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Old   May 17, 2016, 09:18
Unhappy Please HELP: Postprocessing_LES data
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Kumar
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Dear All,

I need some guidance from experts regarding my post processing of LES simulation. I am studying about BL transition phenomenon, for a simple flat plate geometry at a small incidence. I have done simulation with monitor points(lines) and saved data's for every 50time steps. I used Matlab to see the time averaged results. I herewith attached some plots.

1. CF: Skin friction coefficient for monitor points along the inclied plate in different z direction values. I feel the Cf value is bit weird compare to the Blasius solution for laminar and turbulent. Also, it approaches to zero around 0.52m, which I can say is the region of seperation. My question is is the Cf plot is meaningful? How do I conclude with this for transition?

2. Tavg_rms : Here we can see the flow starts fluctuating around 0.45m. so this is the point where it starts to behave has turbulent flow

3. Tavg_rms_x & xvel : RMS x fluctuation & Velocity along X, is plotted against Tangential direction (Y) at different stream wise direction to see the BL growth.

How can I conclude by saying that there is transition, which occurs in the region. The shear stress plot behaves as same as CF plot and I cant come to conclusion with shear stress or cf plot. what are all other values would give me a meaningful result to justify the transition phenomenon.

I would be more happy if someone could help me out. Looking for your valuable comments.

Kind Regards,
Kumar
Attached Images
File Type: jpg Tavg_rms.jpg (52.8 KB, 5 views)
File Type: jpg Tavg_rms_x.jpg (49.8 KB, 5 views)
File Type: jpg u+.jpg (40.0 KB, 5 views)
File Type: jpg xvel.jpg (43.1 KB, 4 views)
File Type: jpg CF.jpg (42.9 KB, 3 views)
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Old   May 23, 2016, 09:22
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Kumar
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Hi,

someone could you please help me with the problem I am facing?
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boundary layer flow, les, transition

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