How to make a compressible bellow in Rhino5/Grasshopper?

Hi there, I'm trying to make a (rubber if that's easier, but more specifically mylar-either one is fine) bellow that compresses when I later run the cad through a CFD software. I am fairly new to Rhino and to be honest, I'm really lost. I would really, really appreciate any guidance anyone can offer or a point in the right direction. Even if you just have experience with not exactly this, but something similar. Thanks!

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