[sara22]

Hello guys
I new at Ansys meshing. i model one shell and tube heat exchanger in design modeler for simulate in fluent.
for attach more quality mesh i have to slice fluid body to three section (three body).
so i have question that i must define particular boundary condition between this sections(three body are )?

[sa_m]

hello
no .you must not.
in design modeler and in ((tree out line)) , right click on all three bodies and select ((form new part))
by this way, you can mesh each part with an optional setting and boundaries are perfect matched.
regards

[sa_m]

also you can see this
http://www.cfd-online.com/Forums/ans...h-failure.html

[sara22]

tanks about your ans. if when i separate fluid body(three body-as new part) fluent detect boundary between solid and fluid domain as a shadow?(coupled wall between solid and fluid domain)