# [Getdp] How to define a discontinuous interface condition

michael.asam at infineon.com michael.asam at infineon.com
Fri Sep 6 09:20:21 CEST 2019

Hi,

there is an example in the old wiki showing how to implement a face conductivity,
so that there is a voltage jump across the face. Have a look here:
http://onelab.info/trac/getdp/wiki/FaceConduct2D

This example in the new wiki could also be interesting for you:
https://gitlab.onelab.info/doc/tutorials/wikis/Thermics
It is a thermal example with a contact resistance.

I hope this is of some help.

Best regards,
Michael

Von: getdp <getdp-bounces at ace20.montefiore.ulg.ac.be> Im Auftrag von Yuanzhi Zhu
Gesendet: Donnerstag, 5. September 2019 16:42
An: getdp at onelab.info
Betreff: [Getdp] How to define a discontinuous interface condition

Hello Everyone,

I have problem to define a Discontinuous Interface Condition. The basic structure is that there are two 3D cube 1 and 2 sharing a common interface and the 2D side view is like this:

-------------------------------

|         |         |

|    1    |     2   |

|         |         |

|         |         |

-------------------------------

For a static electric problem(laplace equation), given some boundary condition, and a interface resistance--which means that the potential does not continuous in the interface, I want to solve the potential phi.

The phsics at the interface should be \Delta phi \cdot \hat{n} = phi_1-phi_2, where \hat{n} is the normal vector of the interface and phi_1 and phi_2 are the value of potential phi at the interface(actually extremely closing to the interface) from cube 1 and cube 2, respectively.

The problem is that I donot know how to the describe this boundary as a formulation, and I have searched the archive of this mail-list but didnot get good information.

Can you give some suggestion on this kind of interface boundary condition?

Yuanzhi Zhu.

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