turbulent viscosity limited to viscosity ratio of?

mechfloeng · April 15, 2009, 17:10

I'm modeling two-phase mixture, I got error message of:

turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 226857 cells....

Can I get help to solve it?

Thanks

doki · April 16, 2009, 02:19

that is mainly because of the turbulence model you use.
set the appropriate model, and also better approximation of the turbulence parameters in inlet/outlet boundary conditions.

mbgm9mm5 · April 27, 2013, 07:09

Hello

I have been also trying to model the flow over rib roughened passages using a realisable k epsilon model.

I am modelling the flow using periodic boundary conditions as i am modelling a flow which is already fully developed.

what should i do in order to specify my inlet turbulent parameters carefully?
I have used intensity and hydraulic diameter of the duct.

any body's help is highly appreciated.

Far · April 27, 2013, 09:53

is it affecting your solution convergence...

Can you show us pics of mesh please?

Please also post some pics of residuals...

itsme_kit · February 6, 2014, 12:45

Quote:

Originally Posted by Far

is it affecting your solution convergence...

Can you show us pics of mesh please?

Please also post some pics of residuals...

Hi

I got this problem too

However, my convergence seems to be fine

Only the turbulent viscosity is the problem I faced

If velocity is not my interest of research, could I just leave it without further fix?

Cause I only care about temperature field

Hopefully you can help me a little

Thanks

April 15, 2009, 17:10	turbulent viscosity limited to viscosity ratio of?	#1
mechfloeng New Member Howard Join Date: Mar 2009 Posts: 5 Rep Power: 15	I'm modeling two-phase mixture, I got error message of: turbulent viscosity limited to viscosity ratio of 1.000000e+005 in 226857 cells.... Can I get help to solve it? Thanks

April 16, 2009, 02:19		#2
doki Member Join Date: Apr 2009 Posts: 41 Rep Power: 15	that is mainly because of the turbulence model you use. set the appropriate model, and also better approximation of the turbulence parameters in inlet/outlet boundary conditions. Hayder Mohammed likes this.

April 27, 2013, 07:09	Madhur Motwani	#3
mbgm9mm5 New Member Madhur Join Date: Apr 2013 Location: Manchester United Kingdom Posts: 1 Rep Power: 0	Hello I have been also trying to model the flow over rib roughened passages using a realisable k epsilon model. I am modelling the flow using periodic boundary conditions as i am modelling a flow which is already fully developed. what should i do in order to specify my inlet turbulent parameters carefully? I have used intensity and hydraulic diameter of the duct. any body's help is highly appreciated.

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April 27, 2013, 09:53		#4
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,551 Blog Entries: 6 Rep Power: 52	is it affecting your solution convergence... Can you show us pics of mesh please? Please also post some pics of residuals...