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

jmjohansen · June 20, 2014, 07:12

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, 12:29

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, 12:49

Hello!

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

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June 20, 2014, 12:29		#2
Sun Senior Member Join Date: Nov 2010 Posts: 103 Rep Power: 16	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, 12:49		#3
enayath Senior Member Joe Join Date: Feb 2012 Location: Canada Posts: 112 Rep Power: 14	Hello! You may need to make sure that you have a good mesh. (skewness, orthogonality, boundary layers)