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Dear Pablo Xavier,
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<div class="">The force is calculated by means of the Maxwell Stress Tensor with the local normal computed with the help of an auxiliary basis function. </div>
<div class="">The dummy term added in the formulation is then only used in the post-processing stage for the force computation.</div>
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<div class="">The unknowns linked to this basis function un are indeed fully fixed and linked to a layer of elements touching the magnet. </div>
<div class="">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. </div>
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<div class="">HTH,</div>
<div class="">Ruth</div>
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—<br class="">
Prof. Ruth V. Sabariego<br class="">
KU Leuven <br class="">
Dept. Electrical Engineering ESAT/Electa, EnergyVille<br class="">
<a href="http://www.esat.kuleuven.be/electa" class="">http://www.esat.kuleuven.be/electa</a></div>
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<a href="http://www.energyville.be" class="">http://www.energyville.be</a></div>
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Free software: <a href="http://gmsh.info" class="">http://gmsh.info</a> | <a href="http://getdp.info" class="">http://getdp.info</a> | <a href="http://onelab.info" class="">http://onelab.info</a><br class="">
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<blockquote type="cite" class="">
<div class="">On 12 Apr 2017, at 08:52, Pablo Xavier Jara Palacios <<a href="mailto:pabloxjara@gmail.com" class="">pabloxjara@gmail.com</a>> wrote:</div>
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<div class="">Hi,</div>
<div class="">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.</div>
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<div class="">Regards,</div>
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