# [Getdp] Problem with induction heat geometry

Matti Pellikka matti.pellikka at tut.fi
Sun Feb 3 15:02:47 CET 2013

```Hi, I've updated indheat.pro at
http://onelab.info/wiki/Magnetodynamics_with_cohomology_conditions
with coupled thermal analysis.
It first solves the time harmonic eddy currents in the workpiece and
then uses the heat generated by them as heat source for a transient
heat conduction problem. As boundary conditions, there are both
convection and radiation heat transfer terms present. To solve it, run
the command

getdp indheat.pro -solve TheDyn -pos TheDyn

--
Matti Pellikka, Researcher
Tampere University of Technology, Electromagnetics

On 3 February 2013 13:56, Matti Pellikka <matti.pellikka at tut.fi> wrote:
> Hi Stefan,
>
> On 3 February 2013 01:41,  <stefan.braun at smartcae.de> wrote:
>> Hi Matti,
>> i have two additionally questions to the example.
>> If i change the frequence from 50 to 5000 Hz i see no real skin effect.
>> Could it be possible that the mesh is not fine enough?
>
> Yes, you should have a couple of finite element layers per skin depth.
> In this case, about ten times more elements in the radial direction
> ...
>
>> My second questions is, how is it possible to integrate the temperature and
>> the nonlinear mu curve.
>> If found an example in the group
>>
>> http://www.geuz.org/pipermail/getdp/2000/000111.html
>> http://geuz.org/pipermail/getdp/2000/000125.html
>>
>> but the attachment of the working file in 000125.html is missing.
>>
>
> For nonlinear mu curve you can study the example at
> getdp, password: getdp). With nonlinearity however, the eddy current
> problem is no longer strictly time harmonic. Transient analysis should
>
> https://geuz.org/trac/getdp/wiki/ChainedResolutions is a simple
> example how to couple two problems, for example thermal and magnetic.
>
>>
>> Thank you very much for your help.
>> Best regards,
>> Stefan Braun
>>
>>
>>
>
> --
>
> Matti Pellikka, Researcher
> Tampere University of Technology, Electromagnetics
>
>>
>>
>>
>>
>>
>> On Tuesday, January 29, 2013 11:53:49 PM UTC+1, stefan... at smartcae.de wrote:
>>>
>>> Hi Matti,
>>> thank you for your help. Now it works.
>>> Best regards,
>>> Stefan Braun
>>>
>>> SmartCAE, Munich
>>>
>>> On Tuesday, January 29, 2013 5:03:18 PM UTC+1, Matti Pellikka wrote:
>>>>
>>>> Hi,
>>>>
>>>> I was able to reproduce the issue with the latest nightly build on 64
>>>> bit Windows 7. I'm investigating the issue, but as a temporary fix,
>>>> running the mesher from Windows Command Prompt seems to work.
>>>>
>>>> Open the Windows Command Prompt and go to the directory where both
>>>> gmsh.exe and indheat.geo are. Run the command:
>>>>
>>>> gmsh indheat.geo -3
>>>>
>>>> This creates the mesh file indheat.msh, which you can examine normally
>>>> using the graphical interface of Gmsh. To solve the induction heating
>>>> problem, have getdp.exe, indheat.pro and indheat.msh in the same
>>>> directory and in that directory run in the Command Prompt the command
>>>>
>>>> getdp indheat.pro -solve MagDynTOComplex -pos MagDynTO
>>>>
>>>> You can examine the resulting .pos files using the graphical interface of
>>>> Gmsh.
>>>>
>>>> Best regards,
>>>>
>>>> --
>>>> Matti Pellikka, Researcher
>>>> Tampere University of Technology, Electromagnetics
>>>>
>>>>
>>>> On 29 January 2013 13:12,  <stefan... at smartcae.de> wrote:
>>>> > Hello Matti,
>>>> > thank you very much for your help.
>>>> > I tried the new build 2.6.2 gmesh and the bulid of getdp 2.2.2 and i
>>>> > come
>>>> > little bit further.
>>>> > I have no error messages and the mesher starts.
>>>> > When the mesher reaches reducing cell complex the mesher crashes.
>>>> > Do you have any idea how to solve this problem,
>>>> > Thank you very much,
>>>> >
>>>> > Best regards,
>>>> > Stefan Braun
>>>> >
>>>> > SmartCAE, Munich
>>>> >
>>>> > On Monday, January 28, 2013 10:02:52 AM UTC+1, Matti Pellikka wrote:
>>>> >>
>>>> >> Hi Stefan,
>>>> >>
>>>> >> The cohomology computation commands on those lines didn't make it to
>>>> >> the current release version 2.6.1 of Gmsh. However, those commands
>>>> >> should be available in tomorrow's nightly builds of the development
>>>> >> version.
>>>> >>
>>>> >> Alternatively, you can compile the current development version by
>>>> >> yourself, check that the build option ENABLE_KBIPACK is ON to enable
>>>> >> the cohomology computation.
>>>> >>
>>>> >> I suspect that you also need the latest development version of GetDP
>>>> >> to compute the example.
>>>> >>
>>>> >> --
>>>> >> Matti Pellikka, Researcher
>>>> >> Tampere University of Technology, Electromagnetics
>>>> >>
>>>> >> On 27 January 2013 00:57,  <stefan... at smartcae.de> wrote:
>>>> >> > Hello Group Members,
>>>> >> > i want to try out a example of onelab.info about induction heating.
>>>> >> >
>>>> >> > If i import the *.geo file in gmsh i get the following error
>>>> >> > messages.
>>>> >> >
>>>> >> >
>>>> >> > http://onelab.info/files/getdp/Magnetodynamics/GMSH_GETDP/indheat.geo
>>>> >> >
>>>> >> >
>>>> >> > Info    : Reading 'C:\...\indheat.geo'...
>>>> >> > Info    : Starting subloop 1 in Line Loop 543 (are you sure about
>>>> >> > this?)
>>>> >> > Error   : 'C:\...\indheat.geo', line 176 : syntax error (()
>>>> >> > Error   : 'C:\...\indheat.geo', line 177 : syntax error (()
>>>> >> > Error   : 'C:\...\indheat.geo', line 186 : syntax error (()
>>>> >> > Error   : 'C:\...\ndheat.geo', line 187 : syntax error (()
>>>> >> >
>>>> >> >
>>>> >> >
>>>> >> > Thank you very much help on this problem.
>>>> >> > Best regards,
>>>> >> > Stefan Braun
>>>> >> >
>>>> >> > SmartCAE, Munich
>>>> >> >
>>>> >> > _______________________________________________
>>>> >> > getdp mailing list
>>>> >> > ge... at geuz.org
>>>> >> > http://www.geuz.org/mailman/listinfo/getdp
>>>> >> >
>>>> >>
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>>
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```