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turbulent velocity profile Watch

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    I cant understand that the( in the second picture) logarithmatic law velocity profile is quite accurate for y larger than 30 , but neither velocity profile is accurate in the buffer layer ,, 5 <y<30 . Can someone help to explain it ? How do the author know that it's not accurate for 5 <y<30 ? in the graph , i could only see the range is from (10^0) to (10^4) ,
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