parametric study

Discusses use of COCO, the process simulation and modelling software suite from AmsterCHEM, downloadable from http://www.cocosimulator.org

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parametric study

Postby thubelihle » 09 May 2022, 12:38

Hi.
l varied number of stages as input, and reflux ratio as the output in the parametric study; however for stages 26 the feed stage downwards to stage 2, top stage failed to converge. However if l input manually 15 stages as an example the simulation converges; is there a bug in the parametric study? Your help is much appreciated.
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thubelihle
 
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Re: parametric study

Postby jasper » 10 May 2022, 06:02

If I switch back and forth between 25 and 26 stages, the column indeed does not converge.
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Re: parametric study

Postby thubelihle » 10 May 2022, 08:35

Just wondering is it a bug. I managed to vary the feed stages from top stage to bottom stage with no problem at all?
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Re: parametric study

Postby jasper » 10 May 2022, 13:21

It fails because the feed is at stage 26.
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Re: parametric study

Postby thubelihle » 11 May 2022, 02:41

Oh l see. So it doesn't vary the feed stage as the number ofstages are varied proportionality?
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Re: parametric study

Postby jasper » 11 May 2022, 06:20

The parametric study is not aware of what the meaning is of the parameters that it is changing.

The column does indeed not update feed stage if you change the column size. As these are integer parameters, I am also not sure how you would envision this. Proportionality assumes real numbers.
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