Learning Forum

[Nino]

Hello guys,

 

I am trying to study the cooling of air that is flowing inside a steel pipe that sits in ambient air. I am examining the 2d-axisymmetric case.

 

I have modeled the 3 different domains (air-environment domain, steel pipe domain, air flowing domain) and have created a part of all three domains. 

I have a great structured mesh.

 

I have set the temperature of the air-environment at 273 K through the Fixed Values option in the Domains tab. The air is still and not moving so I have not defined any inlets/outlets.

I have set the steel pipe domain as a solid.

I have defined a velocity inlet (2 m/s and 330 K) and pressure outlet (0 pascals, 300 K backflow temperature) for the domain of the air flowing inside the pipe

 

I get a wall and shadow wall for the outer surface of the pipe, which is set as Coupled. I have the same for the inner surface of the pipe.

 

I am running the simulation and I am getting a result but when I get a temperature contour of a cross-section of the whole pipe, I get a specific temperature for the whole surface of the pipe instead of a linear temperature gradient that drops from the ambient temperature at the outter surface of the pipe to the temperature of the flow at the inner surface. I am supposed to get a regular conduction temperature profile inside the wall but instead I get a specific temperature throughout it's surface.

 

You can see the results here :

 

Does anybody know the issue here? Any help is greatly appreciated since this is for my bachelor thesis.

I get expected profiles for the flow and the ambient air since the temperature is decreasing and increasing respectively, but I am getting a weird contour for the pipe.

Nino

 

Does anybody know what's up with this? I am trying to get the temperature profile of the steel pipe without doing an FSI with Fluent and Static Thermal.

 

I even tested a regular wall with two air domains on each side, one hot and one cold, and I still don't get a conduction profile, just a specific value of the temperature (a specific color in the contour). I have created and meshed the solid geometry of the wall.

 

Thanks!

[Rob]

Duplicate  /forum/forums/topic/can-t-obtain-correct-temperature-contour-in-solids-in-fluent/  Please don't multi-post as it wastes time.