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-   -   Turbulent intensity in Tecplot (http://www.cfd-online.com/Forums/tecplot/110641-turbulent-intensity-tecplot.html)

 nitinbansal184 December 17, 2012 03:19

Turbulent intensity in Tecplot

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

 LB_James March 4, 2013 23:20

You can export solution data of Turbulent intensity in Fluent, then import to Tecplot

 saeed115 March 5, 2013 17:16

hi dear friend

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
;)

 blackmask March 16, 2013 00:59

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 (Post 397841) 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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