Heat transfer in a channel: solving for T; questions about Pe and solving
I'm doing CFD for a wavy channel, using simpleFoam and the k-omega-SST model to solve the velocity field. I'd now like to solve for T, and did some intermediate processing (post-U, pre-T):
For my first attempt at solving T (scalarTransportFoam) I used
My main question now is: what can I do to get a usable temperature field? While Pe > 2 does not necessarily mean that the solution will be wrong, I could increase alpha and nu (in order to maintain Pr = 7), but that would mean that I have to increase U or the domain size as well to adjust Re. Wouldn't that just lead to the same problem, but on a different scale?
Another possibility is of course that my code for Pe is just plain wrong. Maybe someone could comment on this; OF's Pe tool just calculates Pe at the boundary, using a different equation.
I can not refine the mesh by a factor of 150, as I already have about 2 million cells.
Try to use "limitedLinear 1" for convective fluxes. It will use linear and switch to upwind in areas with big variable value gradients.
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