When I studied the calculation of curvature in the Microfluidics Module User' Guide, I found that the software used different methods when using level-set model and moving-mesh model. The former uses the divergence of interfacial normal vector (i.e., 
), while the latter uses the tangential divergence (i.e., 
, and 
). Why is that? Is it wrong?
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Calculation of the Curvature (Did the help file go wrong?)
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