# How to set up BCs for k epsilon model

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 February 5, 2014, 09:33 #41 Member   Mehdi GHOZALI Join Date: May 2013 Location: Dubai, UAE Posts: 65 Rep Power: 6 Yes I did type uniform in the input file. for the free surface I kind figure it out. I'm gonna try and find something about the kOmega model, do you have any link that I can start with ? Thank you for your help

 February 5, 2014, 09:54 #42 Senior Member   Mihai Pruna Join Date: Apr 2010 Location: Boston Posts: 192 Blog Entries: 1 Rep Power: 9 Here's some issues people have helped me with for internal flow: http://www.cfd-online.com/Forums/ope...ty-driven.html __________________ Mihai Pruna's Bio

October 19, 2015, 16:25
value
#43
New Member

Fei
Join Date: Oct 2015
Posts: 13
Rep Power: 4
Quote:
 Originally Posted by nileshjrane Put this in "/0/k" file for inlet. 0.05 corresponds to 5%. The value is actual value of k that you can calculate from 5% Turb intensity. I am not sure whether it is significant or nor, but i think its better to use appropriate value nevertheless. Code: ``` inlet { type turbulentIntensityKineticEnergyInlet; intensity 0.05; value uniform 60; }```
Hi, do you know how to calculate the initial value? here you make the initial value to be "uniform 60"

 October 26, 2015, 09:58 #44 Member   Vineet Bhola Join Date: Jun 2015 Location: Chemnitz, Germany Posts: 49 Rep Power: 4 If you know approximate values of average velocity OR some Initial guess/rough calculations, you can use the formulae below for k and Epsilon. http://www.cfd-online.com/Wiki/Turbu...ary_conditions Hope that helps. Vineet

 October 26, 2015, 10:23 Thanks a lot #45 New Member   Fei Join Date: Oct 2015 Posts: 13 Rep Power: 4 Thanks a lot, that helps!

 Tags boundary conditions, eps, epsilon, initiallisation, turbulence

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