# initial condition for k and epsilon for frozen rotor case.

 Register Blogs Members List Search Today's Posts Mark Forums Read

 June 6, 2014, 12:19 initial condition for k and epsilon for frozen rotor case. #1 Senior Member   M. C. Join Date: May 2013 Location: Italy Posts: 152 Rep Power: 5 Hi all, I'm trying to simulate a fan inside channel, using MRF source terms and simpleFoam. I'm looking for help how to calculate values of k and epsilon for a wall bounded flow of such type of case. I look into literature, but I was able to find correlation only for free-stream flows, or bounded flows with constant section. One thing I have doubt is: in my case, I have many sections for each channel, and I don't have a free stream velocity as it changes according to section's change. How can I set proper initial condition for k and epsilon? I'm a bit confused and I would like to have a little help to clarify myself. Thanks a lot.

 June 12, 2014, 05:38 #2 New Member   Thomas Join Date: May 2014 Posts: 12 Rep Power: 4 Hi, Im not sure if my answer is what you are looking for. I think i would first calculate the values with the "ordinary" formula for k and epsilon: k=1.5*(U*I_U)^2 epsilon=(0.09^(0.75)*k^(1.5))/(L_t) L_t=L_U*L You can try to change I_U (turbulence intensity). Im sure there is a description in the wiki here as well. Regards Thomas

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post mbcx4jc2 OpenFOAM Running, Solving & CFD 12 August 4, 2015 02:20 crst15 OpenFOAM Running, Solving & CFD 9 December 14, 2014 19:17 hfs OpenFOAM Running, Solving & CFD 3 October 29, 2013 09:35 sivakumar OpenFOAM Running, Solving & CFD 7 March 17, 2013 07:37 jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24

All times are GMT -4. The time now is 18:24.