Maxwell Equations Absorbent Boundary Conditions

[gltau99]

TL;DR Summary

Looking for explanations on how absorptive boundary conditions in Maxwell's equations simulate open boundaries in electromagnetic simulations, preventing artificial reflections.

Hi everyone,

I'm trying to understand the purpose and functionality of absorptive boundary conditions used in simulations of electromagnetic fields. Specifically, how do this conditions 1.2c):

with

(and ν the unit outward normal on the boundary Γ; Pτ , the projection of the trace operator)

simulate an open boundary and prevent reflections within a bounded computational domain? Any insights into their physical interpretation or practical implementation would be very helpful.


References:
https://www.semanticscholar.org/pap...ntos/64177e2129da814049dba96c0478821aa8bb8224

https://epubs.siam.org/doi/pdf/10.1137/S0036139995289234
Thank you!

 

[Baluncore]

Welcome to PF.

If the impedance is matched, there will be no reflection.
Space cloth. https://en.wikipedia.org/wiki/Space_cloth

 

[gltau99]

Welcome to PF.

If the impedance is matched, there will be no reflection.
Space cloth. https://en.wikipedia.org/wiki/Space_cloth

Thank you for the answer. But how does condition 1.2c) enforce that ?

 

[berkeman]

and how does condition 1.2c) enforce that ?

Can you add a link to your reference please? Thanks.

 

[gltau99]

Can you add a link to your reference please? Thanks.

Of course,
https://www.semanticscholar.org/pap...ntos/64177e2129da814049dba96c0478821aa8bb8224

https://epubs.siam.org/doi/pdf/10.1137/S0036139995289234

Thanks in advance