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Calculation of force



Hello femm group.
I have a problem. I have simulation force effects between feromagnetic core and coil in the electromagnet. This simulation I define as axisimetric problem. The force is calculation by line integral (f = lineintegral(3)) along the contour for different position of feromagnetic core. When I made control estimation by post processor (without lua script) I was found different results. In my opinoin the results calculation by line integral are not right because theoretical assumption is other. I don't know where I make errors.
 
    Thanks
       Roman Beresik