Hi. I am a CFD beginner who will model turbulent flow using FLUENT from existing Star-CD model. Can I convert the Star-CD model directly and run the simulation in FLUENT package? Is there any functions or methods to do that? Or it is something not related completely between these two package? If you have any information or idea, please let me know. I appreciate your opinions. Thanks.

Look in manula for CGNS

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Thanks for your opinion. I found that Star-CD can write cgns file and FLUENT can read cgns file.

Is there any built-in export and import functions which I can use in Star-CD and FLUENT or I have to code the cgns file by myself?

Try to have a look in manual or go through some menus within any of these codes. like for Fluent menu: file/export or file/import it is a bit more complicated within STAR-CD but if you type command: convert followed with help you will see all commands you need (to get help for particular command type 'help command')

or go to tools/convert/foreign (or something like this) or using STAR-guide folder: export or impoert grid(results)

Hope it helps.