[Getdp] Electrokinetic - GetDP vs. Analytical Solution

michael.asam at infineon.com michael.asam at infineon.com
Mon Aug 6 11:55:18 CEST 2012

Hi Jochen,

sorry for the late response.
The deviation is due to an inadequate mesh-size because the characteristic
length varies linearly between the two electrodes, whereas the E field is
proportional to r^-2.
So the best is to use a field in Gmsh to specify the mesh size by
an equation, or in case of more complex geometries do adaptive meshing.

Please find attached a modification of your example for adaptive meshing.
As your geometry is axisymmetrical I've reduced it to 2D.
Just generate a mesh with Gmsh as usual and run GetDP. Do the post-
processing "GenerateAdaptionFile" and plot it in Gmsh.
There do a right click in the main window on the according view number
and choose "Apply As Background Mesh" and then mesh the geometry
once again.
With the adapted mesh size the result should be better.
For 3D the procedure should be similar.

I hope this is of some help.

Kind regards,

Michael Asam
Infineon Technologies AG
ATV BP PD1 M1, Munich

Infineon Technologies AG
Vorsitzender des Aufsichtsrats: Wolfgang Mayrhuber
Vorstand: Peter Bauer (Vorsitzender), Dominik Asam, Arunjai Mittal, Dr. Reinhard Ploss
Sitz der Gesellschaft: Neubiberg
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