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-   -   PDF combustion modeling (https://www.cfd-online.com/Forums/fluent/43197-pdf-combustion-modeling.html)

 Jim Clancy December 24, 2006 18:49

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

 ejaz December 26, 2006 06:16

Re: PDF combustion modeling

because combustion is being done at low mach numbers. snobs

 Jim Clancy December 26, 2006 12:19

Re: PDF combustion modeling

preconditioning enables compressible codes to deal with not only low mach numbers but also very low Mach number.

 sam December 27, 2006 14:57

Re: PDF combustion modeling

what is meant by preconditioning and how this is done.???

regards sam

 Jim Clancy December 27, 2006 21:10

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

 Donald December 29, 2006 16:30

Re: PDF combustion modeling

your density does not vary with mixture fraction in your pdf model!?

 Jim Clancy December 29, 2006 21:23

Re: PDF combustion modeling

Donald, let us consider beta-PDF model, of course density is function of mixture fraction

 srini January 10, 2007 04:46

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

 srini January 10, 2007 04:47

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

 yubaibai88 March 6, 2010 21:56

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 E-mail:yubaibai88@163.com

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