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Turbulent intensity in Tecplot

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Old   December 17, 2012, 03:19
Default Turbulent intensity in Tecplot
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nitin bansal
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I am trying to draw Turbulent intensity contours in tech plot.
I have tried it by doing writing equation as

{intensity}=sqrt({Turbulent Kinetic Energy})
{intensity/uavg}=({i}/22.72)


where,
Uavg = average velocity


But not able get correct contour as compared to contours seen in Fluent.


Pls help
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Old   March 4, 2013, 23:20
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You can export solution data of Turbulent intensity in Fluent, then import to Tecplot
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Old   March 5, 2013, 17:16
Post hi dear friend
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to get ur ideal contour u should define a turbulence term in fluent software and it depended on the type of ur problem.
High-turbulence case: High-speed flow inside complex geometries like heat-exchangers and flow inside rotating machinery (turbines and compressors). Typically the turbulence intensity is between 5% and 20%
Medium-turbulence case: Flow in not-so-complex devices like large pipes, ventilation flows etc. or low speed flows (low reynolds number). Typically the turbulence intensity is between 1% and 5%
Low-turbulence case: Flow originating from a fluid that stands still, like external flow across cars, submarines and aircrafts. Very high-quality wind-tunnels can also reach really low turbulence levels. Typically the turbulence intensity is very low, well below 1%.
in simulation often u should enter a percent as turbulence intensity.tell me about ur problem
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Old   March 16, 2013, 00:59
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The right hand side of the first equation should change to
sqrt({Turbulent Kinetic Energy}*2.0/3.0).
It affects the value of TI but the contour should look similar. Also, the r.h.s of the second equation should change to ({intensity}/22.72). Do you happen to have a variable named "i" in your file?


Quote:
Originally Posted by nitinbansal184 View Post
I am trying to draw Turbulent intensity contours in tech plot.
I have tried it by doing writing equation as

{intensity}=sqrt({Turbulent Kinetic Energy})
{intensity/uavg}=({i}/22.72)


where,
Uavg = average velocity


But not able get correct contour as compared to contours seen in Fluent.


Pls help
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