Maxwell Equations Absorbent Boundary Conditions

AI Thread Summary
Absorptive boundary conditions in electromagnetic field simulations are designed to simulate open boundaries and minimize reflections within a computational domain. The key to their effectiveness lies in matching the impedance at the boundary, which prevents reflections when properly implemented. The discussion highlights the need for clarity on how specific conditions, like 1.2c), facilitate this process. Participants are encouraged to share insights and references to deepen understanding of these concepts. Overall, the focus is on the practical implementation and physical interpretation of these boundary conditions.
gltau99
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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):

1725869183308.png


with

1725869214080.png

(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!
 
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Baluncore said:
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 ?
 
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gltau99 said:
and how does condition 1.2c) enforce that ?
Can you add a link to your reference please? Thanks.
 
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