Richard Postak It appears like your part is very thin and the geometry is not being fully captured. That’s what it means when you setup a simulation and can see through it
please try increasing the fidelity slider found above the play/pause button at the bottom of the screen. If it does not capture the model fully you may need a GPU with more memory or cuda cores.
Please take a look at this post Discovery Live: “Thin” geometric features and relative GPU adjustments