Hi all:

Here is my situation:

I would like to make a LED heat sink simulation by connecting a LED and a heat sink.

My steps are as below:

1. Creating a general analysis connection between LED and heat sink.

2. Creating a thermal connection behavior.

3. Creating a contact pair, using above.

4. Setting initial temperature as 25 Cdeg on both body.

5. Creating a Film condition by select all heat sink surface.

6. Creating temperature boundary condition(80 Cdeg)  by selecting LED body.

Start the calculation and attach the result.

Here is the result image of heat flux

But the result image of nodal temperature is as below:

My question is why the result image of nodal temperature look as above, look like there is no heat transfer?

Here is my file. Hope you could support me to fix this issue.

Thanks a lot!