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-   -   mass diffusivity in FLUENT (http://www.cfd-online.com/Forums/fluent/49886-mass-diffusivity-fluent.html)

fadhil majnis November 24, 2008 09:44

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.

shoushibo November 24, 2008 11:30

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)

fadhil majnis November 24, 2008 23:53

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?

shoushibo November 25, 2008 12:00

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.

fadhil majnis November 25, 2008 21:32

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?

shoushibo November 26, 2008 10:12

Re: mass diffusivity in FLUENT
 
it should be in the display/countor/species/lam diff of species n

fadhil November 28, 2008 12:09

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.

shoushibo December 2, 2008 09:57

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.


nishith April 15, 2010 06:15

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....

yc9316 November 5, 2010 10:33

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.


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