Determining inductance per meter with 2D analyses

["gopherlid" <macy@xxxxxxxxxxxxxx>]

Anybody have an idea how to calculate inductance per length?

I tried using the formula 1/2 L I^2 = Energy

but the Energy value changed too much based upon number of nodes. 
We're talking 100% It's as though, more nodes, more energy with no 
asymptotic limit in sight!

It's a very simple structure, a wire with a slab of metal around it, 
so the results should be straight forward. However, the "magnetic 
field energy" seems to relate to the number of nodes *and* the number 
of nodes in the metal, which makes no sense, since there is less than 
0.01% energy in the metal. But changing the nodes in the metal 
actually made the inductance change by a factor of 2:1 

Any ideas? Plus ideas on how to know when enough is enough?

- Robert -