[sarodesr]

Hi,

Can anybody explain me contains of pdf file . I am interested in furnace simulation using pdf approach. I went through all fluent manual but couldn't find this. Also I will appreciate if you also tell me work flow of pdf approach.

regards,
Sarang

[diamondx]

The PDF , probability density function is a table that store the fluctuation of f (the mixture fraction), scalars that depends on the mixture fraction. from there Fluent will derive scalars like temperature , velocity, and mass fraction of species

[sarodesr]

Hi Ghazlani,

Thank you for reply. I understood what does PDF funnction do but I really dont understand how it does? If I look into fluent pdf file it looks like this-

(0 "Fluent15.0")

(0 "PDF Variables:")
(100 (101)(
(pdf/includeequil? #t )
(pdf/frozenboundary? #t )
(pdf/multi? #t )
(pdf/adiabatic? #f )
(pdf/chemistry 0)
(pdf/empirialfuel? #f )
(pdf/empirialscnd? #f )
(pdf/parpremix #t )
(pdf/numspecies 20)
(pdf/initpressure 101325.000000)
(pdf/mintemp 298.000000)
(pdf/maxtempratio 1.000000)
(pdf/tloss 0.667000)
(pdf/tadd 0.250000)
(pdf/max-species 20)
(pdf/num-include-species 0)
(pdf/num-exclude-species 17)
(pdf/mole-or-mass? #f )
(pdf/exclude-species NO NO2 N2O H2O(L) N NH NH2 NH3 NNH HCN HNO CN H2CN HCNN HCNO HOCN HNCO )
(pdf/include-species )
(pdf/stream1temp 303.149994)
(pdf/stream2temp 323.149994)
(pdf/stream3temp 324.149994)
(pdf/numf1point 31)
(pdf/numf2point 21)
(pdf/richlimit1 0.100000)
(pdf/richlimit2 0.100000)
(pdf/numfvpoint 19)
(pdf/numstream 3)
(pdf/empshfuel 50000000.000000)
(pdf/empcpfuel 1000.000000)
(pdf/empshscnd 50000000.000000)
(pdf/empcpscnd 1000.000000)
(pdf/numenthalpy 41)
(pdf/nne/cold 30)
(pdf/nne/hot 11)
(pdf/multi-tabulation #f )
))

(0 "Species Input Data:")
(100 (102 20)(
ch4
h2
n2
o2
c6h14
c5h12
co2
h2o
h2s
co
c4h10
c3h8
c2h6
cs2
s
c<s>
oh
h
o
c2h2
))

(100 (106 20)(
2.749000e-01
2.047000e-01
7.000000e-02
0.000000e+00
2.060000e-02
9.700000e-03
6.900000e-03
1.510000e-02
1.000000e-04
2.200000e-03
1.047000e-01
8.730000e-02
2.038000e-01
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
))

(100 (107 20)(
0.000000e+00
0.000000e+00
7.899234e-01
2.100766e-01
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00
0.000000e+00

Can you please tell me how should I interpret these values? I mean which value correspond to which scalar?

regards,
Sarang