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-   -   Problems with non adiabatic PDF! (http://www.cfd-online.com/Forums/fluent/70215-problems-non-adiabatic-pdf.html)

Christoph_84 November 17, 2009 10:55

Problems with non adiabatic PDF!
 
Hello everybody,

I try to simulate a turbulent diffusion Flame using the Falmelet model. I created the Flamelet field, and modified it, form 616 Flame lets to 72. If I use the adiabatic PDF, I generated a PDF field with 50 Points on Mean mixture fraction, 50 Points in mixture fraction Variance and all 46 Species.
Now I use a non adiabatic PDF with the same Flamelet, I can only create 30 Points on Mean mixture fraction, 30 Points in mixture fraction Variance, 20 enthalpy Points and all 46 Species or Fluent must be closed. The PDF File can’t be lager than about 200 MB. I had the same effect with a adiabatic PDF, but the size of the File was about 1,2 GB. If I set the non adiabatic Flamelet to adiabatic conditions lamda=0, no Radiation… I the Flame get 100 K colder, than in the adiabatic case. The Results are equal to an adiabatic PDF with the same number of Points!

How can I create a non adiabatic PDF with 50/50/50 Points and 46 Spices?


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