Search found 1505 matches
- Tue Oct 06, 2009 10:05 pm
- Forum: solidification
- Topic: Averaging of driving force
- Replies: 3
- Views: 2931
Re: Averaging of driving force
It is like you say: the local phase-field gradient is randomly rotated with a maximum amplitude of the given angle (in degrees), in 3d along three axes. This procedure is done for each interface cell independently, i.e. for each cell a complete path through the interface is calculated. There is no l...
- Tue Oct 06, 2009 8:24 pm
- Forum: solidification
- Topic: Averaging of driving force
- Replies: 3
- Views: 2931
Re: Averaging of driving force
Dear Nils, you are raising a difficult question about these "dG options" which are all "dirty" parameters in terms of a scientifically pure phase-field model. I already tried to explain part of your query in this thread , maybe you have already read it. The question which remains open is how to use ...
- Tue Oct 06, 2009 7:49 pm
- Forum: pre-processing
- Topic: concentration initilization
- Replies: 5
- Views: 4287
Re: concentration initilization
Hi, MICRESS is able to read the initial concentration fields either from an ASCII profile or a 2/3-dimensional ASCII array file. The input could e.g. look like that: # # Initial concentrations # ====================== # How shall initial concentrations be set? # Options: input equilibrium from_file ...
- Fri Oct 02, 2009 2:56 pm
- Forum: phase-field model
- Topic: 1d_temp
- Replies: 11
- Views: 14235
Re: 1d_temp
What is 1d_temp option and in which part of the driving file it appears? In a calculation domain, how nonlinear temperature gradient could be defined by “1d_temp” option? Which data each column of the file containing one-dimensional temperature field represents? Dear mtoloui, I just implemented a g...
- Mon Sep 28, 2009 10:01 pm
- Forum: phase-field model
- Topic: 1d_temp
- Replies: 11
- Views: 14235
Re: 1d_temp
Dear sunny, if you want to setup a simulation like e.g. the one illustrated by the "AlCu_Temp1d_dri" example, of course, you need physical parameters like the heat diffusivity and the thermal boundary conditions which correspond to your process. Furthermore, especially if phase transformations are s...
- Mon Sep 28, 2009 9:06 pm
- Forum: solidification
- Topic: One problem about latent heat
- Replies: 2
- Views: 4714
Re: One problem about latent heat
Dear sunny, the example you are referring to is probably from Version 5.3. From Version 5.4 we decided to calculate latent heat directly from the thermodynamic database used in the example which is much better and easier. Combining coupling to thermodynamic data with manual input of latent heat data...
- Thu Sep 17, 2009 4:03 pm
- Forum: phase-field model
- Topic: some numerical consequences
- Replies: 3
- Views: 2938
Re: some numerical consequences
Hi zhubq, I am a bit astonished that you really need 10 cells interface thickness to get a reasonable shrinkage of a sherical grain! Did you check whether there are other parameters which could cause the trouble? Did you try a smaller time step or a smaller phMin? If you wish you can paste or send t...
- Fri Sep 11, 2009 2:17 pm
- Forum: pre-processing
- Topic: Initial Microstructure
- Replies: 7
- Views: 4525
Re: Initial Microstructure
Yes, it should. I never tried it personally, but it should!
Bernd
Bernd
- Thu Sep 10, 2009 6:53 pm
- Forum: phase-field model
- Topic: some numerical consequences
- Replies: 3
- Views: 2938
Re: some numerical consequences
Dear zhubq, I know from test calculations in our house that the shrinkage of a circular grain by curvature worked well and gave the correct kinetics! Most probably, there are some parameters which are not properly set. Without seeing the driving file you used I can only suspect - I have two ideas wh...
- Thu Sep 10, 2009 5:54 pm
- Forum: pre-processing
- Topic: Initial Microstructure
- Replies: 7
- Views: 4525
Re: Initial Microstructure
No, you should not use the gradient condition for concentration in this case!
Bernd
Bernd