CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   Increasing temperature in species transport (

ssamton February 27, 2012 22:03

Increasing temperature in species transport
Hello, all

I have a question for species transport equation.

when i use a species transport equation, temperature is increasing where species transport region only.

of course i turned off volumetric reaction, just use mixture-template

and no heat generation and heat flux.

inlet temperature is 278K and just fixed temperature 258K at wall.

But, after iteration, maximum temperature is 290K.

please tell me why?


doronzo February 28, 2012 08:27

are you using ideal gas for the mixture density?

ssamton February 28, 2012 21:37

thank you

i use a volume-weighted density.

if i use ideal gas, density is not proper value.

density of species1 is 10 and density of species2 is 100.

but, if i use an ideal gas, density of mixture is below 10.

i think this is not a proper value.

so i use volume-weighted density.

and then, mixture density is good, but temperature is increasing.

All times are GMT -4. The time now is 23:27.