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Old   June 3, 2010, 07:18
Default Fully Developed Flow
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Sudhakar P
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Dear CFX users,
Thanks in advance,Could anyone suggest me to obtain the fully developed flow at inlet for a simple pipe cfx simulation without extending the inlet.

I tried out the following steps to achieve the fully developed flow at inlet
1)Performed a simulation specifying flow direction as normal to boundary.
2)Extract the velocity variables at outlet
3)And specify those extracted velocity variables into cartesian components as a Profile boundary at inlet.

Due to software consideration we cant assign zero velocity (Near to the wall) .So i cant achive the fully developed flow condition at inlet.

Thanks
Sudhakar
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Old   June 5, 2010, 22:51
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Bharath kumar
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In easy way you can do it by extending the inlet to half or use the expressions to achieve it
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Old   June 6, 2010, 07:20
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Glenn Horrocks
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Why don't you save your outlet velocity as a CFX profile? Then you can impose that on the inlet as a profile and you have fully developed flow at the inlet.
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Old   June 7, 2010, 05:09
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Sudhakar P
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Thanks Glenn Horrocks
I tried that option ,But the profile export option neglect the near wall velocity variables(Zero Velocity).So its tough to achieve the fully developed flow at inlet.
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Old   June 7, 2010, 07:03
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Glenn Horrocks
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You do not understand the CFX control volumes. The centroid of the first control volume is a distance away from the wall and hence its velocity is non-zero. The profile is correct.
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