K-e model

November 23, 2002, 11:56

Hi ,

For the turbulence model how can we estimate the value of turbulence intensity at the inlet if we don't have experimental data ? i guess this value will help in estimating the value of k and epsilon.

Thanks.

P.S i am CFX5.5.1 user

November 24, 2002, 08:18

Read down in this forum. There are several references to textbooks about turbulence such as Rodi (1980s) who provide explanation to this effect on a case per case basis.

November 25, 2002, 04:09

If the flow is fully developed, the turbulence intensity may be as high as a few percent.

There is a empirical correlation for pipe flows for turbulence intensity:

I=0.16*(Re)**(-1.8)

Best Regards,

KG

November 23, 2002, 11:56	K-e model	#1
swapnil Guest Posts: n/a	Hi , For the turbulence model how can we estimate the value of turbulence intensity at the inlet if we don't have experimental data ? i guess this value will help in estimating the value of k and epsilon. Thanks. P.S i am CFX5.5.1 user

November 24, 2002, 08:18	Re: K-e model	#2
Bob Guest Posts: n/a	Read down in this forum. There are several references to textbooks about turbulence such as Rodi (1980s) who provide explanation to this effect on a case per case basis.

November 25, 2002, 04:09	Re: K-e model	#3
KG Guest Posts: n/a	If the flow is fully developed, the turbulence intensity may be as high as a few percent. There is a empirical correlation for pipe flows for turbulence intensity: I=0.16(Re)*(-1.8) Best Regards, KG

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