Turbulent Viscosity - Floating Point Error

November 20, 2003, 17:26

I am trying to model an unbaffled stirred tank using MRF and the RSM turbulence model. However, after 17 iterations, I get a message "turbulent viscosity limited to viscosity ratio of 1.0e+05 in 1 cells. The number of cells affected then rises with each iteration until iteration 23 when I get the message "turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 2439 cells. Error: Floating point error: overflow".

From other postings on this site I know that this is an issue which many people face. Could someone please give me some advice?

November 26, 2003, 09:42

you can improve the ratio in the solve--control--limits,maybe that can help.

November 20, 2003, 17:26	Turbulent Viscosity - Floating Point Error	#1
Johnny B Guest Posts: n/a	I am trying to model an unbaffled stirred tank using MRF and the RSM turbulence model. However, after 17 iterations, I get a message "turbulent viscosity limited to viscosity ratio of 1.0e+05 in 1 cells. The number of cells affected then rises with each iteration until iteration 23 when I get the message "turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 2439 cells. Error: Floating point error: overflow". From other postings on this site I know that this is an issue which many people face. Could someone please give me some advice?

November 26, 2003, 09:42	Re: Turbulent Viscosity - Floating Point Error	#2
richard Guest Posts: n/a	you can improve the ratio in the solve--control--limits,maybe that can help.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Compile calcMassFlowC	aurore	OpenFOAM Programming & Development	13	March 23, 2018 08:43
How to install CGNS under windows xp?	lzgwhy	Main CFD Forum	1	January 11, 2011 19:44
UDF: DEFINE_CG_MOTION for vertical jump motion of an electrode!	alban	Fluent UDF and Scheme Programming	2	June 8, 2010 19:54
user subroutine error	CFDUSER	CFX	2	December 9, 2006 07:31
user defined function	cfduser	CFX	0	April 29, 2006 11:58