutback in crystallite
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subStepSize: 0.25 # size of substep when cutback introduced in crystallite (value between 0 and 1)
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stepIncrease: 1.5 # increase of next substep size when previous substep converged in crystallite (value higher than 1)
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subStepSizeLp: 0.5 # size of first substep when cutback in Lp calculation
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subStepSizeLi: 0.5 # size of first substep when cutback in Li calculation
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nState: 10 # state loop limit
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nStress: 40 # stress loop limit
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rtol_State: 1.0e-6 # relative tolerance in crystallite state loop (abs tol provided by constitutive law)
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rtol_Stress: 1.0e-6 # relative tolerance in crystallite stress loop (Lp residuum)
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atol_Stress: 1.0e-8 # absolute tolerance in crystallite stress loop (Lp residuum!)
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integrator: FPI # integration method (FPI = Fixed Point Iteration, Euler = Euler, AdaptiveEuler = Adaptive Euler, RK4 = classical 4th order Runge-Kutta, RKCK45 = 5th order Runge-Kutta Cash-Karp)
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iJacoLpresiduum: 1 # frequency of Jacobian update of residuum in Lp
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commercialFEM:
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unitlength: 1 # physical length of one computational length unit
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generic:
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random_seed: 0 # fixed seeding for pseudo-random number generator, Default 0: use random seed.
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2022-11-24 15:53:10 +05:30
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phi_min: 1.0e-6 # non-zero residual damage.
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