Fully developed flow profile

icfd · April 14, 2009, 11:05

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

harishg · April 18, 2009, 01:32

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.

icfd · April 19, 2009, 06:55

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.

rogbrito · May 20, 2009, 22:21

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

April 14, 2009, 11:05	Fully developed flow profile	#1
icfd New Member Join Date: Mar 2009 Posts: 3 Rep Power: 17	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 19, 2009, 06:55	Fully developed flow profile-compressibility	#3
icfd New Member Join Date: Mar 2009 Posts: 3 Rep Power: 17	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.

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April 18, 2009, 01:32		#2
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	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.