# Fully developed flow profile

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 April 14, 2009, 11:05 Fully developed flow profile #1 New Member   Join Date: Mar 2009 Posts: 3 Rep Power: 8 Hi All, I tried to get the fully developed velocity profile in a uniform diameter pipe. Inlet = Velocity profile Outlet = Static Pressure = 0 The flow mach number is around 0.35, so I included compressiblity in CFX. when I plotted the profile after 40D, 50D from inlet, I dont get the fully developed profile. The velocity keep on increasing. I think it is due to inclusion of compressiblity(Velocity increases to satisfy continuity equation). I dont think it would make so much difference in velocity in real situation. Am I doing any thing wrong? what you think? Thanks

 April 18, 2009, 01:32 #2 Senior Member   N/A Join Date: Mar 2009 Posts: 188 Rep Power: 8 How much does it deviate from fully developed flow profile ? Obviously you cannot expect the exact profile since density changes will cause increase or decrease in the velocity.

 April 19, 2009, 06:55 Fully developed flow profile-compressibility #3 New Member   Join Date: Mar 2009 Posts: 3 Rep Power: 8 Thanks for your reply. I could see a 7% increase in average velocity across area/line @70D from Inlet when compared with fully developed profile with out compressibility.

May 20, 2009, 22:21
#4
Senior Member

Rogerio Jack
Join Date: Mar 2009
Location: Brazil
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Rep Power: 7
Do you have these results from experimental data? I´ve got to validate ANSYS CFX, using only forced convection between plates.
Rogerio.

Quote:
 Originally Posted by icfd Hi All, I tried to get the fully developed velocity profile in a uniform diameter pipe. Inlet = Velocity profile Outlet = Static Pressure = 0 The flow mach number is around 0.35, so I included compressiblity in CFX. when I plotted the profile after 40D, 50D from inlet, I dont get the fully developed profile. The velocity keep on increasing. I think it is due to inclusion of compressiblity(Velocity increases to satisfy continuity equation). I dont think it would make so much difference in velocity in real situation. Am I doing any thing wrong? what you think? Thanks

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