you will first need to clean the geometry in SpaceClaim. For that try and convert the facets to 3D before importing to workbench. Also, I would suggest extracting the fluid volume in SpaceClaim itself instead of first using SpaceClaim for solid and then taking it to Designmodeler to avoid any transfer losses.
check out videos similar to this:
https://www.youtube.com/watch?v=aJIDzC9F5E0
-Aniket
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