[fluentnewb]

Hi everyone


I am attempting to model a single fin of a heat sink, surrounded by air, as a conjugate heat transfer problem. As it is only a single fin, my domain is much larger in the x and y directions than it is in the z.


My problem is that I cannot get a fine enough mesh size in the z-direction to capture the boundary layer without making my entire mesh tiny, which I cannot really afford to do.


I have tried using edge sizing with hard behavior, with multizone, tetrehedral and even hex-dominant methods, but the size doesn't permeate through the whole domain. If I use inflation, ANSYS I can't the overall thickness to what I need it to be.



Is there a setting I am missing or is this approach completely inappropriate? I can upload a picture of the domain if it will help.


Cheers!