# [Getdp] Problem with induction heat geometry

stefan.braun at smartcae.de stefan.braun at smartcae.de
Mon Feb 4 00:35:59 CET 2013

```Hi Matti,
thank you very much for your help. Now i come a big step further.
I hope this is one of my last questions. Where i have to change the number
Thank you very much,
Best regards,
Stefan Braun

SmartCAE, Munich

On Sunday, February 3, 2013 3:02:47 PM UTC+1, Matti Pellikka wrote:
>
> 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.p... at tut.fi <javascript:>>
> wrote:
> > Hi Stefan,
> >
> > On 3 February 2013 01:41,  <stefan... at smartcae.de <javascript:>> 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.dewrote:
> >>>
> >>> 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
> >>>> >> > 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
> >>>> >> >
> >>>> >>
> >>>> >> _______________________________________________
> >>>> >> getdp mailing list
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> >>>>
> >>>> _______________________________________________
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> >>
> >>
> >> _______________________________________________
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> >>
>
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