[COMSOL_Users] How do I couple Navier Stokes - Brinkman eq in COMSOL?

[biskuwi]

I need help to couple Navier stokes and Brinkman equations in Comsol. Is there anyone have knowledge about this problem or anyone else have tutorial files about this problem?

[satish kumar raju penmetsa]

Hi,
   you can find Navier stokes-brinkman eq tutorial in comsol documentation. In that documentation go to "chemical engineering module" documentation, you can find the tutorial with the title "coupled free and free porous media flow'.[page 57]. May I know what is your work?
Thank you,Satish



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[John Paul Bir Singh]

What do you mean by coupling between the two. A domain can either be brinmkman media or a pure fluid which follows NS equations. Ofcourse there can be a shared boundary between the two on which you need to satisfy continuity of velocity and stress.

-John





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Sent: Sat, February 13, 2010 1:04:31 PM
Subject: [COMSOL_Users] How do I couple Navier Stokes - Brinkman eq in COMSOL?


I need help to couple Navier stokes and Brinkman equations in Comsol. Is there anyone have knowledge about this problem or anyone else have tutorial files about this problem?

[saconrad01]

As indicated in previous reply, the tutorial is helpful. I presume your
two domains are separated by a boundary. Essentially all it involves is
setting up the boundary conditions that link pressure and velocity
across the boundary. For example, in the Brinkman domain you would set
boundary pressure to the NS pressure variable, and in the NS domain you
would set the velocity to the Brinkman velocity variable (as I recall
from memory, as it's been a while since I set up this kind of problem).

Post by biskuwi
I need help to couple Navier stokes and Brinkman equations in Comsol.

Is there anyone have knowledge about this problem or anyone else have
tutorial files about this problem?

[jmburkewsu]

You don't really have to have two separate physics for the two domains. Instead, define whether the domain is porous or free flow by setting the permeability. By setting a low permeability in the brinkman formulations you describe porous flow. By setting a high permeability (i.e. 1) then the brinkman equations reduce to the navier stokes equations. Using this strategy can simplify problems by reducing the number of variables.

Post by biskuwi
I need help to couple Navier stokes and Brinkman equations in Comsol. Is there anyone have knowledge about this problem or anyone else have tutorial files about this problem?