MICRESS Forum

Dear all,

When automatic time stepping is enabled, the calculation sometimes fails to start, and the following message appears in the log file:
# Incompatible with automatic time-stepping!

Could you please explain the meaning and cause of this error?
Below is an example of the input code where the error occurred.

# Numerical parameters
# ====================
#
# Phase field solver
# ------------------
# Time-step ?
# Options: fix ...[s] automatic automatic_limited
automatic_limited
# Options: constant from_file
constant
# Limits: (real) min./s, [max./s], [time step factor], [segregation factor]
1.E-7 1.0
#Coefficient for phase-field criterion 1.00
#Coefficient for segregation criterion 0.900
#Number of steps to adjust profiles of initially sharp interfaces [exclude_inactive]?
100
# Type of potential?
# Options: double_obstacle multi_obstacle [no_fd_correction | fd_correction]
# Recommended: multi_obstacle fd_correction
multi_obstacle fd_correction
# Phase minimum?
1.00E-04
# Interface thickness (in cells)?
3.500000000000
# Coefficient for initial dimension of field iFace
# [minimum usage] [target usage]
0.15
# Coefficient for initial dimension of field nTupel
# [minimum usage] [target usage]
0.1
#
# Concentration solver
# --------------------
# Factor for diffusion time stepping? (0.0 < factor < 1.0)
0.9500000000000
# Optional parameters for thermodynamic definitions
# Finish input with 'end_of_options'.
# stoichiometric <phase> <component list>
# limits <phase> <component> <min (at%)> <max (at%)>
# penalty <phase> <phase 2> <component>
no_stoichio


Best regards,
Chika

Dear Chika,

a check of the nucleation check intervals causes this error message. The interval is too small and not compatible with your settings for automatic time stepping.
It makes me wondering that this error occurs. Could you also check what is really read in for the nucleation check intervals in the log file.
Lines in the nucleation section starting with: Time between checks for nucleation:

While restructuring the input, this message lost his context. We will make it more verbose.

Best,
Ralph

Dear Ralph,

I am grateful for your important suggestion.
Calculation worked well without errors by setting nucleation-check-intervals other than zero.

Best regards,
Chika