I tried to first clean up the stl file using the tools like auto fix, smooth, and repairing tools like stiching, missing faces, gaps etc. Many of the errors could be solved but many weren't stating 'tas9k could not be completed'. Somehow I managed to convert it into surface patch body and then upon few simplifications to a solid body, however, the solid body appears to have very irregular faces, where I also tried to merge a few faces and apply few cleaning tools and then tried to mesh it in fluent, but the surface mesh doesn't progress beyond 65% and continues in operation without progress for hours. I tried to mesh it in workbench also, but here also, the meshing doesn't progress for hours. I am attaching here the screenshots for the converted solid body and another cleaned up facets which somehow doesn't convert into solid and doesn't even show any missing gaps or faces to fix.
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