Hi Professor Bangerth, Thanks for the quick reply! According to your guidance, I found more useful posts about this topic and finally I referenced the heat flux example and got it work.
By the way, I really appreciate you guys' work on the dealii package. It's a great FEA tool! Best, Baoyun Ge On Thursday, July 20, 2017 at 6:16:39 PM UTC-5, Wolfgang Bangerth wrote: > > On 07/20/2017 04:23 PM, Baoyun Ge wrote: > > > > I am using dealii to solve the electrostatic field governed by Laplace's > > equation. Right now I have the solution vector, which contains the > electrical > > potential information throughout all the degrees of freedom. I am stuck > at the > > post processing phase, where I want to evaluate the charges on the > electrodes. > > The way I am seeking it is in two steps: > > > > 1) evaluating electric field using the electrical potential information; > > 2) integrating electric field over the surface enclosing the electrode > under > > consideration (Gauss's Law). > > > > Unfortunately, I haven't found too much useful information to guide me > to > > accomplish these two steps. Any information and guidance from you guys > would > > be appreciated! > > Baoyun, the electrical field is just the gradient of the potential, so > this is > easy to evaluate via FEValues::get_function_gradients(). For the > integration, > what surface do you want to integrate over? Any surface? A surface that is > composed of faces of cells? The former is difficult, the latter easy to > achieve with the FEFaceValues class. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
