CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM

k and omega at inlet for k-omega SST

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

LinkBack Thread Tools Display Modes
Old   March 17, 2017, 11:38
Default k and omega at inlet for k-omega SST
New Member
Join Date: Mar 2015
Posts: 6
Rep Power: 4
driu is on a distinguished road
Hello Everyone,

I have just started using OpenFOAM and got into some issues trying to specify identical inlet conditions to ANSYS CFX.

In CFX I was using 'Medium' turbulence, which is 5% intensity and viscosity ratio μ_t/μ equal to 10.

In OpenFOAM I have found a way to specify the Intensity in k using turbulentIntensityKineticEnergyInlet and length scale in omega using turbulentMixingLengthFrequencyInlet. For the length scale I have specified 0.07 x Hydraulic Diameter.

Now this does not give me identical results to CFX. I know this discrepancy is because of k and omega values at the inlet. When I specify k and omega as fixed values, I get identical results in OpenFOAM and in CFX.

So my questions are:

1) Is there a way to specify viscosity ration in OpenFOAM?
2) Is there a way of estimating the length-scale from the viscosity ratio?

Many thanks,
driu is offline   Reply With Quote


Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
At high Y+ values does the K Omega SST model just behave like the K Epsilon model? JuPa CFX 0 December 22, 2015 07:44
how to calculate the omega at inlet boundary in k omega sst Scabbard OpenFOAM Running, Solving & CFD 2 September 30, 2014 13:06
Non-physical flow: omega is fixed at inlet aljazari OpenFOAM Running, Solving & CFD 0 November 15, 2012 12:18
overshooting of Omega in SST komega using simpleFoam cm_jubayer OpenFOAM 1 August 26, 2011 13:18
Boundary Conditions for k omega SST dancfd OpenFOAM Pre-Processing 0 June 9, 2011 23:25

All times are GMT -4. The time now is 23:29.