mesh error in the array

niharika_kaja · June 30

I am facing issue with simulating the array as the triangular mesh seems to have a common surface. What can be done to resolve it?

Torben Voigt · July 1

Hi Niharika,

I am also surprised by the error message, and unfortunately I could not find the cause. However, a simple workaround is not to use the Finite Array tool and simply copy the unitcell instead. That's how it works. I have attached the model. Note that I have simplified it slightly. It is sufficient to define very thin PEC regions as faces.

Best regards,
Torben

niharika_kaja · July 2

Torben Voigt_20420 said:
Hi Niharika,

I am also surprised by the error message, and unfortunately I could not find the cause. However, a simple workaround is not to use the Finite Array tool and simply copy the unitcell instead. That's how it works. I have attached the model. Note that I have simplified it slightly. It is sufficient to define very thin PEC regions as faces.

Best regards,
Torben

I cannot view this file as I use Feko 2022. Upon viewing on a different system, I have noticed that the file needs large memory to run. Can you list the changes you made for me to implement on my own since I cannot fully figure out through this file?

Torben Voigt · July 3

Hi Niharika,

The version I used is Feko 2022.3.2 legacy. This is the last update of Feko 2022. If you cannot open it, it is probably because you are using Feko 2022.1 or something similar. Please start the updater to update to Feko 2022.3.2.:

You are using the "Finite Array Tool" in your model. This makes it easy to create an array from a given unit cell. Normally, the Domain Green's Function Method is then used for solving. In principle, this means that only a single unit cell is solved and then the interaction between all other elements of the array is determined using Green's Functions. This is a very fast alternative to the classic full wave simulation.

This was deactivated in your model, which means that the entire array is solved with MoM (or MLFMM). Memory requirements and runtime are then of course significantly higher than with DGFM. Note, for arrays where there is no distance between the individual elements (as here), DGFM cannot be used anyway.

I have now removed the finite array and then created the elements manually using Copy & Translate. Then I added the waveguide ports and sources manually as well.

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