Learning Forum

[Weiqiang Liu]

Hi all,

I am simulating a micro-channel methane combustion with solid wall. I drew both solid and fluid domain in ICEM. There is only one face between solid and fluid domain in ICEM model. 

After I imported the mesh into fluent, a catalytic wall shadow just appeared automatically. I am wondering what does shadow wall mean in fluent? What if I want to set constant temperature boundary condition in the interface, which boundary should I set? Wall or wall shadow?

Best.

weiqiang.

[DrAmine]

As you have a fluid solid boundary (CHT) AND even if the mesh is conformal Fluent would create a wall and its shadow which are per default thermally coupled. This allows for accurate flux calculations on each side of thus different physics domains.

[Weiqiang Liu]

Hi Amine,

if I want to set a constant temperature to the interface, which face should I set? interface or interface shadow? Because I read a paper in which the interface is set as constant temperature. 

I noticed that if one of the walls is coupled, then the other wall must be coupled thermal boundary. If one of the walls is constant temperature, then the other wall can be constant temperature or predefined heat flux.

Best.

Weiqiang.

[DrAmine]

I would recommend to decouple the walls. But if you want to set the temperature set it on the fluid side. Be aware if uncoupled the two sides behave as they insulated relative to one another.

[Weiqiang Liu]

but how can I figure out which one is fluid side and which one is solid side?

Best.

Weiqiang

[DrAmine]

Go to the boundary and check the zones adjacent to it. Or go the adjacency panel and you will find all 2d boundaries related to the cell zone.

[Weiqiang Liu]

thanks very much!

weiqiang