[Getdp] Question about force on magnets

[Ruth Vazquez Sabariego]

Dear Pablo Xavier,

The force is calculated by means of the Maxwell Stress Tensor with the local normal computed with the help of an auxiliary basis function.
The dummy term added in the formulation is then only used in the post-processing stage for the force computation.

The unknowns linked to this basis function un are indeed fully fixed and linked to a layer of elements touching the magnet.
We impose 1 at the boundary of the magnet and the rest of the values are  0, as the function varies linearly per element, the gradient gives the normal modulus the size of the element.

HTH,
Ruth


—
Prof. Ruth V. Sabariego
KU Leuven
Dept. Electrical Engineering ESAT/Electa, EnergyVille
http://www.esat.kuleuven.be/electa
http://www.energyville.be

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On 12 Apr 2017, at 08:52, Pablo Xavier Jara Palacios <pabloxjara at gmail.com<mailto:pabloxjara at gmail.com>> wrote:

Hi,
I was reviewing the .pro file in example of magnet which is posted in onelab's page, but I do not understand how the force is calculated in this problem. There is a dummy term in the formulation that I do not know what it is. Please help me with this doubt.

Regards,


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