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.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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