Can anyone plz tell me as to where i can get 3d CAD models of the different hull types to do flow analysis and to test our own solver created using UDF in FLUENT?

Try this one:

http://www.dt.navy.mil/hyd/sur-shi-mod/index.html

It's a stardard hull form used a lot for validation and verification.

There's also the CFD Workshop from Stockholm and Tokyo where they used a model from a tanker to study various conditions but can't find the link. Watch this space!

Hope it helps,

James M

found it!

http://www.nmri.go.jp/cfd/cfdws05/

Have fun, and let us know how you get along.

There is a freeware programme called Free-ship will has a number of various hull forms which you can export.