About RNG k-e

January 30, 2000, 05:42

Hallo. In RNG k-e, what is eff. turbulent viscosity? What are its relations with turbulent viscosity and standard viscosity?

Is it true: eff.t.v.= t.v.+s.v.?

There is on web something about RNG?

Thank you very much Giovanni

January 31, 2000, 12:04

Please check out the on-line help or user guide, both of which contain details of the RNG formulation. The user guide also contains references to papers on RNG, which was developed by Professors Yakhot and Orszag.

Yes, it is true that the effective viscosity is the sum of laminar and turbulent viscosities. The equations used to obtain the turbulent viscosity are given in the documentation. However, the exact relation used for the "differential viscosity model" is proprietary to Fluent Inc. and is not published.

I am sure there must be something about RNG on the web, but I can't give you a link.

January 30, 2000, 05:42	About RNG k-e	#1
Giovanni Ieria Guest Posts: n/a	Hallo. In RNG k-e, what is eff. turbulent viscosity? What are its relations with turbulent viscosity and standard viscosity? Is it true: eff.t.v.= t.v.+s.v.? There is on web something about RNG? Thank you very much Giovanni

January 31, 2000, 12:04	Re: About RNG k-e	#2
Paul Malan Guest Posts: n/a	Please check out the on-line help or user guide, both of which contain details of the RNG formulation. The user guide also contains references to papers on RNG, which was developed by Professors Yakhot and Orszag. Yes, it is true that the effective viscosity is the sum of laminar and turbulent viscosities. The equations used to obtain the turbulent viscosity are given in the documentation. However, the exact relation used for the "differential viscosity model" is proprietary to Fluent Inc. and is not published. I am sure there must be something about RNG on the web, but I can't give you a link.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
RNG k-epsilon model implementation	romant	OpenFOAM Running, Solving & CFD	2	June 20, 2018 09:33
why RNG k-e is better & what does RNG really mean?	Bonnie White	FLUENT	1	August 8, 2006 10:14
HELP!! Prandtl numbers in RNG k-e turbulence model	maoasis	FLUENT	0	April 24, 2006 11:51
rng les	zxaar	FLUENT	0	May 18, 2005 02:16
RNG with Schemit number	zwdi	FLUENT	0	August 2, 2004 12:54