about thermal conditions for two-sided walls

Devy

Hi,Fluent Users:

I am simulating combustion of gas,and the flame temperature is about 3500k. I also define a wall zone which have a fluid or solid region on each side.And I want to couple the two sides of the wall,so I select the coupled options under thermal condition.

When I get convegenced solution and I plot surface heat flux on the two-sided walls,I find the result is nearly zero.

Would you give me some advice?Any ansnwer wiil be welcome.

Thank you.

Devy