Learning Forum

[Rosmin_Elsa_Mohan]

Hello team, 
would like to check on the setting ' extend structure through PML' under boundary conditon tab for FDTD simulations. Does this mean the structure infinitely extends beyond PML ? 
Alternatively, how can we have PML boundary conditions/ other boundary conditions to study scattering for particles that are extending over a volume ? 

[Amrita Pati]

Hi Rosmin,

We have an article on 'extend structure through PML': Always extend structures through PML boundary conditions. Please have a look and let me know if you have any questions.

Alternatively, how can we have PML boundary conditions/ other boundary conditions to study scattering for particles that are extending over a volume ? 

Do the particles extend through the geometry in a certain direction only? Are these particles setup as a periodic arrangement? If it is a non-periodic structure, we mostly use PML BCs. Would be able to share a screenshot of the geometry? Maybe I can provide more detailed information. 

Regards,
Amrita

[Rosmin_Elsa_Mohan]

 

Hi Amrita,

I would like to refer to the Mie scattering example , Mie scattering (FDTD) – Ansys Optics , the boundary conditions are PML on all sides. Can we use PML if more spherical structures extend uniformly in all directions, that is more particles within the scattering/absorption analysis regions ?  As you mentioned if its non periodic structure , we can use PML – does this hold true here? 

If PML BC are used on x,y,z directions and if the ‘extend through PML’ is checked – can we assume the strucure(s) are extending through the PML boundaries? 
Appreciate the advice.