# Available numerical parameters # Case sensitive keys homogenization: mechanical: RGC: eps_abs_P: 1.0e+4 # absolute tolerance of RGC residuum (in Pa) eps_rel_P: 1.0e-3 # relative ... eps_abs_max: 1.0e+10 # absolute upper-limit of RGC residuum (in Pa) eps_rel_max: 1.0e+2 # relative ... Delta_a: 1.0e-7 # perturbation for computing penalty tangent relevant_mismatch: 1.0e-5 # minimum threshold of mismatch viscosity_exponent: 1.0e+0 # power (sensitivity rate) of numerical viscosity in RGC scheme viscosity_modulus: 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 dot_a_ref: 1.0e-3 # reference rate of relaxation (about the same magnitude as straining rate, possibly a bit higher) dot_a_max: 1.0e+0 # threshold of maximum relaxation vector increment (if exceed this then cutback) Delta_V_max: 1.0e-5 # maximum allowable relative volume discrepancy Delta_V_modulus: 1.0e+12 Delta_V_exponent: 5.0 solver: grid: N_staggered_iter_max: 10 # max number of field level staggered iterations N_cutback_max: 3 # maximum cut back level (0: 1, 1: 0.5, 2: 0.25, etc) damage: N_iter_max: 100 # maximum iteration number eps_abs_phi: 1.0e-2 # absolute tolerance for damage evolution eps_rel_phi: 1.0e-6 # relative tolerance for damage evolution thermal: N_iter_max: 100 # maximum iteration number eps_abs_T: 1.0e-2 # absolute tolerance for thermal equilibrium eps_rel_T: 1.0e-6 # relative tolerance for thermal equilibrium mechanical: eps_abs_div(P): 1.0e-4 # absolute tolerance for fulfillment of stress equilibrium eps_rel_div(P): 5.0e-4 # relative tolerance for fulfillment of stress equilibrium eps_abs_P: 1.0e3 # absolute tolerance for fulfillment of stress BC eps_rel_P: 1.0e-3 # relative tolerance for fulfillment of stress BC N_iter_min: 1 # minimum iteration number N_iter_max: 100 # maximum iteration number update_gamma: false # Update Gamma-operator with current dPdF (not possible if memory_efficient=1) FFT: memory_efficient: True # Precalculate Gamma-operator (81 double per point) divergence_correction: size+grid # Use size-independent divergence criterion derivative: continuous # Approximation used for derivatives in Fourier space FFTW_plan_mode: FFTW_MEASURE # planing-rigor flag, see manual on www.fftw.org FFTW_timelimit: -1.0 # timelimit of plan creation for FFTW, see manual on www.fftw.org. -1.0: disable timelimit PETSc_options: -snes_type ngmres -snes_ngmres_anderson # PETSc solver options alpha: 1.0 # polarization scheme parameter 0.0 < alpha < 2.0. alpha = 1.0 ==> AL scheme, alpha = 2.0 ==> accelerated scheme beta: 1.0 # polarization scheme parameter 0.0 < beta < 2.0. beta = 1.0 ==> AL scheme, beta = 2.0 ==> accelerated scheme eps_abs_curl(F): 1.0e-10 # absolute tolerance for fulfillment of strain compatibility eps_rel_curl(F): 5.0e-4 # relative tolerance for fulfillment of strain compatibility mesh: N_cutback_max: 3 # maximum cut back level (0: 1, 1: 0.5, 2: 0.25, etc) N_staggered_iter_max: 10 # max number of field level staggered iterations p_s: 2 # order of displacement shape functions (when mesh is defined) bbarstabilisation: false p_i: 2 # order of quadrature rule required (when mesh is defined) N_iter_max: 250 # Maximum iteration number eps_abs_div(P): 1.0e-10 # absolute tolerance for mechanical equilibrium eps_rel_div(P): 1.0e-4 # relative tolerance for mechanical equilibrium phase: mechanical: r_cutback_min: 1.0e-3 # minimum (relative) size of step allowed during cutback in phase state calculation r_cutback: 0.25 # factor to decrease size of step when cutback introduced in phase state calculation (value between 0 and 1) r_increase: 1.5 # factor to increase size of next step when previous step converged in phase state calculation eps_rel_state: 1.0e-6 # relative tolerance in phase state loop (abs tol provided by constitutive law) N_iter_state_max: 10 # state loop limit plastic: r_linesearch_Lp: 0.5 # factor to decrease the step due to non-convergence in Lp calculation eps_rel_Lp: 1.0e-6 # relative tolerance in Lp residuum eps_abs_Lp: 1.0e-8 # absolute tolerance in Lp residuum N_iter_Lp_max: 40 # stress loop limit for Lp f_update_jacobi_Lp: 1 # frequency of Jacobian update of residuum in Lp integrator_state: 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) eigen: r_linesearch_Li: 0.5 # factor to decrease the step due to non-convergence in Li calculation eps_rel_Li: 1.0e-6 # relative tolerance in Li residuum eps_abs_Li: 1.0e-8 # absolute tolerance in Li residuum N_iter_Li_max: 40 # stress loop limit for Li f_update_jacobi_Li: 1 # frequency of Jacobian update of residuum in Li commercialFEM: unitlength: 1 # physical length of one computational length unit generic: random_seed: 0 # fixed seeding for pseudo-random number generator, Default 0: use random seed. phi_min: 1.0e-6 # non-zero residual damage.