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#1 |
New Member
Join Date: Mar 2014
Posts: 5
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Can anyone sum up all the differences in actual velocity profile (not the normalized one) when a "log-law" wall condition is applied to if it had been a theoretical laminar or turbulent profile here ?
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#2 |
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Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
Rep Power: 73 ![]() ![]() ![]() |
in the viscous sublayer you get a laminar profile, very different from the log-law as it behaves like u+=y+
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#3 |
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Join Date: Mar 2014
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No. I am talking about y+ <30.....where both laminar and turbulent exist. What I would like to know is how this normalized log-law eqn....u+ = (y+ / k) + c gets plotted in a u v/s. y plot, not u+ v/s. y+......and also if I could get a plot of our well known turbulent and laminar profiles on the same plot, it would be very helpful because I want to compare all the three....for ex:- which one stays up or goes down for how long.....Please assume any relevant value for k and c above to give me this plot ?
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#4 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,830
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Quote:
just assume to know u_tau and the viscosity of the fluid, you can transform the laws (u+,y+) in (u,y)... |
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#5 |
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Yes....sure.Thank you Mr. Denaro
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Tags |
viscous layer, wall boundary condition, wall distance |
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