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

Re: Analyzing Convection vs. Diffusion
 

Turn off the solution of momentum terms.

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

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.