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<DIV><FONT face=Arial>Hello,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I have difficulties to understand the meaning of following
equations for handling stranded inductors in an Av-formulation.</FONT></DIV>
<DIV><FONT face=Arial>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial> Equation
{<BR> Galerkin { [ - Ns[]/Sc[] * Dof{ir} , {a}
] ; In DomainB_Mag ; ...}<BR> Galerkin {
DtDof [ Ns[]/Sc[] * Dof{a} , {ir} ] ; In DomainB_Mag ;
...}<BR> Galerkin { [
Ns[]*Ns[]/(Sc[]*Sc[])/sigma[] * Dof{ir} , {ir} ] ; ...
}<BR> GlobalTerm { [ Dof{Ub} , {Ib} ] ; In
DomainB_Mag ; }<BR> }</FONT><FONT face=Arial><FONT
size=+0></DIV></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>These equations are copied from the getdp-mailinglist
message 'Questions about GetDP - Valparaiso - Chile', July 27 2000.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I tried to verify these equations. </FONT><FONT
face=Arial>According to chapter 3 in C. Geuzaines thesis I started from the
magnetodynamic h-formulation:</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>d/dt[mu*h,h'] + [1/sigma*rot h,rot h'] + [1/sigma*js,rot
h'] + <n x e,h'> = 0</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>and expressed it in terms of the magnetic vector potential
a (b = rot a), with test functions hsi (rot hsi = jsi, with jsi the unit current
density in each winding of the stranded inductor):</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>d/dt[a,jsi] + Ii*(1/sigma*jsi,jsi) + Vi = 0</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>With Ii the current through the stranded inductor and Vi
the voltage over the stranded inductor.</FONT></DIV>
<DIV><FONT face=Arial>How does this equation correspond to the equations
formulated in GetDP? Sorry if this seems a straightforward question but I am not
a finite element specialist.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Thanks in advance for helping,</FONT></DIV>
<DIV><FONT face=Arial>Kristof Geldhof</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>--<BR>ir. Kristof Geldhof<BR>Electrical Energy
Laboratory (EELAB)<BR>Dept. of Electrical Energy, Systems and Automation
(EESA)<BR>Ghent University (TW08)<BR>Sint-Pietersnieuwstraat 41, B-9000 Ghent -
Belgium<BR>Phone: +32 9 264 34 42, Fax.: +32 9 264 35 82<BR><A
href="mailto:kristof.geldhof@ugent.be">kristof.geldhof@ugent.be</A><BR><A
href="http://www.eesa.ugent.be/">http://www.eesa.ugent.be/</A></FONT></DIV></BODY></HTML>