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boundary integration in podtprocessing
Posted Mar 10, 2010, 11:14 a.m. EST 4 Replies
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Dear all,
I have a simple question about comression simulation.
I have a cube in mechanical module.
I applied a prescribed displacement(in -y direction)as a boundary settings for upper boundary.
bottom boundary is fixed.
In Postprocessing/boundary integration I clicked on upper boundary and chose reaction force in y direction.
This reaction force has negative value!!!!!!!
How it can be that I press on cube and cube's reaction force is negative?
Thanks in advance,
Alex
I have a simple question about comression simulation.
I have a cube in mechanical module.
I applied a prescribed displacement(in -y direction)as a boundary settings for upper boundary.
bottom boundary is fixed.
In Postprocessing/boundary integration I clicked on upper boundary and chose reaction force in y direction.
This reaction force has negative value!!!!!!!
How it can be that I press on cube and cube's reaction force is negative?
Thanks in advance,
Alex
4 Replies Last Post Aug 11, 2010, 2:26 a.m. EDT
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Posted:
1 decade ago
Hi
I would expect that the reaction force sign is defined with respect to the surface normal = direction pointing "outwards" of the volume.
Therefore I find the signs rather coherent that way, but I agree it's a convention issue
Do you agree ?
Good luck
Ivar
I would expect that the reaction force sign is defined with respect to the surface normal = direction pointing "outwards" of the volume.
Therefore I find the signs rather coherent that way, but I agree it's a convention issue
Do you agree ?
Good luck
Ivar
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Posted:
1 decade ago
Hi Ivar,
of course it is but the problem is that in my case it works only in x and z directions.
It should be that reaction force directed according axes but this rule works only in x and z directions...
in y direction(where my prescribed displacement applied) it works in opposite way...
Thank you in advance,
Alex
of course it is but the problem is that in my case it works only in x and z directions.
It should be that reaction force directed according axes but this rule works only in x and z directions...
in y direction(where my prescribed displacement applied) it works in opposite way...
Thank you in advance,
Alex
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Posted:
1 decade ago
Hi Alex:
I am having a similar issue, I was wondering if you can help me. I am modeling the insertion of a probe into the a cube. The probe I am having in post processing is that using point evaluation on vertices or boundary integration on the probe boundaries, the reaction force is always zero (in the z-direction of insertion).
I am looking for the resistance force that the probe is experiencing during the insertion - this is the reaction force right?
Also, for those points on the surface of the cube that are not part of the geometry, I cannot do point evaluation of any parameters on those points, any idea why?
I am attaching a simple version of this simulation.
Thank you,
Joe
I am having a similar issue, I was wondering if you can help me. I am modeling the insertion of a probe into the a cube. The probe I am having in post processing is that using point evaluation on vertices or boundary integration on the probe boundaries, the reaction force is always zero (in the z-direction of insertion).
I am looking for the resistance force that the probe is experiencing during the insertion - this is the reaction force right?
Also, for those points on the surface of the cube that are not part of the geometry, I cannot do point evaluation of any parameters on those points, any idea why?
I am attaching a simple version of this simulation.
Thank you,
Joe
Attachments:
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi Ivar:
I am having a similar issue, I was wondering if you can help me. I am modeling the insertion of a probe into the a cube. The probe I am having in post processing is that using point evaluation on vertices or boundary integration on the probe boundaries, the reaction force is always zero (in the z-direction of insertion).
I am looking for the resistance force that the probe is experiencing during the insertion - this is the reaction force right?
Also, for those points on the surface of the cube that are not part of the geometry, I cannot do point evaluation of any parameters on those points, any idea why?
I am attaching a simple version of this simulation.
Thank you,
Joe
I am having a similar issue, I was wondering if you can help me. I am modeling the insertion of a probe into the a cube. The probe I am having in post processing is that using point evaluation on vertices or boundary integration on the probe boundaries, the reaction force is always zero (in the z-direction of insertion).
I am looking for the resistance force that the probe is experiencing during the insertion - this is the reaction force right?
Also, for those points on the surface of the cube that are not part of the geometry, I cannot do point evaluation of any parameters on those points, any idea why?
I am attaching a simple version of this simulation.
Thank you,
Joe
Attachments: