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Implementation of PaSR model in OpenFOAMHi Foamers
I have a question about PaSR in OF as said in FabianPengKarrlhom PhD thesis "http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/ " in PaSR model the cells are divided into a reacting part, and a non-reacting part. The reacting part is treated like a perfectly stirred reactor, in which all present species are homogeneously mixed and reacted. then reaction rates are computed and multiplied by a factor kappa (which stands for a turbulent mixing effects) the equations in chemistryMoldel.C in "derivatives" function are dp/dt=0 dc[i]/dt=omega{dot}[i] dT/dt=-(Sigma(h[i]*omega{dot}[i]) )/(sigma(X[i]*Cp[i])) these equation are used to evaluate reaction rates but these are not the perfectly stirred reactor governing equations.It seems we have assumption like 1-constant pressure 2-Constant volume 3-adiabatic here, are they true assumptions for the cells?! does any one know thw perfectly stirred reactor governing equations which mentioned in the FabianPengKarrlhom thesis? |

hi ali
as turns "an introduction to combustion" said in computing reaction rate the effects of tempreature variations are stronger than pressure variations, so the constant pressure assumption is acceptable. secondly based on ur equations there is no constant volume assumtion!! those are constant pressure assumption equations. Regards Timaji |

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