Turbulence intensity dependent from the Re-Number

linch · September 27, 2009, 11:07

Hi everyone,

I have simulated an airflow in a rectangular pipe using k-epsilon model with wall functions enabled (y+ is ok). The Reynolds-Number for the flow is about 13000, thus it has to be turbulent. But being a newbie I have no idea what intensity of turbulence should I get for the fully developed pipe flow with this Re-number. 10%, 30%, 50%? Does anybody have a clue or a reference?

And the same but another question

. Starting from which value of turbulent intensity of a flow it is considered to be turbulent?

harishg · October 2, 2009, 01:21

Did you try looking in Viscous Fluid Flow textbooks? You can try to match the boundary layer thicker. Also since the configuration seems like a benchmark case, you might find some experimental studies on the same.

September 27, 2009, 11:07	Turbulence intensity dependent from the Re-Number	#1
linch Senior Member Illya Shevchuk Join Date: Aug 2009 Location: Darmstadt, Germany Posts: 176 Rep Power: 16	Hi everyone, I have simulated an airflow in a rectangular pipe using k-epsilon model with wall functions enabled (y+ is ok). The Reynolds-Number for the flow is about 13000, thus it has to be turbulent. But being a newbie I have no idea what intensity of turbulence should I get for the fully developed pipe flow with this Re-number. 10%, 30%, 50%? Does anybody have a clue or a reference? And the same but another question . Starting from which value of turbulent intensity of a flow it is considered to be turbulent?

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October 2, 2009, 01:21		#2
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	Did you try looking in Viscous Fluid Flow textbooks? You can try to match the boundary layer thicker. Also since the configuration seems like a benchmark case, you might find some experimental studies on the same.