[Getdp] Surface charge/ normal electric field strength

Kubicek Bernhard Bernhard.Kubicek at arsenal.ac.at
Mon Oct 30 09:05:00 CET 2006


Hello!
I tested once again with my windows machine, GetDP 1.2.1, and it seems to work here.
However, I have to admit that on the workinghorse linux machine, there is a small glitch:
If I pipe all output to a file (shell=bash, getdpsk is my self-compiled binary of the cvs version iirc):
>getdpsk platehole.pro -pre all -cal -pos all &> out.txt 
>cat out.txt
the values are in the back of the output:
---------
Operation : PostOperation 3/6
          > 'ne.pos'
Operation : PostOperation 4/6
Operation : PostOperation 5/6
Operation : PostOperation 6/6
Resources : cpu 0.292018 s
E n d   P o s t - P r o c e s s i n g
E n d
0  2.279748153101153e-09 -2.279748153101149e-09
0  100 0
0  2.279748153101153e-11 -inf
----------
Also, a while ago, while using binary mode (-bin), the screen output of simmilar numbers was _also_ binary. This tended to fill the screen with funny, but not quite helpfull ascii characters. I don't remember, but it could have occured with an older version, however it for sure was a windows machine. 

So anyway, what you could try, apart from testing with a different GetDP version, is the following:
---
        Print[Q, OnRegion Grouped, Format Table, File "q.pos"];
        Print[V, OnRegion Grouped, Format Table, File "v.pos"];
        Print[C, OnRegion Grouped, Format Table, File "c.pos"];
---
or
---
        Print[Q, OnRegion Grouped, Format Table, File "dis.pos"];
        Print[V, OnRegion Grouped, Format Table, File >"dis.pos"];
        Print[C, OnRegion Grouped, Format Table, File >"dis.pos"];
---
then by using "cat filename.pos" (linux) or "type filename.pos" (windows) you hopefully will get the following three lines:
--
0  2.279748153101153e-09 -2.279748153101149e-09
0  100 0
0  2.279748153101153e-11 -inf
--

nice greetings from Vienna, and good luck,
bernhard


-----Ursprüngliche Nachricht-----
Von: getdp-bounces at geuz.org [mailto:getdp-bounces at geuz.org] Im Auftrag von Tammo Heeren
Gesendet: Donnerstag, 26. Oktober 2006 17:08
An: getdp at geuz.org
Betreff: Re: [Getdp] Surface charge/ normal electric field strength


I have been trying to recreate the given problem and I found a somewhat
strange behavior.
As the postprocessing and postoperation I have:

PostProcessing {
{ Name all; NameOfFormulation for_v;
 Quantity {
{ Name v ;
 Value {
 Local { [ {v} ] ; In Vol ; Jacobian Vol; }
 }
}
{ Name e ;
 Value {
Local { [ {d v} ] ; In Vol ; Jacobian Vol; }
 }
}
{ Name ne ;
 Value {
Local { [ Norm[{d v}] ] ; In Vol; Jacobian Vol; }
 }
}
{ Name Q ; Value { Term { [ {Q} ] ; In Grouped ; } } }
{ Name V ; Value { Term { [ {V} ] ; In Grouped ; } } }
{ Name C ; Value { Term { [ {Q}/{V} ] ; In Grouped ; } } }
 }
}
}

PostOperation {
{ Name all ; NameOfPostProcessing all;
 Operation {
Print[ v, OnElementsOf Vol, File "v.pos" ] ;
Print[ e, OnElementsOf Vol, File "e.pos" ] ;
Print[ne, OnElementsOf Vol, File "ne.pos" ] ;
Print[ Q, OnRegion Grouped, Format Table] ;
Print[ V, OnRegion Grouped, Format Table] ;
Print[ C, OnRegion Grouped, Format Table] ;
 }
}
}

Which is essentially what is given in the wiki. However, my getdp output is:

GetDP : Loading : Processing data 'Y:\captest1.res'
GetDP : Info : Selected PostProcessing 'all'
GetDP : Info : Selected Mesh 'Y:\captest1.msh'
GetDP : Operation : PostOperation 1/6
GetDP : > 'Y:\v.pos'
GetDP : Info : Generate ExtendedGroup '_BF_Entity_9'
(GroupsOfNodesOf)
Info : Parsing file 'Y:\v.pos'
Info : Parsed file 'Y:\v.pos'
GetDP : Operation : PostOperation 2/6
GetDP : > 'Y:\e.pos'
Info : Parsing file 'Y:\e.pos'
Info : Parsed file 'Y:\e.pos'
GetDP : Operation : PostOperation 3/6
GetDP : > 'Y:\ne.pos'
Info : Parsing file 'Y:\ne.pos'
Info : Parsed file 'Y:\ne.pos'
GetDP : Operation : PostOperation 4/6
GetDP : Operation : PostOperation 5/6
GetDP : Operation : PostOperation 6/6
GetDP : Resources : cpu 0.296875 s
GetDP : E n d P o s t - P r o c e s s i n g
GetDP : E n d

No results are shown for PostOperation 4-6, and also no error message.
Everything else seems to work just fine. Anybody have any idea?

Tammo


On 17 Oct 2006 at 16:55, Kubicek Bernhard wrote:

> Hello Tammo,
> I tried to put together a nice example for capacity calculations in the Wiki just about 10 minutes ago.
> Hopefully this can help you with your goals.
>
> If there are no glitches, maybe somebody else would like to add them
> to the frontpage. At the moment the example is hiding here:
>
> http://www.geuz.org/getdp/wiki/Capacitor2D
>
> Nice greetings,
> Bernhard Kubicek
>
> freelancer for Arenal Research, Vienna, Austria
>
> -----Ursprüngliche Nachricht-----
> Von: getdp-bounces at geuz.org [mailto:getdp-bounces at geuz.org] Im Auftrag von Tammo Heeren
> Gesendet: Montag, 9. Oktober 2006 22:34
> An: getdp at geuz.org
> Betreff: [Getdp] Surface charge/ normal electric field strength
>
>
> How do I extract the surface charge density or the electric field
> normal to the
> surface from the solution I optained with getdp and gmsh. The surfaces are
> defined in gmsh a physical lines. My eventual goal is to compute the
> capacitance of this (and other geometries). Any suggestions?
>
> Tammo



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