Grain Input

[VenkatesanJv]

Hi

I am the beginner for this software, I want to know how exactly the grain inputs are fixed; here is my code

# Number of grains at the beginning?
1
# Input data for grain number 1:
# Geometry?
# Options: round rectangular elliptic
rectangular
# Center x,z coordinates [micrometers], grain number 1?
0.00
0.00
# Length along x-axis [micrometers]
1
# Length along z-axis [micrometers]
1
# Should the Voronoi criterion?
# Options: voronoi no_voronoi
no_voronoi
# Phase number? (integer)
1

my doubt is : In the example it is given that,
# the origin of coordinate system is the bottom left-hand corner,
# all points within the simulation domain having positive coordinates
But am not getting result like this. so please explain me

[Bernd]

Dear VenkatesanJv,

Welcome to the MICRESS forum!

You say that you do not get what you expect from your grain input specification - is it that you do not get anything, i.e. you do not see the grain in the first output, or is the size different from what you expect?

If you do not get anything, one reason could be that the grid resolution is too low. To be sure to get something, the grid spacing has to be smaller than 0.5 micrometer, otherwise nothing may appear. Other possible reasons could be that you set a second grain afterwards which hides the first one, or that you have specified a too high number of steps to adjust profiles of the initially sharp interfaces (see Time Input Data). In the latter case, the particle would just vanish during initialisation due to its curvature!

If the size is not what you expect, please keep in mind that the length along the x/z axis is the total length, half of which is not visible because in your example it is outside the domain!

If you show the whole input file (most easily by pasting it into your post), I possibly can identify other reasons why it does not work in your case...

Best regards

Bernd

[VenkatesanJv]

Grain3.txt

(18.5 KiB) Downloaded 253 times

Dear Bernd

Thanks for your reply

Sir program is running good and also i can able to see the grain in the first output and the problem is size different

It was said that , a) the origin of coordinate system is the bottom left-hand corner,
b) all points within the simulation domain having positive coordinates
If the above statements are correct , my input values are also correct ,is it ?
because my domain is 3 x 3 micrometers, (30 x 1 x 30 : resolution 0.1 )
(0,0)coordinate axis and length 1 X 1 micrometers

Or if the origin of coordinate system is center means , i understood that my input values are outside the domain

Then explain me, for the program which i attached, here my question is why the full domain is not covered by austenite grain even though my input values are enough to cover the domain
(i.e) coordinates axis (1.5,1.5)
length 3 x 3 micrometers
Here am getting the liquid phase , why ?

Thanks

[Bernd]

Hi VenkatesanJv,

According to the input file which you attached:

# Input data for grain number 1:
# Geometry?
# Options: round rectangular elliptic
rectangular
# Center x,z coordinates [micrometers], grain number 1?
1.5
1.5
# Length along x-axis [micrometers]
3
# Length along z-axis [micrometers]
3
#

the domain should be exactly filled with grain 1. But please take into account that:

1.) the specified center position falls exactly on the boundary between two grid cells, i.e. it is a question of rounding on which side it falls, and
2.) the size again exactly reaches up to the boundary of two grid cells.

So, I would expect some "liquid" to appear close to the boundaries of the simulation domain.
But why don't you just define it a bit bigger if you want to cover the whole domain?

Best wishes

Bernd

[VenkatesanJv]

Dear Bernd

Now i understood , thanks for your valuable answers. And also i covered the whole domain by extending the values

Best Regards

Venkatesan J