I suggest you follow https://skill-lync.freshdesk.com/support/solutions/articles/43000583840-introduction-to-meshing-and-inserting-a-method-in-ansys

thank you very much Muhammad Ali, it's so helpful

So important Shawon Bhattacharjee, thank you for your help.

In my case I try to simulate a heat transfer on the solar receiver tube, that possessed a tube with an exchanger inside. The length is 1.8m and the diameter is 0.06m.

It's so helpful Mr Shawon Bhattacharjee , thank you very much for your advices

Hi, If you show some pictures of the geometry, we can help you better.

Hi,

It depends on the studied geometry, I see that the hexa mesh with finer mesh near the wall is the best.

Thank you Mr. Ashkan Ghafari i will chare with you some pictues of the Geom