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-   -   Evaluating the pressure drop across complex Porous Media (https://www.cfd-online.com/Forums/main/202952-evaluating-pressure-drop-across-complex-porous-media.html)

gsabhishek June 12, 2018 18:23

Evaluating the pressure drop across complex Porous Media
 
Hi All,

I have a complex rigid solid structure in a channel with low Re(<10) incompressible flow. I intend to find out the the pressure drop across the solid. The domain is shown below :


https://www.dropbox.com/s/ug6t0eoeh2...omain.png?dl=0here



https://www.dropbox.com/s/ug6t0eoeh2...omain.png?dl=0This being a low Re flow we can apply a darcy type flow relation to evaluate the pressure drop. But unfortunately, the solid body is complex and evolving... so estimating its porosity/permeability is quite difficult.
https://www.dropbox.com/s/ug6t0eoeh2...omain.png?dl=0
I intend to use the N-S equation as follows :
\frac{\partial V}{\partial t} + (V.\nabla)V = -\frac{\nabla p}{\rho} + \eta\nabla^2V + g + \alpha10^6 V
here the last term makes the flow zero on the surface and inside the solid. The domain is initialized such that \alpha=0 for liquid and \alpha=1 for solid.

Solid Structure and fluid flow are not coupled. The sequence is as follows
1) The solid structure evolves (very slow)
2) I solve the navier stokes everywhere in the domain untill steady state
3) Next evolution step for solid and repeat with step 2

Could you please help me with understanding the following :
> Is the current form of the equation capturing the physics of the problem. If not how should I approach it
> I might have capillary effects in some regions. How do I handle them
> I intend to use OpenFoam for solving this. What would be a good validation case

thanks for your time.

Utkan November 27, 2020 18:51

How did you solve your problem?

aerosayan November 28, 2020 04:33

Quote:

Originally Posted by gsabhishek (Post 695689)


I don't know the solution to your problem. I wanted to let you know that your link is broken and the dropbox file seems to be deleted.


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