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-   -   Analyzing Convection vs. Diffusion (http://www.cfd-online.com/Forums/cd-adapco/56522-analyzing-convection-vs-diffusion.html)

Emmanuel Resch March 17, 2008 15:03

Analyzing Convection vs. Diffusion
 
Does anyone know of a practical way to "turn off" the convective flux and just have diffusive transport? Effectively I'd like to run a diffusion-only model...

Thanks Emmanuel

Pauli March 17, 2008 23:02

Re: Analyzing Convection vs. Diffusion
 
Turn off the solution of momentum terms.

Peter Specht March 25, 2008 15:35

Re: Analyzing Convection vs. Diffusion
 
strange idea?! Diffusion is one term inside the momentum equations of Navier-Stokes. No momentum: no convection, but also no diffusion.

Peter

Richard March 27, 2008 15:55

Re: Analyzing Convection vs. Diffusion
 
Do you want to deactivate convection in all equations, or just one? There isn't a built-in general way to do it for all equations, but for scalars you can choose the "diffusion" transport method. If you were ambitious you could perhaps build on this to get diffusion-only solutions for all equations, but that's very hard.


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