Results of symmetry based model - can we convert them to full model?
Dear experts,
I’m working on a thermo-mechanical simulation of some power electronics
device. The loading is a thermal cycle with different dwell/ramp times. The
problem is highly non-linear. ANSYS Classic 2020R1 is being used.
Due to the symmetry of the problem, instead of building a model of the full
structure, I already created a symmetrical 1/4 model (with about 240K
elements) of the this structure. However, for validation purposes, we are
hoping to compare FEA transverse displacements results with those of the
experiments (digital image correlation- DIC) at different time instances.
I realize that comparing 1/4 FEA model to full structure DIC results won’t
be so beautiful. I mean, comparing an image of 1/4 model to a DIC image of
the full structure would be little uncomfortable.
Anyway, does ANSYS, in some graphical way, provide a mirroring option of
the results? Or, can I mirror the contour plots of the quarter model
“twice” to get them for a full model? That would be great!
I’m aware that a full model can be easily generated and solved. A couple of
VSYMM commands will do but I don’t want to execute very lengthy simulations
(240K times 4 = about 1M elements) as I have many cases to consider.
I hope that the description of the matter is clear.
Your suggestions/comments are highly appreciated.
Best,
Mohammad
—
Mohammad A Gharaibeh, PhD
Visiting Research Scientist
Institute of Microsystems Engineering
University of Freiburg
Germany
--
---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348
---====
On Jul 17, 2022, at 10:39 PM, Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org wrote:
Anyway, does ANSYS, in some graphical way, provide a mirroring option of
the results? Or, can I mirror the contour plots of the quarter model
“twice” to get them for a full model? That would be great!
Symmetry works great providing your geometry and loading are both symmetric. Is that the case? If one or the other isn't symmetric, then symmetric boundary conditions will be inescapably wrong. Check the 'help' instructions for the command syntax
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
| John Sedgwick, Spotsylvania (1864)
Mohammad,
Yes, Ansys classic has a command to do exactly what you want.
Look at the documentation for the /EXPAND command.
Keith DiRienz
FEA Technologies
Dana Point, CA
On 7/17/2022 8:39 PM, Mohammad Gharaibeh via Xansys wrote:
Dear experts,
I’m working on a thermo-mechanical simulation of some power electronics
device. The loading is a thermal cycle with different dwell/ramp times. The
problem is highly non-linear. ANSYS Classic 2020R1 is being used.
Due to the symmetry of the problem, instead of building a model of the full
structure, I already created a symmetrical 1/4 model (with about 240K
elements) of the this structure. However, for validation purposes, we are
hoping to compare FEA transverse displacements results with those of the
experiments (digital image correlation- DIC) at different time instances.
I realize that comparing 1/4 FEA model to full structure DIC results won’t
be so beautiful. I mean, comparing an image of 1/4 model to a DIC image of
the full structure would be little uncomfortable.
Anyway, does ANSYS, in some graphical way, provide a mirroring option of
the results? Or, can I mirror the contour plots of the quarter model
“twice” to get them for a full model? That would be great!
I’m aware that a full model can be easily generated and solved. A couple of
VSYMM commands will do but I don’t want to execute very lengthy simulations
(240K times 4 = about 1M elements) as I have many cases to consider.
I hope that the description of the matter is clear.
Your suggestions/comments are highly appreciated.
Best,
Mohammad
—
Mohammad A Gharaibeh, PhD
Visiting Research Scientist
Institute of Microsystems Engineering
University of Freiburg
Germany
Yes, the problem is symmetric in terms of geometry, loading and boundary
conditions.
I am not questioning the fidelity of the analysis as I am just looking for
away to generate results of full model from a symmetry-based model.
Thanks!
--
---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348
---====
Keith, you are the man!
This is exactly what I am looking for. Thank you very much!
On Monday, July 18, 2022, Keith DiRienz fea-technologies@cox.net wrote:
Mohammad,
Yes, Ansys classic has a command to do exactly what you want.
Look at the documentation for the /EXPAND command.
Keith DiRienz
FEA Technologies
Dana Point, CA
—
Mohammad A Gharaibeh, PhD
Visiting Research Scientist
Institute of Microsystems Engineering
University of Freiburg
--
---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348
---====
On Jul 17, 2022, at 11:44 PM, Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org wrote:
Yes, the problem is symmetric in terms of geometry, loading and boundary
conditions.
I am not questioning the fidelity of the analysis as I am just looking for
away to generate results of full model from a symmetry-based model.
Even though the results will be identical? (—again, provided both the loading and the geometry are truly symmetric.)
If you really want to show both halves you can use graphics software to generate a flipped plot of your results and move the two halves together, but it seems like a waste of time.
Christopher Wright P.E. (ret'd) |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
http://www.skypoint.com/members/chrisw/ | John Sedgwick, Spotsylvania (1864)
Please check the /EXPAND command, if you are working in Mechanical workbench check this video https://www.youtube.com/watch?v=RETzoXbbwBA. Please note this is s beta feature .
From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Monday, July 18, 2022 10:14 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [Xansys] Re: Results of symmetry based model - can we convert them to full model?
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[External Sender]
Yes, the problem is symmetric in terms of geometry, loading and boundary
conditions.
I am not questioning the fidelity of the analysis as I am just looking for
away to generate results of full model from a symmetry-based model.
Thanks!
--
---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348
---====
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