• djihad-amina.djemmah


      I have a question about the boundary conditions.
      I am simulating a 3D structure composed of 2 cubic resonators, the first one is big and the second one is small as shown in the figure.

      My structure is periodic along the y-axis.
      If I use PBC, will there be a mirror effect i.e. my structure reverts to a big resonator, a small resonator followed by a small resonator, and a big resonator instead of big then small?


      Waiting for your reply.

      Thank you in advance

    • Guilin Sun
      Ansys Employee

      This might be related to the fundamental of the periodic boundary conditions. Mathmatically, f(y+d)=f(y). this means the unit cell repeats its self, by shifting a period from each other.  In your case ,suppose currently this is the center unit. for the +1 unit, it begins from the larger and then the smaller, the whole device will be "large, small;large, small;..."

      It is just a shift, not a refection.

      You can group them, then use "array" to create 3 units so you can see what it looks like:

      if you have questions on how to use the "array" function and what do those parameters mean, please write a new post.

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