Not getting any solidification

[CharMIC]

Hi deepu and Bernd,

Many thanks for the advises. My simulation is not isothermal. Is with thermal gradient (1000K/cm) and cooling rate (-500K/s).

I have looked the .driv out put. Close to the initial seeds I see a value of -6.2 J/cm3 after 0.01S. At this time the bottom temperature is 1605K (initial equlibrium at 1611K)

I also get following error

Intermediate output for t = 1.00000E-02 s
CPU-time: 377 s
Current phase-field solver time step = 8.67E-03 s
Average conc. of comp. 1 = 0.5799931 wt%
Average conc. of comp. 2 = 0.0000000 wt%
Average conc. of comp. 3 = 19.1001193 wt%
Average conc. of comp. 4 = 18.5003247 wt%
Average conc. of comp. 5 = 2.9498659 wt%
Average conc. of comp. 6 = 5.0394821 wt%
Average conc. of comp. 7 = 0.9099283 wt%
One-dimensional approximation from z = 505
Temperature at the bottom = 1605.0 K
Temperature gradient = 1000.00 K/cm
Updating of diffusion data from database...
complete relinearisation!
Relinearisation interface: LIQUID/FCC_L12 t=2.0000000E-02
trying hard phases 0 1 level: 3 zp= 958 error= 3

BR
Chamara

[deepumaj1]

Dear Chamara,
The negative value of driving force sounds good. But the 'trying hard' error comes after the output is generated at 0.01 sec. 'Trying hard' error can come due to multiple reasons. It could be due to bad numerical parameters or due to thermodynamic reasons. A good detailed investigation would require an analysis of your input file.

I would like to suggest one more workout before this stage. Try increasing the frequency of output during this 0.01 sec range and look for more clues. Lets say if it generates and output for 0.011sec or so, see for some hints in the output- Spreading of the interface or freckle patterns or positive driving force, etc. Assuming that you have taken care of the Thermodynamics, I have some more questions for you:
1. Is your mobility temperature dependent?

Deepu

[CharMIC]

Problem solved. It was some error in defining the thermodynamic data. Now the simulation is working.
Thanks for the help.

BR
Chamara