chemical time scale

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 July 16, 2011, 10:33 chemical time scale #1 Member   José Rodrigues Join Date: Jun 2010 Location: IN+/IST Lisbon Posts: 53 Rep Power: 7 Hi, Does anybody knows how OpenFOAM calculates the chemical time scale, tc ? I am deciphering the source code right now, but it would be nice to have somebody else's work to compare with. Any help? Jose

 August 16, 2011, 03:26 #2 Member   Tibo Join Date: Jun 2011 Posts: 68 Rep Power: 6 Hi José, If you´re simply looking for the formula, you´ve got a first answer on slide 16 of the following presentation: http://www.openfoamworkshop.org/6th_...ist_slides.pdf If you´re trying to determine how and where exactly this parameter is computed in OpenFOAM format, I´m afraid I can´t help. I actually looked for it - as I am running simulations with reactingFoam and find the question interesting - but did not quite get it. I guess it would help to have more than just my basic knowledge of C++! I´d be glad to read your findings here in case you got more than that in the meantime. Tibo

 November 19, 2013, 13:03 Chemical time scale in PaSR model #3 New Member   Manuel Join Date: Jan 2013 Posts: 21 Rep Power: 4 Dear all, I have a doubt concerning chemical time scale computation in ChemistryModel class. Mainly I'm referring to the tc() function reported in the following: Code: ``` if (this->chemistry_) { forAll(rho, celli) { scalar rhoi = rho[celli]; scalar Ti = this->thermo().T()[celli]; scalar pi = this->thermo().p()[celli]; scalarField c(nSpecie_); scalar cSum = 0.0; for (label i=0; i& R = reactions_[i]; omega(R, c, Ti, pi, pf, cf, lRef, pr, cr, rRef); forAll(R.rhs(), s) { scalar sr = R.rhs()[s].stoichCoeff; tc[celli] += sr*pf*cf; } } tc[celli] = nReaction*cSum/tc[celli]; } }``` Could anyone explain me in details how this chemical time is computed? Which is the physical expression taken as reference? Are there any literature works concerning the evalutation of this term? I've read a lot of works about PaSR model where they talk about the general overview of this combustion model but in each of them they talk about the need of solving detailed reaction system in order to obtain this time. But I've never found how this has to be done. Thank you. Manuel Last edited by wyldckat; November 19, 2013 at 18:39. Reason: Added [CODE][/CODE]

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