modeling
 

hi friends. I want to modeling 3D pipe with constant temperature at outer surface, and fluid flow at inner of tube. i sketched it in DM (Ansys).so i have 2 bodies 1 pipe and 2 is fluid flow.when i mesh it and export to fluent, in boundary condition i have extra surface.how i can coupled between fluid surface and pipe?
thanks

can you share some pictures ? the project ?

I have 2 geometry 1 pipe and 2 fluid that flow in tube.i sketched it in DM. i use from Ansys Mesh. in ansys mesh i define 3 face as inlet outlet and body of tube.but when export to fluent i see this situation as boundary condition

body of tube
outlet
inlet
fluid
solid
interior-fluid
interior-solid
wall-fluid
wall-solid

everything which is 3d is considered as interior-fluid...