kEspsilon Refine Mesh
 

Hello all,

I am running a chtMultiregionFoam case of an annular flow channel, incompressible flow running at 0,14 m/s, P=70bar and sudden temperature change at inflow from 60 to 276ºC

I use the high-Re kEpsilon model with kRWallFunctions for the boundary at the wall-cylinder

The problem is that whenever I refine the mesh the solution changes a bit and I don't know how to say which one is correct
Anyone has any idea about how to compute which one is the correct y+ value? I've read that it should be around 30 and 200 but I would like to have a more precise range

And also... What is it supposed to be inside the first cell near the wall? The laminar sub-layer or the does it have to go till the logaritmic profile?

Thanks a lot in advance =)