# Star-CD and K-Epsilon turbulence model

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 June 1, 2009, 11:19 Star-CD and K-Epsilon turbulence model #1 Member   Hamoudi djamel Join Date: Apr 2009 Posts: 50 Rep Power: 10 Hello Everybody, I have a simulation on a numerical jet of air For this I use the Star-CD with Turbulence Model K-epsilon as you know at the beginning of the simulation we need to initialize the values of K and epsilon ( Energy and Dissipation rate of turbulence ) to calculate these two parameters Energy K = 3 / 2 * (U * I) Velocity of Jet . U = 286 m / s I= Intensity = 5 % K= 360,73 m2/s2 Epsilon Epsilon = (cmu 3 / 4) * K (3 / 2) / L cmu = 0,09, L= Mixing Length = 0.07 Epsilon = 1,25 e +04 My simulation diverge always Please I am waiting for your Answers ****** Is this possible ********

 June 2, 2009, 13:00 Hi #2 New Member   Join Date: May 2009 Posts: 3 Rep Power: 10 Hi, can I get your one which you are doing.. because I am working on k-e model. thanks gmg

 June 2, 2009, 13:02 Hi #3 New Member   Join Date: May 2009 Posts: 3 Rep Power: 10 my e-mail address is mustafa_ruet@yahoo.com. thanks.

 June 5, 2009, 06:02 #4 Member   Join Date: Mar 2009 Posts: 55 Rep Power: 10 Try using smaller URF for k and e to start the case and then later on increase as the solution has run for a few iterations and stabilised. You could also initiate the solution with smaller value of k. General k-e models under-predict the 'spread' of k values from meanline in jet modeling.

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