February 17, 2021 at 1:23 pmscholarSubscriberHello everyone,nI am using Fluent 2020R1 for modeling the gasification process. I am using the laminar model for homogenous reaction, where the information of activation energy, Arrhenius rate constant, temperature exponent, reactants, and products stoichiometric coefficients information is given as input.nThe fluent returned rate (only homogenous reaction) and that calculated using custom field function do not match. nThere is two orders of magnitude of difference between the rates. On the other hand, the hand-calculated rate (using excel) by using the concentration returned by fluent and that calculated using CFF matches very well.nDid anyone face such an issue? Where the rates do not match with the one calculated using CFF or UDF? Or am I missing something here?nAny suggestion will be of great help.nThank youn
February 17, 2021 at 4:00 pmRobAnsys EmployeeAre you out by exactly two orders of magnitude? n
February 17, 2021 at 4:20 pmscholarSubscriberHi Rob,nThere is a difference in values as well. nThe excel file with detailed calculation is enclosed which has the information of hand-calculated, cff, and fluent returned rates.nn
February 18, 2021 at 5:19 pmRobAnsys EmployeeI'm not allowed to open that: check the rules section on here. nIf you're seeing a real difference you then need to work through the maths and definitions of the macros and terms in the CFF, UDF etc. Everything should check out, so it's likely a maths error. Remember that UDFs use SI units regardless of what you're using in the model. n
February 27, 2021 at 10:50 amscholarSubscriberHi Rob,nI set last species as N2. Now the rates are matching.nThank you for your suggestions and time.n
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