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Old   June 7, 2011, 10:57
Default turbulent flow
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hi everyone
i want to know when a turbulent flow becomes fully development turbulent flow in channels ?
can you help me ?
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Old   June 7, 2011, 11:55
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The same way you tell a flow is fully developed in real life: when the cross channel velocity profile stops changing as you move down the channel. You'll either need to sample the velocity field at different channel lengths and compare them.
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Old   June 7, 2011, 14:28
Default Hi macro
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Hi macro
1-i read in a paper , at 30-35 times hydrolic diameter in a channel and after a time , the turbulent flow becomes fully developed , am i wrong ?
2-how can i show diagram velocity ?
3-i dont understand what you say , what time after run 5,10 or 20 or 30 or more seconds ?
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