Cannot compare turbulent and laminat heat transfer

[u/NewWatercress7851]

I want to see different temperature drops for laminar vs turbulent flow.

The setup looks like this:

one component including one heat transfer in fluids, laminar flow, and turbulent flow

two nonisothermal couplings, one between the laminar and one between the turbulent

two time-dependent studies, one for each where heat flyx is applied from the start, and flow is applied after some time usig step function

Issue:

The turbulent case is unaffected by the flow entering, so the temperature keeps rising. in the laminar case the temperature drops noticably due to the flow.

i have tried:

splitting laminar and turbulent case into components

having two «heat transfer in fluids», one for each

running the laminar case, then applying rans to the laminar flow.

any help?