multi-body meshing with ICEM CFD
 

Hello,

I'm going to mesh a multi-body geometry which consist of one fluid domain and 3 solid domains. The problem is conjugate heat transfer in all domains where fluid is circulating through the tube. Unfortunately the geometry are very narrow and complicated(the fluid domain range is 2cm*2cm*18m and the last exterior solid domain range is 1m*1m*18m) and Ansys meshing module cannot do it. So I decided to mesh it with ICEM CFD. The geometry was constructed in Solidworks as assembly part and imported in ICEM CFD. My question is how can define 4 interior domains and 3 interfaces in ICEM CFD so that the exported mesh to fluent recognize them. I know one method is, splitting the original block and renaming the associated blocks to each domain but this is very tedious method for this geometry, because the geometry consist of U-tube shape inside it and cannot mesh it only with 4 simple split blocks. Now my question is how can I mesh this geometry? Is there a way to mesh each domain separately and adjoin the mesh together? If the answer is yes, how can define the 4 interiors and 3 interfaces as mentioned above?
Thank you so much.