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Old   February 19, 2001, 09:46
Default fluent in diffusion simulation
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appleyy
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I am doing some research about gas diffusion.Is it possible to simulate gas diffusion using fluent?If it can ,are there any difference between diffusion simulation and flow simulation? thank you for help.
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Old   February 19, 2001, 22:12
Default Re: fluent in diffusion simulation
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Greg Perkins
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Assuming you assume a continuum approach, I'm pretty sure this is possible - in essence you just ensure no convection in the domain and then all changes in concentration will be governed by diffusion. I haven't tried it with zero convection, but with very low values of the velocity inlets, I have (accidently in my case) generated solutions which are diffusion dominated.

Accuracy? not sure.

Greg
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Old   February 19, 2001, 22:48
Default Re: fluent in diffusion simulation
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appleyy
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thank you very much.Your answer gives me confidence in continuing my research.Because I am a beginner in CFD,espeacially in flunet,I am very glad to have your help. I have another question:which model may I chose in simulation,k-e model or spart-alpla model or big turbo simulation model or some others? How can these model present the charactristic of diffusion? thanks a lot.
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Old   February 19, 2001, 23:01
Default Re: fluent in diffusion simulation
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Greg Perkins
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These models are for modelling turbulence. If you only want to model diffusion, you should choose a laminar flow, turn on species, define your material/species properties and importantly define you mass diffusivitity (m2/s) - this will determine the rates of diffusion of the various gas species in your domain.

I suggest you do some reading on cfd and fluid mechanics - convection, diffusion and turbulence.

Greg
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