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convective boundary condition

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Old   May 6, 2009, 00:45
Default convective boundary condition
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Dear Sir,
For problems like flow over a cylinder convective boundary conditions are used (d phi)/dt + umax (d phi)/dx = 0 where phi = u or v.
What is the physical meaning of this equation and does it differ from fully developed boundary condition like d phi/dx=0.
Thank you
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