traction free bc
Hi everyone
Does anybody know haw can I introduce "traction free" BC at the outlet of my domain in CFX? Regards 
What is a traction free BC?

this relation is called "traction"
T=pI+2*mu*D,D=0.5*[grad(u)+grad(u)^T] whenever it equals to zero, there is no traction or we can say it is traction free 
by the way "mu" is viscosity of the fluid

I assume u is the velocity field. What is p and I?
Can you explain what is the physical significance of this? 
P is pressure and I is the Identical matrix. it is said that this kind of bc does not affect the upstream flow conditions significantly

I see.
You may be able to do it as a CEL function on an outlet boundary condition with a CEL specified velocity or pressure, but you probably have to implement it in fortran. 
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