|June 21, 2009, 18:16||
Join Date: Apr 2009
Posts: 7Rep Power: 6
My simulation involves species diffusion in a porous bed. There is steady state velocity profile of solvent in the bed, with stagnant zones inside the pores of the solid phase (like an HPLC column). I solve for diffusion + convection in the fluid zone, while only for diffusion in the porous zone. I use the porous zone formulation to define the porous zone.
Do I need to define different diffusion coefficients in the fluid and porous zones? If so, how do write a UDF to define my diffusion coefficient in the porous zone?
How does Fluent calculate porous formulation? Say the porus zone is 65% porous. Does that mean Fluent automatically takes porous zone diffusivity as 65% of fluid zone diffusivity? What if the pores in the porous zone are tortuous? How do I include:
Diffusivity (porous zone) = [ 0.65 * Diffusivity (Fluid zone) ] / [ Tortuosity ]
|Thread||Thread Starter||Forum||Replies||Last Post|
|Moving mesh||Niklas Wikstrom (Wikstrom)||OpenFOAM Running, Solving & CFD||121||March 7, 2013 17:21|
|How to add a UDF to a compiled UDF library||kim||FLUENT||3||October 26, 2011 21:38|
|mass diffusion vs temperature UDF||alex||FLUENT||0||March 5, 2008 11:38|
|I need UDF help.||S.Whitney||FLUENT||0||October 15, 2007 11:29|
|Mass Diffusion via UDF||Ryan||FLUENT||4||February 13, 2003 00:10|