[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 
of elements in radial direction.
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 
> > https://geuz.org/trac/getdp/wiki/MagnetoStaticsNonLinear (username: 
> > getdp, password: getdp). With nonlinearity however, the eddy current 
> > problem is no longer strictly time harmonic. Transient analysis should 
> > be used instead. 
> > 
> > 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 
> 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 
> >>>> >> > 
> >>>> >> 
> >>>> >> _______________________________________________ 
> >>>> >> getdp mailing list 
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> >>>> 
> >>>> _______________________________________________ 
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> >> 
> >> 
> >> _______________________________________________ 
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> >> 
>
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