Keyur Kanade
Ansys Employee

You can find general procedure for fluid volume extraction in following video.
https://www.youtube.com/watch?v=Jp8btI0PCyU 

One of the main reasons in failure is geometry errors. Please check geometry in SpaceClaim. Select geometry in structure tree --> Use right click --> Select Check Geometry. The geometry should be error free to proceed. If geometry has any errors, please modify/recreate geometry at those places.

Another reason is having some tangential contacts at some circular surfaces. Please make sure that bodies are intersecting instead of just touching each other.

Sometimes bodies are in contact only at some edges. At this point volume extraction may fail. In this case as well please make sure that bodies are intersecting each other.

During volume extraction some boolean operations are done in the background. If those boolean operations fail then volume extraction fails. In this case please check if you can use "Combine" command to "Merge" all solid volumes one by one. Please check if any volume is giving any problem.

If you have only handful bodies not part of fluid volume, please check if you can use "Combine" command to subtract required bodies from fluid volume.

Please check 

SpaceClaim Demo of The Week - Extracting Volumes for CFD, MFG or Design - YouTube

Also please check share topology option. 

Please check following videos

SpaceClaim Share topology:
https://www.youtube.com/watch?v=h43E1YO1LiM

 

Please go through help manual for more details 

Regards,

Keyur

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