Turbulence intensity

amine hero · October 10, 2015, 12:09

hi i am doing the simulation for a axisymmetricjet impingement heat transfer on flat plate, different nozzele to plate and reynolds number testing but
how calculate the I (turbulent intensty %) for this case ( impinging jet)
formule or correlation for calcul the I% please

thanks .

dale154 · October 12, 2015, 05:45

The ANSYS user manual has the equations listed for turbulence properties.
You can get the user manual by pressing F1 when Fluent is open, then just search 'turbulence intensity'
The Theory manual gives a bit more in-depth description if you want it.

ludosbiz · October 13, 2015, 11:26

https://www.sharcnet.ca/Software/Flu...ug/node217.htm
or
http://www.esi-cfd.com/faq/index.php...156&artlang=en

Eakarach · October 13, 2015, 13:10

Dear amine hero

The turbulence intensity can be roughly estimated by considering the flow situation as the following:
1. Grid turbulence - intensity = approximate 1%
2. Wall bound flow - intensity = approximate 10%
3. Free shear flow (jet, wake, and mixing layer) - intensity = >10%

Good luck
Eakarach B.

amine hero · October 13, 2015, 15:28

thank you I=0.16Re**(-1/8)

Eakarach · October 15, 2015, 01:12

I=0.16Re^(-1/8) is developed by considering the fully developed flow in pipe. However, that formula can also employ to estimate the turbulence intensity in many flow situations.

Good luck.

October 10, 2015, 12:09	Turbulence intensity	#1
amine hero New Member amine heroual Join Date: Oct 2015 Posts: 4 Rep Power: 12	hi i am doing the simulation for a axisymmetricjet impingement heat transfer on flat plate, different nozzele to plate and reynolds number testing but how calculate the I (turbulent intensty %) for this case ( impinging jet) formule or correlation for calcul the I% please thanks .

October 13, 2015, 11:26		#3
ludosbiz New Member Ludo Join Date: Jul 2015 Posts: 14 Rep Power: 12	https://www.sharcnet.ca/Software/Flu...ug/node217.htm or http://www.esi-cfd.com/faq/index.php...156&artlang=en dale154 likes this.

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October 12, 2015, 05:45		#2
dale154 New Member Join Date: Aug 2015 Posts: 22 Rep Power: 12	The ANSYS user manual has the equations listed for turbulence properties. You can get the user manual by pressing F1 when Fluent is open, then just search 'turbulence intensity' The Theory manual gives a bit more in-depth description if you want it.

October 13, 2015, 13:10		#4
Eakarach Member Join Date: Aug 2013 Location: Bangkok Posts: 32 Rep Power: 14	Dear amine hero The turbulence intensity can be roughly estimated by considering the flow situation as the following: 1. Grid turbulence - intensity = approximate 1% 2. Wall bound flow - intensity = approximate 10% 3. Free shear flow (jet, wake, and mixing layer) - intensity = >10% Good luck Eakarach B.

October 13, 2015, 15:28		#5
amine hero New Member amine heroual Join Date: Oct 2015 Posts: 4 Rep Power: 12	thank you I=0.16Re**(-1/8)

October 15, 2015, 01:12		#6
Eakarach Member Join Date: Aug 2013 Location: Bangkok Posts: 32 Rep Power: 14	I=0.16Re^(-1/8) is developed by considering the fully developed flow in pipe. However, that formula can also employ to estimate the turbulence intensity in many flow situations. Good luck.