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The electrostatic problem is described by Laplace equation:<br>
div(-\epsilon grad v) = 0<br>
where v is the electric scalar potential (the electric field e=-grad
v).<br>
The equation to write in GetDP is the weak for of the Laplace
equation:<br>
\begin(equation)<br>
\int_\Omega \epsilon * grad v * grad v' d\Omega +<br>
\int_\Gamma n * d * v'= 0<br>
\end(equation)<br>
<br>
\Omega is the volume domain (Vol in your GetDP equation)<br>
\Gamma is the boundary of the domain, this surface integral is
implicit in your problem and equal to zero, so it is not written.<br>
<br>
v' is the basis function for v, in GetPD, we abuse the notation
calling it v and appears after the comma.<br>
the differential operator grad is written in a general way as d,
though you could also write Grad:<br>
Equation {<br>
Galerkin {[epsr[] * Dof {Grad v}, {Grad v}]; In Vol; Jacobian Vol;
Integration Int;}<br>
}<br>
<br>
Explaining the Global term is a bit more complicated. Have a look
at: <br>
P. Dular, W. Legros, and A. Nicolet, “Coupling of local and global
quantities in various finite element formulations and its
application to electrostatics, magnetostatics and magnetodynamics,”
IEEE Trans. Magn., vol. 34, no. 5, pp. 3078–3081, 1998.<br>
<br>
Anyway, you can begin without.<br>
<br>
Regards,<br>
Ruth<br>
<br>
<br>
<br>
<br>
On 10/05/11 18:46, Juliana Amâncio Malagoni wrote:
<blockquote
cite="mid:BANLkTikb343+XHK-7m7JSoBgq-h3H-+u_g@mail.gmail.com"
type="cite">Hi,<br>
<br>
In an electrostatic problem in the formulation of the exercise was
described in<br>
the following expression:<br>
<br>
Equation {<br>
Galerkin {[epsr[] * Dof {d v}, {d v}]; In Vol; Jacobian Vol;
Integration Int;}<br>
GlobalTerm {[Dof {Q-} / eps0, {V}]; In Grouped;}<br>
}<br>
<br>
I began studying the GetDP did not understand how to get this<br>
[epsr[] * Dof {d v} {d v}] and [-Dof {Q} / eps0, {V}].<br>
<br>
How to develop the equations in GetDP?<br>
GetDP solve various kinds of applications such as development.<br>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Dr. Ir. Ruth V. Sabariego
University of Liege, Dept. of Electrical Engineering & Computer Science,
Applied & Computational Electromagnetics (ACE),
phone: +32-4-3663737 - fax: +32-4-3662910 - <a class="moz-txt-link-freetext" href="http://ace.montefiore.ulg.ac.be/">http://ace.montefiore.ulg.ac.be/</a>
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