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kpsudhakar June 3, 2010 07:18

Fully Developed Flow
 
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

bharath June 5, 2010 22:51

In easy way you can do it by extending the inlet to half or use the expressions to achieve it

ghorrocks June 6, 2010 07:20

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.

kpsudhakar June 7, 2010 05:09

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.

ghorrocks June 7, 2010 07:03

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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