[diamondx]

hello everyone,
Until now, i never tried an unstructured mesh, i got my feet wet today and it's giving me hard time !!! i'm trying to understand the logic behind it. I will try to explain my problem using a very simple geomtry as below, it's a heat exchanger.



So I created two materials, Hot_fluid and cold_fluid. After doing the training material and reading a lot in the forum. i found that there is a lot of method to mesh this some start by creating a surface mesh, then they use a quick (delauney) to fill the volume mesh ? is it the best way possible ? Why not generating a volume mesh directly ?

How to deal with the heat exchanger below ? i tried a volume mesh, checked hot_fluid as visible, then i succeeded in creating element inside the hot fluid ONLY. But how do i mesh the cold fluid now ? when i hide everything and i keep only the cold_fluid, it doesn't work. when i try the "by part" option and i only select "COLD_FLUID", it's telling "no parts containing surface found"



So my question:
- Using surface mesh, then volume mesh i noticed that i could only use it with delaunay otherwise i have to replace or merge, am i right ?
- that what we call the flood fill option ? is it a trick to get a better quality like adding an (o-grid) ?
- Can we mesh the Hot_fluid and Cold_fluid separatly ? if yes , do we have to merge then ?
- if i do i surface mesh on hot_fluid, then a volume mesh for the hot fluid, the volume mesh for the cold_fluid had to be conformal (sharing same element) with the surface of the hot fluid ? will this be automatically ?
- if i set a very refine and small size elements for a surface , and i take a curve belonging to that surface, set the parameter to coarse element, Which one ICEM will follow ?

I know it's too much question ! sorry about that. Thanks a lot in advance.