PARADISCYL:Cylinder-bug: Difference between revisions
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(Created page with '= Bug in cylinder code : usage of cell= ==ILL RYU== ===May 1, 2010=== ParaDiS uses cells to compute stress. Now, if we use more than 3 cells, there are discontinuities near the …') |
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= Discontinuities in stress : usage of cell= |
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==ILL RYU== |
==ILL RYU== |
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===May 1, 2010=== |
===May 1, 2010=== |
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Blue line : 3 cells <br> |
Blue line : 3 cells without FMM<br> |
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Red line: 8 cells without FMM <br> |
Red line: 8 cells without FMM <br> |
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Green line: 8 cells with FMM <br> |
Green line: 8 cells with FMM <br> |
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=== Infinite stress === |
=== Infinite stress === |
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<gallery widths=" |
<gallery widths="800px" heights="600px" perrow="1"> |
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Image:Inf_cell_compare.jpg |
Image:Inf_cell_compare.jpg |
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</gallery> |
</gallery> |
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=== Image stress stress === |
=== Image stress stress === |
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<gallery widths=" |
<gallery widths="800px" heights="600px" perrow="1"> |
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Image:Img_cell_compare.jpg |
Image:Img_cell_compare.jpg |
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</gallery> |
</gallery> |
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=== Total stress === |
=== Total stress === |
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<gallery widths=" |
<gallery widths="800px" heights="600px" perrow="1"> |
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Image:Tot_cell_compare.jpg |
Image:Tot_cell_compare.jpg |
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</gallery> |
</gallery> |
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== Conclusion == |
== Conclusion == |
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Latest revision as of 00:11, 17 June 2010
Discontinuities in stress : usage of cell
ILL RYU
May 1, 2010
ParaDiS uses cells to compute stress. Now, if we use more than 3 cells, there are discontinuities near the boundary of cells. Here, 3 kinds of models are tested to see the discontinuities: Using 3 cells without FMM, Using 8 cells without FMM, Using 8 cells with FMM.
Model geometries
In the model, square dislocation loop is located at the center of the simulation domain as following figure.
![[cylinder_square]](/mediawiki/images/thumb/0/0b/Cylinder_square.jpg/386px-Cylinder_square.jpg)
[cylinder_square]
![[cylinder_square]](/wiki/File:Cylinder_square.jpg)
Blue line : 3 cells without FMM
Red line: 8 cells without FMM
Green line: 8 cells with FMM
Infinite stress
Image stress stress
Total stress
Conclusion
As we can see, if we use more that 3 cells for the stress calculation, the solutions are getting unstable.