RMS Res. is the smaller the best?

Anderson T F

Hi all,

Okay, it sounds a strange question. Of course RMS Res is better if smaller. But I have a question about my ploblem.

The image bellow is the convengerce history of a simulation of mine (steam in the main drum of a industrial boiler).

After around 200iteractions the RMS Res value reaches its minimum. After that, the value rises again and even after more than 2000 iterations, the low level of this first valley is not reached anymore. (turbulence Res follows the same trend).

Normally I would expect a value of RMS REs decreasing (with noise, of course) till a certain level and than resting there. Not rising again and resting on a higher level.

What is going on? is my simulation not converged? and where should I stop it and get the results? around 200 iterations with the minimum of RSM Res or after 2000 iterations, with high Res but probably closer to a fully converged result?

Thanks in advance

Anderson



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