Consulting the dimension settings of FDTD simulation

- May 23, 2023 at 9:12 am
  
  ceshi xiazai
  Subscriber
  
  Dear all,
  I put a point DFT monitor to get the spectrum inside the pyramid cavity. I'm wondering why the intensity has a big difference between 2D and 3D FDTD region with everything else settings the same. Does the 2D FDTD region get a result by regarding the structure as a hexagonal prism rathan than a hexagonal pyramid ?
- May 23, 2023 at 10:02 am
  
  ceshi xiazai
  Subscriber
  
  For this case Whispering gallery modes of a microdisk – Ansys Optics
  2D FDTD region is conducted while the structure is a pillar. So does this structure be regarded as an infinitely long prism?(because there is no PML restriction in the z axis。
  - May 23, 2023 at 10:04 am
    
    ceshi xiazai
    Subscriber
    
    And I'm also wondering why a 2D FDTD simulation region was adopted in this case
- May 23, 2023 at 4:03 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Ceshi,
  
  You can use 2D simulation region if the structure has a translational symmetry along one of the axes. In your case since the structure is not uniform along the third axis, a 2D simulation region should not be used. If it was a hexagonal prism of infinite length then 2D FDTD would have been accurate. So, for 2D simulation you can assume that the structure is infinitely long and uniform.
  
  Regards,
  Amrita
  - May 24, 2023 at 1:12 am
    
    ceshi xiazai
    Subscriber
    
    Thanks for your nice reply! I have another question. For this case Whispering gallery modes of a microdisk – Ansys Optics
    the prism is not infinitely long(it seems to have a certain height),why can it use a 2D simulation region?

Viewing 2 reply threads

You must be logged in to reply to this topic.

Ansys Innovation Space

Boost Ansys Fluent Simulations with AWS

Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.

Earth Rescue – An Ansys Online Series

The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.

Ansys Blog

Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.

Trending discussions