Whats the problem with k-epsilon model?

sanjay · May 19, 2011, 03:31

I have simulated a high performance unmanned air craft and compared the results with windtunnel results. the drag is matching but the lift is not. i have used k-epsilon turbulence modeling. CFD is under predicting the lift. can any one say why?

alastormoody11 · May 20, 2011, 06:21

Please provide some additional details regarding your convergence criterion, whether your simulation is converged, what is the wall treatment you are using, also by how much is your Cl amiss from the windtunnel results.

Have you tried using a finer mesh?

May 19, 2011, 03:31	Whats the problem with k-epsilon model?	#1
sanjay Member aerosapien Join Date: Sep 2010 Posts: 59 Rep Power: 15	I have simulated a high performance unmanned air craft and compared the results with windtunnel results. the drag is matching but the lift is not. i have used k-epsilon turbulence modeling. CFD is under predicting the lift. can any one say why?

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May 20, 2011, 06:21		#2
alastormoody11 Senior Member Join Date: Jun 2009 Posts: 100 Rep Power: 16	Please provide some additional details regarding your convergence criterion, whether your simulation is converged, what is the wall treatment you are using, also by how much is your Cl amiss from the windtunnel results. Have you tried using a finer mesh?