scale model of a a tube

ozalzi · July 29, 2018, 13:27

Hi,
Im working on a CFD 3D model of laminar fluid flow along tube with ADINA 9.4.

There is a portion of the tube that i want to model as porous medium in order to mimic the flow resistance of a longer tube, i.e.:
1 meter of laminar flow inside rigid tube will be scaled down to 10 centimeter of porous media.

The parameters requested by the ADINA that i have trouble to properly calculate are the porosity and permeability of the material.

any ideas? other solution methods may help too.
thanks,
Oren

LuckyTran · August 3, 2018, 17:11

What's more important is the Darcy-Forchheimer coefficients. The porosity and permeability do not affect the pressure drop in the theory of LIH porous media. But, what often happens is that there is a correlation for the Darcy and Forchheimer coefficients based on permeability (usually a correlation based on packed beds). Maybe you only have the Darcy term and no Forchheimer term.

I'm clueless about ADINA but you have to dig around to figure out how exactly it calculates the pressure drop.

July 29, 2018, 13:27	scale model of a a tube	#1
ozalzi New Member Join Date: Jul 2018 Posts: 1 Rep Power: 0	Hi, Im working on a CFD 3D model of laminar fluid flow along tube with ADINA 9.4. There is a portion of the tube that i want to model as porous medium in order to mimic the flow resistance of a longer tube, i.e.: 1 meter of laminar flow inside rigid tube will be scaled down to 10 centimeter of porous media. The parameters requested by the ADINA that i have trouble to properly calculate are the porosity and permeability of the material. any ideas? other solution methods may help too. thanks, Oren

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August 3, 2018, 17:11		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,762 Rep Power: 66	What's more important is the Darcy-Forchheimer coefficients. The porosity and permeability do not affect the pressure drop in the theory of LIH porous media. But, what often happens is that there is a correlation for the Darcy and Forchheimer coefficients based on permeability (usually a correlation based on packed beds). Maybe you only have the Darcy term and no Forchheimer term. I'm clueless about ADINA but you have to dig around to figure out how exactly it calculates the pressure drop.