Star-CD and K-Epsilon turbulence model
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
K = 3 / 2 * (U * I)
Velocity of Jet . U = 286 m / s
I= Intensity = 5 %
K= 360,73 m2/s2
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 ********
can I get your one which you are doing.. because I am working on k-e model.
my e-mail address is firstname.lastname@example.org.
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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