initialising a thermal boundary layer
 

I want to initialise a thermal boundary layer with a temperature profile but I do not know how.
I have been looking at the Prescribing Constant Temperature in Fluid Cells but it is not clear to me. I have tried it for a fluid only domain. To use Prescribing Constant Temperature in Fluid Cells I need to have a volumetric heat source, which I do not have.
Is there any other way to initialise the thermal boundary layer?

If you want to do this as a field and your flow is turbulent it would be very easy to assign a field function with the layer profile using the wall distance field function as the position in your profile.

thanks for your reply

I am using a laminar flow model with no velocity inlet, just two pressure outlets.

can you explain a bit more on how to implement it.

You would have to turn on a turbulence model first. Then create a field function with your desired boundary layer profile, using the wall distance field function as the independent variable. Initialize the simulation, then switch the physics from turbulent to laminar, and then run.

I haven't tried doing that before, so it might break, but you'll have to see.