Boundary Conditions

dendritic solidification, eutectics, peritectics,....
CharMIC
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Boundary Conditions

Post by CharMIC » Mon Dec 18, 2017 3:05 pm

Hej,

Would it be possible to define both time dependent cooling rates and time dependent thermal gradients in a single solidification simulation instead of a two fix values in MICRESS.

BR
Chamara

ralph
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Re: Boundary Conditions

Post by ralph » Mon Dec 18, 2017 3:31 pm

Use the option 'linear' or 'linear_from_file' in the temperature boundary section.
That way, you can define can define values for the temperature at the bottom and the gradient in Z-direction for each given point of time. In between the given values, it will be interpolated linearly.

Like this:
linear
2 ! number of connecting points
1.0 ! time pt. 1
960 ! temperature pt. 1
20 ! gradient pt. 1

and so on ...

Cheers,
Ralph

ralph
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Re: Boundary Conditions

Post by ralph » Mon Dec 18, 2017 3:33 pm

The file contains the values in columns:

# Time Temperature Z-Gradient
1.0 960 20
...

Ralph

CharMIC
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Re: Boundary Conditions

Post by CharMIC » Fri Apr 20, 2018 1:09 pm

Hej,

Can you also import X,Y,Z position dependent thermal profiles for a 3D simulation in MICRESS?

BR
Chamara

Bernd
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Re: Boundary Conditions

Post by Bernd » Fri Apr 20, 2018 1:14 pm

Hej,

Unfortunately, this is not possible at present. From the internal data structure, MICRESS accepts only temperature differences in z-direction when concentration coupling is used...

Bernd

CharMIC
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Re: Boundary Conditions

Post by CharMIC » Thu Jul 05, 2018 9:59 am

Hej,

I have question regarding 1D temperature profile in Z direction. I am doing some directional solidification simulation with time varying temperature profiles in Z direction. to reduced the computational time, I have reduced the domain size and use moving frame option. The question I have is will the temperatures be updated with respect to the correct height locations when the frame starts to move?

BR
Chamara

Bernd
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Re: Boundary Conditions

Post by Bernd » Thu Jul 05, 2018 6:08 pm

Hej Chamara,

No, this is not implemented like that, because it would be more complicated (although not impossible).
At present, unfortunately, the reference point is always the current bottom of the simulation domain...

A possible workaround:
You could use moving_frame with a fixed bottom temperature, and manually shift all profiles such that they start at the same temperature for z=0...

Bernd

CharMIC
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Re: Boundary Conditions

Post by CharMIC » Thu Jul 05, 2018 6:49 pm

Hej Bernd,

I did not understand the method you suggested. Could you explain a bit more with a simple example

BR
Chamara

Bernd
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Re: Boundary Conditions

Post by Bernd » Thu Jul 05, 2018 9:23 pm

Hej Chamara,

I think I was a bit fast with this method. It cannot work because there is no reason why the frame should move at all under such conditions :(

Bernd

CharMIC
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Re: Boundary Conditions

Post by CharMIC » Fri Jul 06, 2018 8:15 am

Hmmm.. thats a limitation then. But as you said it may be not difficult to implement?

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