Transitional Turbulence

Andres Bernal Ortiz

Hi, i'm testing the Transitional Turbulence Model in CFX 5.7.1...it's a very tricky model to make it coverge..Mr. Horrocks and all the other Gurus can tell me some advices to make these model work?

Re 600e3; Airfoil NACA4415 and NACA4418 AoA from -4 to 12 degrees High Resolution, Physical Timescale, MAX 1e-4

I change the High Resolution for Specified Blend factor of 0.75, 0.8 and 0.9...the solver shows an image like an electrocardiogrm.

After that, I change the Physical Timescale for Agressive, Conservative and Local TimeScale factor of 3,4 y 6...nothing happens...

I have a mesh with expantion ratios < 1.02 and y+ < 1.

Please help me, i been trying for 5 days and my solution don't converge.

Thanks in advance,

Andres - Colombia.