That's just how periodic conditions are set in fluent (2019R2), one needs either mass flow rate or pressure gradient as input, and then inlet temperature of fluid , only then periodic bc is fully defined. (Wall temperature is defined in wall bc)
Yes, I am using a aspect ration boundary layer generation, which already yields a y+ of roughy 0.4 or 0.5 to me.
Also, would you have any other suggestion for me, regarding the reference temperature that I set for various of my cases in the table above?
Could use some help related to it.