PDF combustion modeling
Hi folks,
why the PDF combustion modeling is limited to incompressible flow only? Is it possible to extend this approach to compressible flows? Thanks Jim 
Re: PDF combustion modeling
because combustion is being done at low mach numbers. snobs

Re: PDF combustion modeling
preconditioning enables compressible codes to deal with not only low mach numbers but also very low Mach number.

Re: PDF combustion modeling
what is meant by preconditioning and how this is done.???
regards sam 
Re: PDF combustion modeling
Sam, Have a look at this link to know what is preconditioning: http://www.math.tau.ac.il/~turkel/precon.html Regards Jim

Re: PDF combustion modeling
your density does not vary with mixture fraction in your pdf model!?

Re: PDF combustion modeling
Donald, let us consider betaPDF model, of course density is function of mixture fraction

Re: PDF combustion modeling
this may be a silly question, but when we are modeling using pdf combustion, i was been told that if we opt for the compressibility effects, after creating pdf table, we can treat that flow as compressible. am i in wrong notion??
can u help me out srini 
Re: PDF combustion modeling
this may be a silly question, but when we are modeling using pdf combustion, i was been told that if we opt for the compressibility effects, after creating pdf table, we can treat that flow as compressible. am i in wrong notion??, my mach numbers at the in the total combustion zone vary upto 0.34
can u help me out srini 
hello:
I'm new in fluent,recentlly I got a work to complete a combustion simulation with fluent,but I do not have enough references and books to teach me how to finish it. could you pleasd sent some initial toturials to me.thank you very much! my Email:yubaibai88@163.com 
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