hello. I have an oven with some entries of warm air (313 k) and a steel chain inside of the oven. I want to simulate the heating of the chain,the heat transfer from the fluid into the solid. So in Gambit i have modelled a fluid zone (air) and a solid zone (chain). Fluent forum administrator told me to use coupled boundary condition,but i don't know exactly how to activate it because fluent manual is not clear about this. In wall boundary condition panel for the surface of chain i don't have coupled thermal condition option but only heat flux,temperature,convection,etc.

This is my boundary condition panel

Zone Type default interior - interior default interior:001 - interior fluid - fluid solid - solid inlet - velocity inlet outlet - presssure outlet chain surface - wall oven's walls - wall

What should i do? Thanks a lot for the help

well this is how a heat transfer boundary condition is defined, either by specifying the temperature or the heat flux, right and do not forget to activate the energy equation

Have a look at the tutorial no. 2: "Modeling Periodic Flow and Heat Transfer"

Hello. Thanks for the reply. i have found how to activate coupled boundary condition, splitting fluid and solid volume in Gambit. Fluent automatically generate two-sided wall: 1) wall (adjacent cell zone: fluid) 2) wall-shadow (adjacent cell zone:solid)

Should i activate coupled option for both wall and wall-shadow, for each side of the two-sided wall? Another question is: Can i use standard wall function or should i use enhanced wall function to include thermal effects? Is it rilevant in the chain heating? Thanks a lot Emanuele

[thermal energy]

hello emanuele,

ı have a question that you before. ı need help. thank you. good work.

Should i activate coupled option for both wall and wall-shadow, for each side of the two-sided wall?

[zhouxman]

Originally Posted by thermal energy

hello emanuele,

ı have a question that you before. ı need help. thank you. good work.

Should i activate coupled option for both wall and wall-shadow, for each side of the two-sided wall?

each side of the two-sided wall

[thermal energy]

Originally Posted by zhouxman

each side of the two-sided wall

Hi zhouxman. you need to activate each side of walls (wall and wall-shadow) as coupled.

[zhouxman]

Originally Posted by thermal energy

Hi zhouxman. you need to activate each side of walls (wall and wall-shadow) as coupled.

Thanks thermal energy, I got it

[RodriguezFatz]

Hi guys,
If "coupled" is selected, why is there a "Material Name" to select in the "Thermal" tab? What is it used for?

[LuckyTran]

Originally Posted by RodriguezFatz

Hi guys,
If "coupled" is selected, why is there a "Material Name" to select in the "Thermal" tab? What is it used for?

It's for simulating thermal resistances and it is used together with the Wall Thickness property. It uses a 1D heat conduction model to model the temperature drop.

[RodriguezFatz]

Ok great, thanks for the answer! So for a regular coupled boundary without any extra artificial wall thinckness, is doesn't matter what material I choose here, right?

[LuckyTran]

Originally Posted by RodriguezFatz

Ok great, thanks for the answer! So for a regular coupled boundary without any extra artificial wall thinckness, is doesn't matter what material I choose here, right?

Correct, if you set the wall thickness to 0, then it doesn't matter what material is there.

[saeed144]

hello
I have a problem with pointwise.
I created two sets of blocks connected with a line which I am trying to use it as a thin wall. one block is solid and the other one is fluid. I can not export the mesh in a way that the coupled option <<in thermal tab in fluent wall condition>> be accessible.
can any one help me?