question about composition PDF transport model

lisa_china · November 22, 2014, 21:25

hello everyone,
recently i am simulating a jet burner with detailed chemical mechanism using PDF transport model. i have tried to use laminar finite rate-relax to chemical equilibrium as an initial solution, then using composition PDF transport to calculate the final result. but after the calculation, i found the velocity magnitude is much larger than the velocity i set, 10 times approximately.
i also have tried using partially premixed model to calculate as the initial solution, finally the velocity still was wrong.
please help me, so kind of you.
thank you in advance!

lisa_china · November 23, 2014, 09:15

please...
is there anyone who knows?

lucar4980 · November 23, 2014, 17:29

There should be something wrong...it cannot be just a modeling error. Check you BC again (Mass flow, temperatures, pressures, etc).

lisa_china · November 23, 2014, 19:59

hi Lucar,
i have checked my boundary conditions for several times, and they are right.
would you prefer to help me for another question?
should the particle velocity magnitude be the same as the velocity magnitude shown in the velocity contour?
thank you very much and hope for your rely.

November 22, 2014, 21:25	question about composition PDF transport model	#1
lisa_china Member Join Date: Oct 2014 Posts: 43 Rep Power: 11	hello everyone, recently i am simulating a jet burner with detailed chemical mechanism using PDF transport model. i have tried to use laminar finite rate-relax to chemical equilibrium as an initial solution, then using composition PDF transport to calculate the final result. but after the calculation, i found the velocity magnitude is much larger than the velocity i set, 10 times approximately. i also have tried using partially premixed model to calculate as the initial solution, finally the velocity still was wrong. please help me, so kind of you. thank you in advance! Last edited by lisa_china; November 23, 2014 at 09:12.

November 23, 2014, 17:29		#3
lucar4980 New Member Join Date: Oct 2012 Location: Italy Posts: 17 Rep Power: 13	There should be something wrong...it cannot be just a modeling error. Check you BC again (Mass flow, temperatures, pressures, etc). __________________ Advanced Mechanical Design CAE solutions specialist numerical.it

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November 23, 2014, 09:15		#2
lisa_china Member Join Date: Oct 2014 Posts: 43 Rep Power: 11	please... is there anyone who knows?

November 23, 2014, 19:59		#4
lisa_china Member Join Date: Oct 2014 Posts: 43 Rep Power: 11	hi Lucar, i have checked my boundary conditions for several times, and they are right. would you prefer to help me for another question? should the particle velocity magnitude be the same as the velocity magnitude shown in the velocity contour? thank you very much and hope for your rely.