[omichalo121]

Hello, I'm trying to simulate a combustion in a combustion furnace. Whether i have a good temperature inside of it or not, the problem is that there is a weirdly high temperature ath the outer wall. The inner wall has the temperature of combustion chamber, then when the conduction comes in, the temperature inside of the wall goes to around 320 K just to change itself to around 600 K at the outer wall. Posting some images to get some visualization of it (temperature surface and the settings for outer walls)


The chamber also consists of 2 layers of different bricks - and the same problem appears and the connection of the bricks.

I have almost the same setting for the floor, the difference is the HTC at 5 and different material.


Do you have any idea what's wrong with it?

[AlexanderZ]

turn off "node values" option while making contours

[LuckyTran]

Looks like you are removing some sort of heat flux from between the two wall layers so that the heat is coming in from both sides, the outer wall and inner wall. Are you applying this convection boundary condition inside?

[omichalo121]

I didn't put any bc between these walls other that making there a shadow wall. But if that was the case, why would it happen on the side walls when there is only one type of wall?


Thank you all for the responses.

[LuckyTran]

I need to confirm the thermal condition of your wall and shadow wall pair are BOTH coupled? If either of them are not, then that is your problem. Because you are showing a pic of a convection BC condition, which I hope is being applied somewhere else. Can you draw a cartoon of each surface layer and type of BC being applied? Alternatively you can just post the 5 screenshots of each BC.

[omichalo121]

Hi, here is some BC of the walls and floor for you to check. Hope they're bad so we might find the problem.