Learning Forum

[felice_lucivero]

Hello everybody,

I am running a 2D simulation in Fluent, but I am facing some troubles with convergence.

I would like to plot the residuals contours to spot where the problem is.

There exists any way to do this?

[Rob]

You can't plot the residuals (good idea though). Mass balance is available in the contour plots, focus more on the high/low parts of the scale over the values. 

Depending on what is causing the problems I also suggest looking at velocity and temperature contour plots with node values on and then off. You're looking for badly resolved gradients. 

How are the monitors looking?

[felice_lucivero]

Hello Rob,

where can I find the mass balance in the contour plots?

Here is a close up of the highest temperture gradients within the domain:

Here is the velocity contour plot:

Just to give you an idea.

Thank you

[Rob]

In the Residuals bit, Mass Imbalance, so I was nearly right. 

Looking at the images I'd focus attention on the blue "lines" in the top image and green-ish line in the lower: there's an obvious streak in the results.