i used Gambit(using grid line,coordinate) to create my model, and i has export it to Fluent. my problem is related to dimension setting. when the meshing exported into fluent, fluent interprete 1 unit of coordinate as 1 cm, however i want my model to be 1 unit as 1 mm. what should i do? i know this sound stupid, but i really need help.

Use scaling after importing the data into Fluent. You can model in mm and convert that into m. You have to be careful about the units of other variables! If you are consistent in any unit then results would be consistent. Ashutosh

thank you for your advice.