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Old   June 5, 2001, 08:35
Default Porous Media
  #1
Isa
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Hi!

How does Fluent 5 deal with flow through porous media? I am worried that when I set up a porous zone, Fluent only sets resistances which I can relate from the Ergun equations, but not the true porosity.

I have chemical reactions so I need the superficial velocity to be taken into account.

Can anybody help me please?
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Old   June 12, 2001, 06:14
Default Re: Porous Media
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Isa
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Hi again!

As nobody has answered me, does that mean I cannot do what I wish to do?

Can somebody from Fluent help me?

Isa
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Old   June 12, 2001, 12:27
Default Re: Porous Media
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Newbie
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I don't fully your question but this topic has been already discused in this forum, please search for answers.

Anyway, fluent accounts for the porous media by using a sink term as you suggests so, the liquid never "touches" the solid and the velocity is constant and you cannot model the liquid-solid drag forces.

You can approximate by using

vinst=vsup/epsilon ( vinst=interstitial velocity, vsup=superficial velocity, epsilon=porosity)

If you want to account for other phenomena aside the porosity you must use another approach such as some modification of the kozeni-carman equation if you are in the laminar regime.

cheers.

Newbie
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