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Help!! Species Transport-Mass Fraction

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Old   March 12, 2014, 07:23
Default Help!! Species Transport-Mass Fraction
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Prashant Thaker
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HEllo,
anyone familiar with Street canyon problem might be able to help.

I am modeling carbon monoxide dispersion using species transport in Fluent.
I am specifying road surface as a Mass Flow Inlet from which CO is emitted (g/s). I am using Mixture Template (air-CO)
I know the CO emission rate which i specify (g/s)

Here is the question:
As the emission is of CO, I set CO mass fraction as 1.

upon convergence, I get very high conc of CO (10^-4 kmol/m3)
other researchers report this in the range of (10^-8 kmol/m3)

What might be the problem?

Kindly Help,
Prashant Thaker
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mass fractions, species transport, street canyon

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