[robboflea]

hi all,

I noticed a thing in fluent which I don't understand and I'll be happy if somebody could explain it to me.

I was working on a CFD simulation for a turbine vane with transitional SST turb model and I was setting the inlet turbulence boundary conditions in the form of turbulence intensity and length scale.

My idea was that these values were used in fluent and converted to the corresponding values of k and w which were actually imposed as boundary conditions at the inlet.
However, after my CFD has converged I found out, by plotting the contours of k and w at the inlet that their value is not even close to the value they should have from the turbulence intensity and length scale.

If I specify directly k and w as boundary conditions then they are kept constant at the inlet.

So my question is: how are the turbulence intensity and length scale information at the inlet handled in fluent? Why do they give way to different values of k and w?

I hope I've been clear enough.
Thanks for your answer.

Cheers,

Rob