Benjamin Franklin & CFD - Cham

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Philadelphia CFD ConferenceGeometric and population grids;what‟s new?April 2010Does CFD recognise the population dimension, perhaps in other words?Yes; the 1971 „eddy-break-up model‟ (EBU) for combustion simulation didso, postulating a two-member population: viz. burned and unburned.The rate of inter-mingling was precisely the engulfment rate.It solved the „Scurlock puzzle‟,viz.why did the turbulent- flameangle vary little with: inlet velocity,fuel-air ratio, temperature, etc.?The EBU is represented on TRI-MIX by red squaresand joining line. Engulfment products burn at once.The EBU model is still in (indirect) use; so theengulfment-rate concept has, with empiricalconstant, been (tacitly) accepted.
Philadelphia CFD ConferenceGeometric and population grids;Other tentative steps into population spaceApril 2010A 1982 ‘two-fluid „model of transition todetonation has shownhow hotter populationelements (right) areaccelerated faster thancolder elements (left).Variants of EBU, namely:• eddy-dissipation concept,• presumed-pdf,• „flamelet‟)have adherents;but none have recognised the need tocalculate the distribution throughoutTRI-MIX space.
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Benjamin Franklin & CFD - Cham

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