boundary layer, very urgent

nicolas

Hi. I am a beginner in CFD. I use ICEM CFD 10.0+ cfx 5.7.1

I have a cylinder+ some others parts of a engine. I used blocking + hexa mesh for everything under ICEM. I used O grid generation, and I created a small volume around the wall, to set a fine mesh here. Someone told me that , with hexa mesh, I did'nt have to care about the boundary layer(but i need to have a fine meshin this volume). What i understood, is that I don't care about the position of the first node, and the law mesh in this volume.

Is it right? wrong? I found no explanation on websites, documentations, on "how to" do a boundary layer when using hexa mesh (i found it for prism, tet)... Do I need to set exponential law in the small volume around the wall(and how to do it?)

Does someone can help me to understand how to treat the boundary layer under icem, using hexa mesh (and o grid generation).

If it is explained on doumentation, can you give me the references ?

Regards, Nicolas.