Mod el ling in ter nal com bus tion en gines can be made fol low ing dif fer ent approaches, de pend ing on the type of prob lem to be sim u lated. A die sel com bus tion model has been de vel oped and im ple mented in a full cy cle sim u la tion of a com bustion, model ac counts for tran sient fuel spray evo lu tion, fuel-air mix ing, ig ni tion, com bus tion, and soot pol lut ant for ma tion. The mod els of tur bu lent com bus tion of dif fu sion flame, ap ply to dif fu sion flames, which one

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... meets in in dus try, typ i cally in the die sel en gines par tic u late emis sion rep re sents one of the most del e te ri ous pollut ants gen er ated dur ing die sel com bus tion. Strin gent stan dards on par tic u late emis sion along with spe cific em pha sis on size of emit ted particulates have re sulted in in creased in ter est in fun da men tal un der stand ing of the mech a nisms of soot partic u late for ma tion and ox i da tion in in ter nal com bus tion en gines. A phenomenological nu mer i cal model which can pre dict the par ti cle size dis tri bu tion of the soot emit ted will be very use ful in ex plain ing the above ob served re sults and will also be of use to de velop better par tic u late con trol tech niques. A die sel en gine cho sen for sim u la tion is a ver sion of the Cat er pil lar 3406. We are in ter ested in em ploy ing a stan dard fi nite-vol ume com pu ta tional fluid dy nam ics code, KIVA3V-RELEASE2.