Zero Gradient for in/outlet turbulence condition?
 

Hi guys... I've a quick question about the definition of zero gradient for turbulence when I specify the inlet or outlet boundary condition in CFX. This is the latest add-in to the treatment of boundary condition. I find little information about this from textbook.

Can anyone please help me to understand this term?

1)Is it defined as 0%Turbulence Intensity?

2)Any significant advantage if compared to specifying a constant % of turbulence intensity at inlet/outlet boundary?

Thank you very much.