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nonstandard boundary conditions

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I have a 2D vector field (2D in X and y) that I need to apply nonstandard boundary conditions. Does anyone know how to apply a boundary condition for the jump in the tangential component of a vector field across two regions?

For example
an x [F1-F2]=az C
where an in the normal unit vector, F1 and F2 are the vector fields in region 1 and region 2, az is the unit vector in along the z-axis, and C is a constant.

I can cast the problem as a scalar field is which the BC would be:

f1_l - f2_l = C

where f1_l and f2_l is the derivative of the scalar field (f1 and f2) along the boundary.

The vector problem is defined in the attached file.

Thanks for any input.


1 Reply Last Post 18.04.2012, 09:00 GMT-4

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Posted: 1 decade ago 18.04.2012, 09:00 GMT-4
Hi,

I think this could be done by adding a constraint in Equation System - Boundary Settings. You also need to define vector fields on both sides of the boundary.

BTW, it seems the function of assembly in COMSOL is supposed to treat this kind of problem. However I'm not familiar with that. Looking forward to other people's replies.
Hi, I think this could be done by adding a constraint in Equation System - Boundary Settings. You also need to define vector fields on both sides of the boundary. BTW, it seems the function of assembly in COMSOL is supposed to treat this kind of problem. However I'm not familiar with that. Looking forward to other people's replies.

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