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Periodic Boundary conditions.

Posted 28 gen 2013, 14:41 GMT-5 Modeling Tools & Definitions, Structural Mechanics 4 Replies

Agus Chicha
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Hi, I’m trying to use periodic boundary conditions to implement asymptotic homogenization of solid mechanics in 2D. The problem is that I have to use periodic boundary conditions but in some cases, I need to add a displacement on one component.
Something like this:
u1-u2=cte
v1-v2=0 (this condition is the usual of periodic condition in comsol)
where u and v represent the displacement on x and y respectively and 1 and 2 the opposites sides of a square

Is there any way to do this using periodic boundary conditions or another one?

Regards
Agustin
4 Replies Last Post 22 giu 2017, 10:29 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 28 gen 2013, 15:21 GMT-5
H

you could try to turn on the equation view (preferences) and tweak the internal COMSOL formulas, but this usually needs some good testing and validation to be sure its correct and do not interfere with other items/variables

--
Good luck
Ivar
H you could try to turn on the equation view (preferences) and tweak the internal COMSOL formulas, but this usually needs some good testing and validation to be sure its correct and do not interfere with other items/variables -- Good luck Ivar
Agus Chicha
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Posted: 1 decade ago 28 gen 2013, 16:16 GMT-5
Ivar, thanks for your rapid response. That seems to work.
Ivar, thanks for your rapid response. That seems to work.
Amen Tognevi
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Posted: 1 decade ago 24 nov 2014, 06:58 GMT-5
It is working
It is working
Amira Elayeb
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Posted: 7 years ago 22 giu 2017, 10:29 GMT-4
Hey
I set a Periodic boundary conditions (pressure : 1e2 Pa ) in the flow direction Y and my model is in microfluids domain to represent a fibrous layerd media using a representative volume elementary (unit cell ,a bloc ) in the other dirctions ( the last 4 faces ) i set 0 in the periodic boundary conditions . i set a normal meshing by defaut to test the convergence of the solution but no resulats there is every time an error plz help me !
Hey I set a Periodic boundary conditions (pressure : 1e2 Pa ) in the flow direction Y and my model is in microfluids domain to represent a fibrous layerd media using a representative volume elementary (unit cell ,a bloc ) in the other dirctions ( the last 4 faces ) i set 0 in the periodic boundary conditions . i set a normal meshing by defaut to test the convergence of the solution but no resulats there is every time an error plz help me !

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