[Getdp] Concatenation of field operators

[michael.asam at infineon.com]

Hi Thomas,

here comes the corrected file.

C.u.
Michael


-----Original Message-----
From: Thomas_W [mailto:e0208228 at student.tuwien.ac.at] 
Sent: Sunday, October 28, 2012 8:04 PM
To: Asam Michael (IFAG ATV BP PD 1 M1)
Cc: getdp at geuz.org
Subject: RE: [Getdp] Concatenation of field operators

Hi Michael,

we had u as discretized quantity, and wanted to evaluate |grad|grad u||.

I have tried your suggestion with the new quantity. I attach the files. The result is that the computed result is just zero everywhere.

Are there some other ideas how to compute the term?  - Probably, there is still a mistake in the files.

Thanks, in any event!
Thomas


Zitat von michael.asam at infineon.com:

> Hi Thomas,
>
> I think this cannot be done in the post-processing.
> Probably one solution would be to calculate the first gradient in the 
> Formulation{} part by adding a new quantity (e.g. dv) and do a kind of 
> protection:
>
> Formulation{
> ...
>   Galerkin { [ -Norm[{v}], {dv} ]; In All; Integration I1; Jacobian JVol;  }
>   Galerkin { [ Dof{dv}, {dv} ]; In All; Integration I1; Jacobian JVol;  
> } }
>
> You have to make sure that v has at least 2nd order basis functions in 
> order to be twice differentiable.
>
> I hope this works :-)
>
> Best regards
> Michael
>
>
>
>
>
> -----Original Message-----
> From: getdp-bounces at ace20.montefiore.ulg.ac.be
> [mailto:getdp-bounces at ace20.montefiore.ulg.ac.be] On Behalf Of 
> Thomas_W
> Sent: Monday, October 15, 2012 3:03 PM
> To: getdp at geuz.org
> Subject: [Getdp] Concatenation of field operators
>
> Dear all,
>
> I try to evaluate the following quantity in the Post-processing part, 
> where v is the discretized quantity:
> |Grad (|Grad (v)|)|.
>
> I tried variants such as:
>
> PostProcessing {
>    { Name The; NameOfFormulation f_v;
>      Quantity {
>        { Name jj;
>          Value{
>          Local{ [ {d  {d v}*{d v} } ] ; In All;Jacobian JVol; }
>          }
>        }
>      }
>    }
> }
>
> or also
> Local{ [ {d  {Norm[{v}]} } ] ; In All;Jacobian JVol; }.
>
> All these variants yield an error, namely 'syntax error ({)' in the 
> corresponding line. It probably has to do with the fact that only v, 
> and not Norm[{v}] is the original discretized quantity.
>
> Do you have a solution how to evaluate such a function with GetDP?
>
> Thank you,
> Thomas
>
>
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>
>


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