Hi, I have a problem plotting the Yplus value. I know that it can be seen only on walls. While I am setting up the problem, I didn't select all the surfaces as a wall. It's just a simple duct flow. I used k-e turbulence model. Is there anything I should select during Pre? Thanks...

Default region =wall(in Post). CFX-Pre automaticaly moves 2d regions without any BC assigments to default region and treat them as walls. So you usualy will have one default region per domain.

I do not have any region. There is no "default region" in the object selector in Post. The only default thing is default domain and legend. Even if I cut the volume with any type of plane and plot the yplus values, I saw 0 all over the wall. I also can not get any result for wall shear stress. It is also all zero.

I found it. I was using interfaces between different solids to make the mesh sizes different. So I didn't defined any wall surfaces. If you do not define any wall surfaces then CFX does not compute Yplus values for default walls.