Wall Treatment

* wall treatment

You can combine the turbulent flow interfaces with different types of wall treatments, according to the following list:

1. Wall functions
     + Robust and applicable for *coarse* meshes
     + Limited accuracy
     + Smooth and rough walls
     + Supported by k-ε, Realizable k-ε, and k-ω
 2. Low-Reynolds-number treatment
    + Resolves the flow all the way down to the walls
    + Accurate
    + Supported by all turbulence models except the standard k-ε and Realizable k-ε
 4. Automatic wall treatment
      + Switches between low-Re treatment and wall functions
      + Accurate according to local mesh resolution
      + Inherits the robustness provided by wall functions
      + Default for all turbulence models except standard k-ε and Realizable k-ε