sub-invigorated model: heat exchanger

[painaz]

I have a pipe of a heat exchanger.

the solid model is a unique body, the fem model provides flat deformation.
I use symmetry, model only 1/4 section.

in reality the tube is made of a core of magnesium alloy and aluminum alloy extinguishing.
then the fem model uses the "surface region" to simulate the inner tube and that external alettato.

I have a thermal load and a pressure.

it seems ok, but the analysis fails because it seems (but not to me unfortunately) subvinculated:

I attach the model and materials, hoping for a straight
View attachment tmp.rar

 

[Matteo]

hello, ok the "volume" region (not "surface" in this case).
for constraints, I would ask you a detailed image in which constraints and bound surfaces can be seen.

 

[painaz]

hello, ok the "volume" region (not "surface" in this case).
for constraints, I would ask you a detailed image in which constraints and bound surfaces can be seen.

Now I don't remember exactly the details: I had never used mechanics for thermal loads and a few months ago I had done an exercise of a book on prom to clarify my ideas. in any case there is the attached model (tmp.rar). As soon as I have time I take it back in my hand and I clearly tell her what fails and what my doubts are.

Anyway thank you: we hope that this section of the forum will be renewed.