3D cfd mesh

hi 

 i am doing cfd tetra mesh in hyper mesh when i am converting 2D to 3D i found some error 

i) volume analyzer found 1 disjoint element( how can i find the disjoint element)

II) 8 bad elements need to cleanup, re mesh the origin mesh ( how can i rectify this problem and how to fine those bad elements )

what are  quality to maintained in cfd mesh  

note: no free edge, no connectivity  error , no duplicate elements

 

pls help me .........