Presently I have a cylindrical volume aligned with the z axis in a 3D model.
I am trying to do the same calculation Kevin mentions, an integration of the magnetic flux density through a surface. Or is it necessary for me to only enter the radial component of the magnetic flux density as my expression under Boundary Integration? When I enter sqrt(Bx_emqa^2 + By_emqa^2) as my expression under Boundary Integration, does COMSOL 'know' to only integrate the radial component of the total flux density (since the azimuthal component contributes nothing to the flux given my surface)? Expressed in terms of cylindrical coordinates, some of this magnetic flux is directed in the radial direction and some is directed in the azimuthal direction. The question I am asking then is when calculating the flux, does COMSOL 'know' that only the radial component of the magnetic flux density contributes to the flux (given the surface I am integrating over)?įor instance sqrt(Bx_emqa^2 + By_emqa^2) gives me the magnitude of the magnetic flux density. (The azimuthal component of the magnetic flux density does not contribute anything.) Therefore only the radial component of the magnetic flux density contributes to the flux. In this case, with the curved surface I'm integrating over, the surface normal points only in the radial direction. The flux through a surface is computed by taking the dot product of the magnetic flux density vector and differential surface vector (and then integrating over the surface).
It makes sense to me that the COMSOL answer I get will be in terms of Wb/m and I will have to multiply by the height of the object to get the flux in Wb.
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