capacitance of parallel plate capacitors

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Hi, I'm new to Comsol. I want to calculate the capacitance of parallel plate capacitors. Here are the steps.

  • set two blocks with distance.
  • set a sphere to surround the blocks.
  • use Difference to subtract blocks from the sphere.
  • set the blocks to be silicon and sphere to be air.
  • set one block to be terminal 1 with 1V, another is ground.
  • use Stationary Study to compute. so far, everything is fine. But when i try to sweep the distance between two plates, the capacitance does'nt change. Can somebody help me to find the problem?

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