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Remeshing a Deformed Mesh in 4.0a

Posted Mar 9, 2011, 5:46 p.m. EST Low-Frequency Electromagnetics, Heat Transfer & Phase Change, Geometry, Mesh Version 4.1, Version 5.0 17 Replies

aroth
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Hi,
I am simulating the heat transfer in biological tissue that has been compressed. First I apply a gravitational load, and next I want to run the heat transfer calculations on the deformed geometry. If I want to run the heat transfer part in a separate study, how do I specify the study to use the deformed geometry from the first study (structural mechanics)? Any help would be greatly appreciated!

Austin R
17 Replies Last Post Mar 31, 2016, 1:53 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 10, 2011, 12:59 a.m. EST
Hi

you need to store the study (stationary one) and have the next solver start from there. In v4.0a the manual control of the study nodes is tedious and slightly frustrating ;) you should seriously consider to update

--
Good luck
Ivar
Hi you need to store the study (stationary one) and have the next solver start from there. In v4.0a the manual control of the study nodes is tedious and slightly frustrating ;) you should seriously consider to update -- Good luck Ivar
aroth
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Posted: 1 decade ago Mar 10, 2011, 2:23 p.m. EST
Thanks Ivar. I am unable to upgrade to 4.1 at the moment. For 4.0a, do I just set the initial values to take from the solution of the previous study step? Thank you.

Austin
Thanks Ivar. I am unable to upgrade to 4.1 at the moment. For 4.0a, do I just set the initial values to take from the solution of the previous study step? Thank you. Austin
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 11, 2011, 1:30 a.m. EST
Hi

the advantage with v4.0 is that you need to delete regularly the solver sequence as it gets easily corrupted and then to rebuild it, you become hence this way a specialist on solver nodes, something I mostly do not use as the default of COMSOL is mostly OK, but then when you really need a custom settings, you are without experience on "how to"

To avoid loosing all your Results settings, make a dummy study and attach the results to this one then delete and rebuild your solver, populate it with initial conditions and reconnect the results node, a lot of time gained

--
Good luck
Ivar
Hi the advantage with v4.0 is that you need to delete regularly the solver sequence as it gets easily corrupted and then to rebuild it, you become hence this way a specialist on solver nodes, something I mostly do not use as the default of COMSOL is mostly OK, but then when you really need a custom settings, you are without experience on "how to" To avoid loosing all your Results settings, make a dummy study and attach the results to this one then delete and rebuild your solver, populate it with initial conditions and reconnect the results node, a lot of time gained -- Good luck Ivar
aroth
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Posted: 1 decade ago Mar 11, 2011, 4:03 p.m. EST
One last question. Should I be using the moving mesh physics for this or is it not necessary if I am manually setting the initial conditions as the solution to the solid mechanics portion? Thank you.

Austin
One last question. Should I be using the moving mesh physics for this or is it not necessary if I am manually setting the initial conditions as the solution to the solid mechanics portion? Thank you. Austin
Zoran Vidakovic, COMSOL COMSOL Employee

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Posted: 1 decade ago Mar 31, 2011, 10:17 a.m. EDT
Hi Austin

Have a look at the attached picture on how to remesh a deformed geometry and export to CAD or reuse it in a new model. This was done with version 4.1.

Best regards,
Zoran
Hi Austin Have a look at the attached picture on how to remesh a deformed geometry and export to CAD or reuse it in a new model. This was done with version 4.1. Best regards, Zoran
Richard Murray
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Posted: 1 decade ago Apr 11, 2011, 4:50 a.m. EDT
Thank you Zoran, very useful, I've been trying to find out how to do this for ages.
Richard
Thank you Zoran, very useful, I've been trying to find out how to do this for ages. Richard
Susant Patra
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Posted: 1 decade ago May 11, 2011, 9:19 p.m. EDT
Hi,

I have one question regarding using deformed mesh generated from solution 1 and use it in solution 2 as shown below: Is the model structure shown is the valid way of doing it or I HAVE to store it elsewhere and introduce it in a separate Model to do further analysis with deformed structure?

-----------------------------model structure that I have .........................................
MODEL1
........
......
physics1
physics 2
......
......
MESH
mesh1
deformed configuration (from mesh1)
mesh2

STUDY1
step1
step2 (I AM ASUMING THAT STEP 2 WILL USE DEFORMED MESH GENERATED FROM SOLUTION 1)

RESULTS
Dataset
solution1 (created deformed mesh by right clicking on solution 1)
solution2

.....



Hi, I have one question regarding using deformed mesh generated from solution 1 and use it in solution 2 as shown below: Is the model structure shown is the valid way of doing it or I HAVE to store it elsewhere and introduce it in a separate Model to do further analysis with deformed structure? -----------------------------model structure that I have ......................................... MODEL1 ........ ...... physics1 physics 2 ...... ...... MESH mesh1 deformed configuration (from mesh1) mesh2 STUDY1 step1 step2 (I AM ASUMING THAT STEP 2 WILL USE DEFORMED MESH GENERATED FROM SOLUTION 1) RESULTS Dataset solution1 (created deformed mesh by right clicking on solution 1) solution2 .....
Hadjar Hamid
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Posted: 1 decade ago Aug 31, 2011, 6:17 a.m. EDT
hallo,
I was trying to export the deformed configuration as CAD model (deformed structural mechanics under load, 3D) using your scheme in the 4.1 version, as I just have the 4.0 version, I don 't have deformed Configuration plug in.
please, do you know how to do this with 4.0?

Thanks in advance for your help,
looking forward to hear you soon,

Best,
Hamid
hallo, I was trying to export the deformed configuration as CAD model (deformed structural mechanics under load, 3D) using your scheme in the 4.1 version, as I just have the 4.0 version, I don 't have deformed Configuration plug in. please, do you know how to do this with 4.0? Thanks in advance for your help, looking forward to hear you soon, Best, Hamid
Patrik Kennes
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Posted: 1 decade ago Dec 2, 2011, 9:14 a.m. EST
Hello Zoran,

I also followed the workflow to remesh a deformed geometry as you indicated on your nice outline. It all worked well in version 4.1. But now I'm using 4.2a (4.2.1.134), and just repeating the same steps, I don't get the deformed geometry but a copy of the original geometry. Maybe this is a bug in this latest release?
Hello Zoran, I also followed the workflow to remesh a deformed geometry as you indicated on your nice outline. It all worked well in version 4.1. But now I'm using 4.2a (4.2.1.134), and just repeating the same steps, I don't get the deformed geometry but a copy of the original geometry. Maybe this is a bug in this latest release?
John B
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Posted: 1 decade ago Nov 8, 2012, 1:51 p.m. EST
I agree that this same thing is occurring in 4.3a -- e.g., the imported mesh is not the deformed mesh. Does anyone have an update as to how this should actually work in the newer versions? The workflow seems logical, and it would be nice to see it work OK.

John
I agree that this same thing is occurring in 4.3a -- e.g., the imported mesh is not the deformed mesh. Does anyone have an update as to how this should actually work in the newer versions? The workflow seems logical, and it would be nice to see it work OK. John
Adan Medina
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Posted: 1 decade ago Mar 23, 2013, 5:20 p.m. EDT
Hello Zoran,

I am also having the same issue with COMSOL 4.3. When I make the deformed mesh, it is the original geometry, not the deformed geometry. Any updates on this?

Thank you in advanced,

Adan
Hello Zoran, I am also having the same issue with COMSOL 4.3. When I make the deformed mesh, it is the original geometry, not the deformed geometry. Any updates on this? Thank you in advanced, Adan
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 24, 2013, 2:40 p.m. EDT
Hi

it could be that you need to turn on the solver "non-linear" geometries in the later versions, it's just a guess from my part as I'm not by my WS so I cannot check, but there was a change in the later versions on the way the spatial and material frame was handled (and from where)

--
Good luck
Ivar
Hi it could be that you need to turn on the solver "non-linear" geometries in the later versions, it's just a guess from my part as I'm not by my WS so I cannot check, but there was a change in the later versions on the way the spatial and material frame was handled (and from where) -- Good luck Ivar
Tom Long
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Posted: 1 decade ago Apr 11, 2013, 4:59 a.m. EDT
Thank you Zoran, that is exactly what I needed. However I tried that method and COMSOL 4.1 crashes with a java error when I try to solve the second step. Do you have a suggestion to get around this? I have attached the model and the crash log, if it helps.
Thank you Zoran, that is exactly what I needed. However I tried that method and COMSOL 4.1 crashes with a java error when I try to solve the second step. Do you have a suggestion to get around this? I have attached the model and the crash log, if it helps.
Tom Long
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Posted: 1 decade ago Apr 11, 2013, 7:54 a.m. EDT
To follow up on this post, I avoided the crashing by separating the two steps into completely separate COMSOL files. I hope that helps someone.
To follow up on this post, I avoided the crashing by separating the two steps into completely separate COMSOL files. I hope that helps someone.
Sanjoy Nandi
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Posted: 1 decade ago Jun 11, 2013, 5:16 a.m. EDT
I am trying to run a Joule heating effect simulation in 2D. The idea of the simulation is to dissolve the filament by Joule heating effect. I have introduced deformed geometry to dissolve the filament but in my simulation the edge of the filament cross the symmetry axis and show some warnings. I want to show stop the simulation when it touches the symmetry axis but I can’t control it using simulation time. On the other hand when the edge of the filament touches the symmetry axis the temperature should be room temperature in all domain as there is no current but currently, I am getting a temperature distribution. Any help will be highly appreciated.
I am trying to run a Joule heating effect simulation in 2D. The idea of the simulation is to dissolve the filament by Joule heating effect. I have introduced deformed geometry to dissolve the filament but in my simulation the edge of the filament cross the symmetry axis and show some warnings. I want to show stop the simulation when it touches the symmetry axis but I can’t control it using simulation time. On the other hand when the edge of the filament touches the symmetry axis the temperature should be room temperature in all domain as there is no current but currently, I am getting a temperature distribution. Any help will be highly appreciated.
Xiaochuan Xu
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Posted: 1 decade ago Oct 17, 2013, 3:58 p.m. EDT
I was able to export the deformed geometry as dxf file by following this topic. However, the dxf file cannot be opened by either autocad or linkcad. Anyone know why?
Thank you.
I was able to export the deformed geometry as dxf file by following this topic. However, the dxf file cannot be opened by either autocad or linkcad. Anyone know why? Thank you.
Maizuar Maizuar
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Posted: 8 years ago Mar 31, 2016, 1:53 a.m. EDT
Hi Ivar
I am simulating a reinforced concrete beam with settlement at supports. To model the settlement at one support, I used the deformed geometry and solid physics and performed stationary study. Then, I continued with "Data set---> Solution 1----> Remesh Deformed Configuration". However, I can not do Remesh Deformed Configuration because it said:

" Deformed configuration can only be created for solid geometries".

So, could you please give me an advise to solve the problem. Many thanks in advance.

Regards


Maizuar
Hi Ivar I am simulating a reinforced concrete beam with settlement at supports. To model the settlement at one support, I used the deformed geometry and solid physics and performed stationary study. Then, I continued with "Data set---> Solution 1----> Remesh Deformed Configuration". However, I can not do Remesh Deformed Configuration because it said: " Deformed configuration can only be created for solid geometries". So, could you please give me an advise to solve the problem. Many thanks in advance. Regards Maizuar

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