# Turbulence modelling in CFD

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 September 2, 2002, 21:13 Turbulence modelling in CFD #1 Fabian Guest   Posts: n/a I am a final year undergraduate student at university, and am doing my thesis on the numerical modelling of a 2-Stroke Engine using CFD-ACE. 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

 September 6, 2002, 08:52 Re: Turbulence modelling in CFD #2 vinod Guest   Posts: n/a 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.

 September 10, 2002, 10:12 Re: Turbulence modelling in CFD #3 Tim Guest   Posts: n/a 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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