1D austenite-ferrite transformation
Posted: Fri Jul 08, 2022 2:59 am
Hi,
I am using the example file for austenite-ferrite transformation to simulate 1D phase transformation (see attached sample input file).
I am running two cases (1) with the grid size 1e-7 m (2) with grid size 1e-10 and both the cases have 500 points in the simulation domain and 10 points resolving the interface and all other parameters such as diffusivity/mobility are constant. In the latter case, the concentration profile (according to diffusion control transformation) does not develop as expected. However, if I turn on the fd_correction, it returns the composition profile and interface kinetics correctly. Can anyone explain what is the cause of incorrect dynamics for smaller grid spacing in the absence of fd_correction?
The input file corresponding to Case-II is attached and the parameters that were modified for Case-I can be seen below.
# Cell dimension (grid spacing in micrometers):
0.100000
# Time input data
linear_step 1e-3 10.0
# Grain input
# Type of grain positioning?
deterministic
# Number of grains at the beginning?
2
# Input data for grain number 1:
rectangular
# Center x,z coordinates [micrometers], grain number 1?
0.0000
0.0000
# Length along x-axis [micrometers]
1.000
# Length along z-axis [micrometers]
20.00
# Should the Voronoi criterion be applied?
no_voronoi
# Phase number? (integer)
1
# Input data for grain number 2:
rectangular
# Center x,z coordinates [micrometers], grain number 2?
0.000
30.00
# Length along x-axis [micrometers]
1.000
# Length along z-axis [micrometers]
40.0000
Thanks.
Best Regards,
Ayush
I am using the example file for austenite-ferrite transformation to simulate 1D phase transformation (see attached sample input file).
I am running two cases (1) with the grid size 1e-7 m (2) with grid size 1e-10 and both the cases have 500 points in the simulation domain and 10 points resolving the interface and all other parameters such as diffusivity/mobility are constant. In the latter case, the concentration profile (according to diffusion control transformation) does not develop as expected. However, if I turn on the fd_correction, it returns the composition profile and interface kinetics correctly. Can anyone explain what is the cause of incorrect dynamics for smaller grid spacing in the absence of fd_correction?
The input file corresponding to Case-II is attached and the parameters that were modified for Case-I can be seen below.
# Cell dimension (grid spacing in micrometers):
0.100000
# Time input data
linear_step 1e-3 10.0
# Grain input
# Type of grain positioning?
deterministic
# Number of grains at the beginning?
2
# Input data for grain number 1:
rectangular
# Center x,z coordinates [micrometers], grain number 1?
0.0000
0.0000
# Length along x-axis [micrometers]
1.000
# Length along z-axis [micrometers]
20.00
# Should the Voronoi criterion be applied?
no_voronoi
# Phase number? (integer)
1
# Input data for grain number 2:
rectangular
# Center x,z coordinates [micrometers], grain number 2?
0.000
30.00
# Length along x-axis [micrometers]
1.000
# Length along z-axis [micrometers]
40.0000
Thanks.
Best Regards,
Ayush