Hello all,

I am working on a thermal model in Ansys Fluent 2019 R3, with the geometries of 4 cylinders of different lengths. Three cylinders form an inner tube and one cylinder as an outer tube.

All are considered as a single part.

It is a multiphase model with one material in the inner tubes and another material in the outer tube. I have chosen inner tubes as one cell zone and outer tube as another cell zone. When I gave inlets with a certain velocity and the heat boundary condition on one wall of the inner tubes (mostly first or second tube). I cannot see any heat flow. Moreover, I see a phase distribution issue even after mentioning different cell zones.

Could anyone suggest to me or help me, what could be the reasons for these issues? I have revised many videos and multiple papers regarding the problem. But, I see no useful information.

Any sought of help is highly appreciated.

Thank you

Rajesh