[Getdp] Surface charge/ normal electric field strength

Tammo Heeren Tammo.Heeren at ieee.org
Thu Oct 26 17:08:10 CEST 2006


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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