Search found 1143 matches

by Bernd
Mon Jul 06, 2020 7:03 pm
Forum: solid-solid phase transformations
Topic: Nucleation on selected grain boundaries
Replies: 6
Views: 646

Re: Nucleation on selected grain boundaries

Hi Billy, unfortunately, there is still no specific nucleation option in MICRESS which restricts nucleation to certain misorientation values... If you would have said you want to have nucleation only on ferrite-ferrite boundaries with >15° misorientation, this would be what I think is to be expected...
by Bernd
Mon Jun 29, 2020 10:39 am
Forum: post-processing
Topic: how to interpret TabP file
Replies: 1
Views: 31

Re: how to interpret TabP file

Hi jiwonp, Apart from the "CPU Time" which is the sum over the usage of all CPU's, all other columns show wallclock times (using the Fortran DATE_AND_TIME function). We do not distinguish the individual CPU's here because all parallel regions lie completely inside the individual timing blocks. The r...
by Bernd
Wed Jun 10, 2020 3:36 pm
Forum: thermodynamics
Topic: Driving force calculation for NPLE with TQ
Replies: 4
Views: 82

Re: Driving force calculation for NPLE with TQ

Hi Billy, let me answer point by point: 1) I confirm your formulation. For NPLE Mn must also be included, because NPLE implies local equilibrium. 2.) ΔG0 is determined by the parallel tangent construction. Numerically it is calculated in TQ as a dormant equilibrium with one phase with phase fraction...
by Bernd
Tue Jun 09, 2020 11:36 pm
Forum: thermodynamics
Topic: Driving force calculation for NPLE with TQ
Replies: 4
Views: 82

Re: Driving force calculation for NPLE with TQ

Hi Billy, Nice to hear that you are about to bring your thesis to a good end. Indeed, when considering multicomponent systems it is very confusing to use this type of diagram, because it is (without further assumptions) only valid for binary systems. I agree that, as you say in (1), ΔG is calculated...
by Bernd
Tue Jun 02, 2020 3:01 pm
Forum: solidification
Topic: Data for further nucleation
Replies: 64
Views: 8608

Re: Data for further nucleation

Hi Chamara, There is no way assuring a minimum distance of potential nucleation points - it would also be difficult to implement that, because it would not be compatible to freely choosing a radius-seed-density distribution. However, if you set the proper shield distance and a very long shield time,...
by Bernd
Tue Jun 02, 2020 10:23 am
Forum: solidification
Topic: Data for further nucleation
Replies: 64
Views: 8608

Re: Data for further nucleation

Hi Chamara, Yes, the potential seed positions are placed at the beginning of the simulation without taking care about the shield distance. However, at nucleation time, the shield distance between seeds of this type and with seeds from other seed types are checked in the same way as for other nucleat...
by Bernd
Mon May 18, 2020 10:07 am
Forum: solidification
Topic: Some questions about lat_heat
Replies: 5
Views: 268

Re: Some questions about lat_heat

Hi Ling, I think VAR is an example where you really should apply the Bridgman approximation, i.e. just take temperature trend and gradient from your macroscopic simulation. In VAR, similar as in Bridgman furnaces, you indeed have simultaneous heating and cooling which efficiently takes away effects ...
by Bernd
Thu May 14, 2020 4:36 pm
Forum: solidification
Topic: Some questions about lat_heat
Replies: 5
Views: 268

Re: Some questions about lat_heat

Hi Ling, For deciding which thermal boundary conditions should be used on the microscale it is important to have knowledge of the macroscopic problem. Heat diffusion appears on the length-scale of the macroscopic casting, while solute diffusion and curvature define the microstructural length scale. ...
by Bernd
Wed May 13, 2020 4:22 pm
Forum: solidification
Topic: Some questions about lat_heat
Replies: 5
Views: 268

Re: Some questions about lat_heat

Hi Ling, 1. You cannot control both, temperature and heat flow at the same time. If you specify temperature, latent heat cannot have any effect - apart from the net heat flow, which you can get as an output if you use "no_lat_heat_dsc". If you specify "lat_heat", then the assumption is that latent h...
by Bernd
Sun May 10, 2020 4:33 pm
Forum: solidification
Topic: Data for further nucleation
Replies: 64
Views: 8608

Re: Data for further nucleation

Hi Chamara, This is not true. If you use the seed density model (even if only with one single class), then "analytical_curvature" is active by default, and the size of your grains will always be small (i.e. one cell with 1.01 x phHys (with phHys=phMin x hysteresis factor). The radius which has been ...