Help with RSM convergence

June 5, 2004, 06:04

i am modelling a stirred tank using the RSM and can't get my residuals to go down. i haven't changed the default underrelaxation factors and i am using a very fine mesh-2million cells. Any suggestions are welcome.

June 10, 2004, 03:27

The following work for me: Pressure 0.3, Density 1.0, BF 0.5, Momentum 0.7, Turb KE 0.4, Turb Diss rate 0.4, Turb Viscosity 0.4, Re Stresses 0.5.

Curious to know why you're using the RSM. Isn't this overkill? I find the 2 equation models (e.g. realizable k-e) produce just as good answers in less time. Happy to discuss if you want to email me (johnnyb@toffeemail.co.uk)

June 5, 2004, 06:04	Help with RSM convergence	#1
alice Guest Posts: n/a	i am modelling a stirred tank using the RSM and can't get my residuals to go down. i haven't changed the default underrelaxation factors and i am using a very fine mesh-2million cells. Any suggestions are welcome.

June 10, 2004, 03:27	Re: Help with RSM convergence	#2
Johnny B Guest Posts: n/a	The following work for me: Pressure 0.3, Density 1.0, BF 0.5, Momentum 0.7, Turb KE 0.4, Turb Diss rate 0.4, Turb Viscosity 0.4, Re Stresses 0.5. Curious to know why you're using the RSM. Isn't this overkill? I find the 2 equation models (e.g. realizable k-e) produce just as good answers in less time. Happy to discuss if you want to email me (johnnyb@toffeemail.co.uk)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Convergence	Centurion2011	FLUENT	48	June 14, 2022 23:29
RSM convergence	mcarpe	OpenFOAM Running, Solving & CFD	5	May 31, 2018 09:53
Force can not converge	colopolo	CFX	13	October 4, 2011 22:03
Convergence of CFX field in FSI analysis	nasdak	CFX	2	June 29, 2009 01:17
RSM convergence	khar	FLUENT	1	May 11, 2008 15:50