Turbulent dissipation residual is cut-off at 5e-1

jmjohansen · June 20, 2014, 06:12

I'm running a 2D axisymmetric swirl DPM combustion model and I just ran into a problem, that I have not seen before.

Using the k-epsilon the value for the residual for the turbulent dissipitation is cut off at 4.9992e-01. The TUI does not report any parameters being limited.

I have en closed a screen cap of the residual plot.

Inputs on ideas or solutions are all very welcome.

Thanks in advance,

Joakim

Sun · June 20, 2014, 11:29

Right off the top of my head and it might not be necessarily useful, run the simulation without solving the turbulence and see if the residuals show something weird and after a while enable the equation for the turbulence and see how it goes.
Cheers!

enayath · June 23, 2014, 11:49

Hello!

You may need to make sure that you have a good mesh. (skewness, orthogonality, boundary layers)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Cannot run the code properly: very large time step continuity error	crst15	OpenFOAM Running, Solving & CFD	9	December 14, 2014 18:17
Courant-number explodes after a lon while (icoFoam)	Rody-	OpenFOAM Running, Solving & CFD	6	January 29, 2014 04:27
Unstabil Simulation with chtMultiRegionFoam	mbay101	OpenFOAM Running, Solving & CFD	13	December 28, 2013 13:12
pimpleFoam: turbulence->correct(); is not executed when using residualControl	hfs	OpenFOAM Running, Solving & CFD	3	October 29, 2013 08:35
Unknown error	sivakumar	OpenFOAM Pre-Processing	9	September 9, 2008 12:53

June 20, 2014, 11:29		#2
Sun Senior Member Join Date: Nov 2010 Posts: 103 Rep Power: 15	Right off the top of my head and it might not be necessarily useful, run the simulation without solving the turbulence and see if the residuals show something weird and after a while enable the equation for the turbulence and see how it goes. Cheers!

June 23, 2014, 11:49		#3
enayath Senior Member Joe Join Date: Feb 2012 Location: Canada Posts: 111 Rep Power: 14	Hello! You may need to make sure that you have a good mesh. (skewness, orthogonality, boundary layers)