Turbulence modelling in CFD
I am a final year undergraduate student at university, and am doing my thesis on the numerical modelling of a 2Stroke Engine using CFDACE.
I have sucessfully modelled 3D laminar flow, and now am looking to model turbulent flow. The problem is that i don't have any values for K and D (epsilon), to input into the simulation. I am seeking help from anyone who has even approximate values for K and D that i can use as a starting point for the turbulent modelling of this simulation. Any help that could be offered would be greatly appreciated. Cheers 
Re: Turbulence modelling in CFD
as far as i know the general practice to take K is 0.5* times the free stream kinetic energy. i.e 0.5* uinfty**2 but for D(epsilon) it can give some high value, say 30000 or so.

Re: Turbulence modelling in CFD
For K & E value at inlet I use:
K = 1.5 * (I*Uin)^2 E = (k^1.5)/characteristic length I is some turbulence intensity (varies from case to case)  try 0.05 for a start Tim 
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