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CAPE-OPEN Discussions about use and implementation of the CAPE-OPEN standard 2022-11-30T06:50:28+00:00 http://cape-open-forum.org/feed.php?f=5&t=759 2022-11-30T06:50:28+00:00 2022-11-30T06:50:28+00:00 http://cape-open-forum.org/viewtopic.php?t=759&p=2745#p2745 <![CDATA[Re: Heterogeneous Reaction PFR Bug]]> Statistics: Posted by antoinetonee — 30 November 2022, 06:50

]]> 2022-11-01T09:59:46+00:00 2022-11-01T09:59:46+00:00 http://cape-open-forum.org/viewtopic.php?t=759&p=2744#p2744 <![CDATA[Re: Heterogeneous Reaction PFR Bug]]>
Screenshot 2022-11-01 103957.jpg

Your integration fails and pushes values to NaN, which is CAPE-OPEN-ese for numbers are not available. At first glance, I suspect your problem is 0^-0.5 for X["Carbon monoxide"] dropping to zero. Zero to the power of a positive number is defined, but zero to the power of a negative number is not.

Statistics: Posted by jasper — 01 November 2022, 09:59

]]> 2022-10-31T07:05:37+00:00 2022-10-31T07:05:37+00:00 http://cape-open-forum.org/viewtopic.php?t=759&p=2743#p2743 <![CDATA[Heterogeneous Reaction PFR Bug]]>
I'm encountering a persistent problem in the simulation of heterogeneous reaction in PFR. The simulation file is attached. Similar to that in a , I put max(0,X("component name")) to avoid the value in question from getting below zero. Instead, the simulation gives error message as follows:

Unit "PFR_NTA": calculate failed for unit PFR_NTA: Failed to obtain reactionRate for reaction NTA_N2: Failed to calculate reactionRate: CalcReactionProps failed using property package NTA_NH3: Failed to obtain fraction for phase Vapor: no values set for fraction, phase Vapor

What's wrong with my simulation? Why does all the sudden it failed to calculate the fraction (the reactions are entirely in vapor phase, so I suppose this error shouldn't be there in the first place)? Thanks in advance.

Statistics: Posted by antoinetonee — 31 October 2022, 07:05

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