mass diffusivity in FLUENT
 

Hello, I need to determine the mass diffusivity in FLUENT. Can I get the diffusivity value directly in FLUENT or I need to write down UDF in order to get the diffusivity value?

Thanks.

Re: mass diffusivity in FLUENT
 

mass diffusivity in fluent is determined in material panel. or you will get the value in display>countors> Lam Diff Coef of species-n (in the Species... category)

Re: mass diffusivity in FLUENT
 

hye, thanks to Shoushibo. I cannot find the Lam Diff Coef of species-n in the display window. I need to define something or what? I need to enable any model in define model?

Re: mass diffusivity in FLUENT
 

do you activate the species model? if no ,you need. do you want to simulate a species transport in the mixture? in the material panel , there is a item about mass diffusivity. you may check it. good luck.

Re: mass diffusivity in FLUENT
 

thanks shoushibo. Actually Im simulate a species transport for mixture in the Eulerian model. Im already found the mass diffusivity item in the material panel. What I want now is the mass diffusivity after certain time step of simulation. How can I get the mass diffusivity value for that?

Re: mass diffusivity in FLUENT
 

it should be in the display/countor/species/lam diff of species n

Re: mass diffusivity in FLUENT
 

hi Shoushibo, I still cannot find the lam diff of species n as what you said. Im using Fluent 6.3. In the species model, I enable the species transport also the options diffusion energy sorce and full multicomponent diffusion. Is that I missing something in define the species and transport model? Thanks.

Re: mass diffusivity in FLUENT
 

you can try to disable the full multicomponent,and see the results. i solve the binary diffusion in the speices model.

hi me too facing the same problem...... i am defining two phases. where i want to include mass diffusivity... but i am not getting how to find out this mass diffusivity panel.... every where it is written ...that it is in the materials panel..... but i could not found ..... please throw some light....

just as the way given by shoushibo, display/countor/species(not properties)/lam diff of species n is the way to display laminer mass diffusive, my fluent version is Ansys 12. Refer to mass diffusive in materials panel, it is in mixture(material type) only. good luck.

diffusivity
 

Hai Iam also facing the similar problem but I want to know the fluent computed value after 1000 iterations, not how to specifiy at inlet