Removing Small Parts

I know Solidworks has a feature called "Defeature" which allows you to strip away important detail or small parts. It does exactly what I want it to do but the only problem is the final result is one geometric volume. I still need multiple volumes because I need to export this figure to do CFD analysis. Does anyone know a way to remove small parts in Solidworks but the final result is not one solid part? Thanks!

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Defeaturing is generally used by engineers performing CAE Analysis, You can see some procedure here in a CAE Software called midas NFX:
http://feaforall.com/2013/04/21/cad-model-simplification-for-fea-analysis/

 
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