Does Turbulence kinetic energy change by the hydraulic diameter at constant Re ?

emreegulr · December 12, 2021, 10:03

Hello, i study on a constant re=100.000, and my two model has a wide difference on TKE. M1 has 1m hydraulic diameter while M2 model has 0.2m. At constant RE for both of them. Waiting for your helps. Thank you.

LuckyTran · December 13, 2021, 03:07

Indeed turbulent kinetic energy is a dimensional quantity. Your velocity and length scale are different for both cases so of course the tke will change correspondingly.

The typical normalization for tke is scaling it by the velocity scale, which gives you turbulence intensity.

December 12, 2021, 10:03	Does Turbulence kinetic energy change by the hydraulic diameter at constant Re ?	#1
emreegulr New Member Emre Join Date: Dec 2018 Posts: 2 Rep Power: 0	Hello, i study on a constant re=100.000, and my two model has a wide difference on TKE. M1 has 1m hydraulic diameter while M2 model has 0.2m. At constant RE for both of them. Waiting for your helps. Thank you.

December 13, 2021, 03:07		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,668 Rep Power: 65	Indeed turbulent kinetic energy is a dimensional quantity. Your velocity and length scale are different for both cases so of course the tke will change correspondingly. The typical normalization for tke is scaling it by the velocity scale, which gives you turbulence intensity. arashjkh likes this.

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